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wpmd h 11 00601 / 171010601 magi 3 c power module vdrm C variable step down regulator module w e - online.com wrth elektronik eisos gmbh & co. kg C d ata sheet r ev. 1 . 0 ? september 2017 1 / 54 6 v C 42v / 1 a / 0.8 v C 6v output d escription the vdrm series of the mag i3c power module family provide s a fully integrated dc - dc power supply including the buck switching regulator and inductor in a package. the 171010601 offers high efficiency and delivers up to 1 a of output current. it operates from 6v input voltage up to 42v. it is designed for fast transient response. it is available in an innovative industrial high power density to263 - 7ep (10.16 x 13.77 x 4.57mm) package that enhances thermal performance and allows for hand or machine soldering. the v drm regulators have an integrated protection circuit that guard s against thermal overstress and electrical damage by using t hermal shut - down, overcurrent, short - circuit, overvoltage and undervoltage protection . typical applications ? point - of - load dc - dc applications from 9v, 12v, 18v and 24v industrial rails ? industrial, t est & measurement, m edical applications ? system power supplies ? dsps, fpgas, mcus and mpus supply ? i/o interface power supply typical circuit diagram features ? peak efficiency above 90 % ? current capability up to 1 a ? input voltage range: 6v to 42 v ? output voltage range: 0.8 v to 6v ? reference accuracy: 2% ? no minimum load required ? integrated shielded inductor solution for quick time to market and ease of use ? single exposed pad for best - in - class thermal performance ? low output voltage ripple (< 10 mv pp ) ? adj ustable switching frequency: 0.2 to 0.8 mhz ? low r ipple constan t on - time control ? synchrono u s operation ? automatic power saving operation at light load ? undervoltage lockout protection (uvlo) ? adjustable soft - start ? thermal shutdown ? short circuit protection ? cycle - by - cycle current limit ? output overvoltage protection ? pin compatible with 171 012401, 171012402, 171032401 , 17102 0601 and 171030601 ? opera ting ambient temperature up to 10 5c ? rohs and reach compliant ? operating junction temp. range: - 40 to 125c ? mold compound ul 94 class v0 (flammability testing) certified ? complies with en55022 class b radiated emissions standard r on c in ron vin en pgnd ss fb vout module r fbt r fbb c ss c ff c out agnd 1 2 3 ep 5 4 6 7 v in v out gnd gnd t o 2 6 3 - 7 e p
wpmd h 11 00601 / 171010601 magi 3 c power module vdrm C variable step down regulator module w e - online.com wrth elektronik eisos gmbh & co. kg C d ata sheet r ev. 1 . 0 ? september 2017 2 / 54 package top view bottom view marking description pin description symbol number type description vin 1 power the supply input pin is a terminal for an unregulated input voltage source. it is required to place the input capacitor nearby the vin pin and pgnd. ron 2 input an external resistor from r on to v in pin sets the on - time and frequency of the application. en 3 input connecting this pin to gnd disables the device. connecting this pin to a voltage higher than 1.18v typ. (but <6.5v) or leaving it floating enables the device. this pin can be used in order to set an external uvlo through a resistor divider. if this pin is left floating the device is always on. agnd 4 supply the analog ground pin is the reference point for all stated voltages . it is internally connected to pgnd. ss 5 input for the soft - start function there is an internal 8a current source which charges an external capacitor (c ss ) to generate the soft - start. a minimum capacitance is required fb 6 input the feedback pin is internally connected to the regulation circuitry, the over voltage and short - circuit comparators. the regulation reference point is 0.8v at this input pin. connect the feedback resistor divider between the output and agnd to set the output voltage. vout 7 power the output voltage pin is connected to the internal inductor. for the best stability and operation connect the outpu t capacitor between this pin and pgnd. pgnd ep power exposed pad C main node fo r switch current of the internal low - side mosfet. used as heat sink for power dissipation during operation . marking description we wrth elektronik trade name y year m month llll assembly lot code s assembly site code per qss 050 - 120 g3 lead finish code per jedec norm (green 3 mat sin) magi3c magi3c logo 171010601 order code ron vin en agnd ss fb vout 1 2 3 4 5 6 7 6 7 1 2 3 4 5 6 7 6 7 exposed pad = pgnd ep ron vin en agnd ss fb vout ymllllsg 3 magi 3 c 171010601
wpmd h 11 00601 / 171010601 magi 3 c power module vdrm C variable step down regulator module w e - online.com wrth elektronik eisos gmbh & co. kg C d ata sheet r ev. 1 . 0 ? september 2017 3 / 54 o r dering information order code part description specifications package packaging unit 171010601 wpmd h11 0060 1jt 1 a / 0.8 - 6vout version to263 - 7ep tape and reel, 250 pieces 17801 0601 wpmd h11 006 01jev 1 a / 0.8 - 6vout version eval board 1 pin compatible family members order code part description specifications package packaging unit 1710 12401 wpmd h1102401 jt 1 a / 5 - 24vout version to263 - 7ep tape and reel, 250 pieces 178012401 wpmd h1102401jev 1a / 5 - 24vout version eval board 1 171012402 wpmd h1152401jt 1.5a / 5 - 24vout version to263 - 7ep tape and reel, 250 pieces 178012402 wpmd h1152401jev 1.5a / 5 - 24vout version eval board 1 171032401 wpmd h1302401jt 3a / 5 - 24vout version to263 - 7ep tape and reel, 250 pieces 178032401 wpmd h1302401jev 3a / 5 - 24vout version eval board 1 17102 0601 wpmd h12 00601jt 2 a / 0.8 - 6vout version to263 - 7ep tape and reel, 250 pieces 17802 0601 wpmd h12 00601jev 2 a / 0.8 - 6vout version eval board 1 171030601 wpmd h1300601jt 3 a / 0.8 - 6vout version to263 - 7ep tape and reel, 250 pieces 178030601 wpmd h13006 01jev 3 a / 0.8 - 6vout version eval board 1 sales information sales contacts wrth elektronik eisos gmbh & co. kg emc & inductive solutions max - eyth - str. 1 74638 waldenburg germany tel. +49 (0) 7942 945 0 www.we - online.com powermodules@we - online.com
wpmd h 11 00601 / 171010601 magi 3 c power module vdrm C variable step down regulator module w e - online.com wrth elektronik eisos gmbh & co. kg C d ata sheet r ev. 1 . 0 ? september 2017 4 / 54 absolute maximum ratings caution: exceeding the listed absolute maximum ratings may affect the device negatively and may cause permanent damage. symbol parameter limits unit min (1) max ( 1 ) vin, ron input voltage, on - time resistor - 0.3 43.5 v en, fb, ss enable, feedback, soft - start i nput - 0.3 7.0 v v esd esd v oltage (human body m odel ), according to en61000 - 4 - 2 ( 2 ) - 2000 v t j junction temperature - 150 c t storage assembled, non - operating storage temperature - 65 150 c t sol de r peak case/leads temperature during reflow soldering, max. 20sec (3 ) 235 245 c operating conditions operating conditions are conditions under which operation of the device is intended to be functional. all values are referenced to gnd . symbol parameter min ( 1 ) typ ( 4 ) max ( 1 ) unit v in input voltage 6 - 42 v v out regulated output voltage 0.8 - 6 v v en enable input voltage 0 - 6.5 v t a ambient temperature range - 40 - 105 (5 ) c t j junction temperature range - 40 125 c i out nominal output current 1 a thermal specifications symbol parameter typ (4 ) unit ? ja junctio n - to - ambient thermal resistance (6 ) 19.3 c/w ? j c j unction - to - case thermal resistance 1.9 c/w t sd thermal shutdown , rising 16 5 c thermal shutdown hysteresis , falling 15 c
wpmd h 11 00601 / 171010601 magi 3 c power module vdrm C variable step down regulator module w e - online.com wrth elektronik eisos gmbh & co. kg C d ata sheet r ev. 1 . 0 ? september 2017 5 / 54 electrical specifications min and max limits are valid for the recommended junction temperature range of - 40c to 125c . typical values represents statistically the utmost probability at following conditions: v in = 24v, v out = 3.3v, t a = 25c , unless otherwise specified. symbol parameter test conditions min ( 1 ) typ ( 4 ) max ( 1 ) unit output current i c l current limit threshold 1.1 0 1.18 1.2 5 a output voltage v f b reference voltage v ss >0.8v, t j =25c, i out = 10ma 0.786 0.802 0.818 v reference voltage over temperature v ss >0.8v, - 40ct j 125c, out = 1a 0.777 0.798 0.818 v i fb feedback input bias current - 5 - na v out line regulation v in = 12 v to 42v i out =1 a - 0.01 - % load regulation v in = 24v i out = 0a to 1a - 1.5 - mv/a output voltage ripple v out =5v c out =100 pp protections v fb - ovp feedback over voltage protection threshold - 0.92 - v switching frequency f sw switching frequency continuous conduction mode (ccm) 0.2 - 0.8 mhz t on - min on timer minimum pulse width - 150 - ns t o ff - min off timer minimum pulse width - 260 - ns enable v enable en threshold trip point v en rising 1.10 1.18 1.25 v en threshold hysteresis v en falling - 90 - m v soft - start t ss soft - start time c ss = 0.022f - 2.2 - ms i ss ss pin source current v ss = 0v 5 8 11 a i ss - dis ss discharge current - - 200 - a
wpmd h 11 00601 / 171010601 magi 3 c power module vdrm C variable step down regulator module w e - online.com wrth elektronik eisos gmbh & co. kg C d ata sheet r ev. 1 . 0 ? september 2017 6 / 54 electrical specifications min and max limits are valid for the recommended junction temperature range of - 40c to 125c . typical values represents statistically the utmost probability at following conditions: v in = 24v, v out = 3.3v, t a = 25c , unless otherwise specified. symbol parameter test conditions min ( 1 ) typ ( 4 ) max ( 1 ) unit efficiency in = 24v, v out = 3.3v, i out = 0.5 a , f sw = 500khz - 83 - % v in = 24v, v out = 3.3v, i out = 1 a , f sw = 500khz - 86 - % v in = 24v, v out = 5v, i out = 0.5 a , f sw = 500khz - 85 - % v in = 24v, v out = 5v, i out = 1 a , f sw = 500khz - 89 - % input current i q input quiescent current v fb = 0.86v (7) - 1 - ma i sd shutdown quiescent input current v enable = 0v - 25 - a reliability symbol parameter test conditions min (1) typ (4 ) max (1) unit mtbf (8) mean time between failures - confidence level 60% - test temperature: 125c - usage temperature: 55c - activation energy: 0.7ev - test duration: 1000 hours - sample size: 6471 - fail: 0 5.54 10 8 h rohs, reach rohs d irective directive 2011/65/eu of the european parliament and the council of june 8th, 2011 on the restriction of the use of certain hazardous substances in electrical and electronic equipment. reach d irective directive 1907/2006/eu of the european parliament and the council of june 1st, 2007 regarding the registration, evaluation, authorization and restriction of chemicals (reach) . package specifications mold compound weight part number material ul class certificate number 0.54g 171020601 eme - g760 ul94v - 0 e41429
wpmd h 11 00601 / 171010601 magi 3 c power module vdrm C variable step down regulator module w e - online.com wrth elektronik eisos gmbh & co. kg C d ata sheet r ev. 1 . 0 ? september 2017 7 / 54 notes (1) min and max limits are 100% production tested at 25c. limits over the operating temperature range are guaranteed through correlation using statistical quality control (sqc) methods. (2) the human body model is a 100pf capacitor discharged through a 1.5 k resistor into each pin. test method is per jesd - 22 - 114. (3) jedec j - std020 (4) typical numbers are valid at 25c ambient temperature and represent statistically the utmost probability assuming the gaussian distribution. (5) depending on heat sink design, number of pcb layers, copper thickness and air flow. (6) measured on a 8cm x 8cm four layer pcb, 35m copper, thirty - six 10mil (254m) thermal vias, no air flow (see output power derating section on page 13 ) . (7) module on (enable floating or high), feedback voltage applied by external source ? no pwm switching
wpmd h 11 00601 / 171010601 magi 3 c power module vdrm C variable step down regulator module w e - online.com wrth elektronik eisos gmbh & co. kg C d ata sheet r ev. 1 . 0 ? september 2017 8 / 54 typical performance curves if not otherwise specified, the following conditions apply: v in = 24v ; c in = 10 f x7r ceramic; c out = 100 f x7r ceramic, t amb = 25c. radiated and conducted emissions 0 10 20 30 40 50 60 70 30 100 1000 frequency [ mhz ] radiated emissions [ dbv / m ] radiated emissions 171010601 ( 3 m antenna distance ) v in = 24 v , v out = 5 v , i load = 1 a with i nput filter 1 f ( 885012209047 ) and 10 h ( 7447462100 ) horizontal vertical en 55022 class a limit en 55022 class b limit 1 0 10 20 30 40 50 60 70 0 . 15 1 10 frequency [ mhz ] conducted emissions [ dbv ] conducted emissions 171010601 v in = 24 v , v out = 5 v , i load = 1 a with input filter 4 . 7 f and 10 h ( 7447462100 ) average quasi peak en 55022 class b quasi peak limit en 55022 class b average limit 80 - 10 30 0 . 5
wpmd h 11 00601 / 171010601 magi 3 c power module vdrm C variable step down regulator module w e - online.com wrth elektronik eisos gmbh & co. kg C d ata sheet r ev. 1 . 0 ? september 2017 9 / 54 efficiency 50 55 60 65 70 75 80 85 90 95 100 0 0,25 0,5 0,75 1 efficiency [%] output current [a] 171010601 v in = 12v, f sw =500khz, t a = 25 c vout = 5v vout = 3.3v vout = 2.5v vout = 1.8v 50 55 60 65 70 75 80 85 90 95 100 0 0,25 0,5 0,75 1 efficiency [%] output current [a] 171010601 v in = 12v, f sw =500khz, t a = 85 c vout = 5v vout = 3.3v vout = 2.5v vout = 1.8v
wpmd h 11 00601 / 171010601 magi 3 c power module vdrm C variable step down regulator module w e - online.com wrth elektronik eisos gmbh & co. kg C d ata sheet r ev. 1 . 0 ? september 2017 10 / 54 efficiency 50 55 60 65 70 75 80 85 90 95 100 0 0,25 0,5 0,75 1 efficiency [%] output current [a] 171010601 v in = 24v, f sw =500khz, t a = 25 c vout = 5v vout = 3.3v vout = 2.5v vout = 1.8v 50 55 60 65 70 75 80 85 90 95 100 0 0,25 0,5 0,75 1 efficiency [%] output current [a] 171010601 v in = 24v, f sw =500khz, t a = 25 c vout = 5v vout = 3.3v vout = 2.5v vout = 1.8v
wpmd h 11 00601 / 171010601 magi 3 c power module vdrm C variable step down regulator module w e - online.com wrth elektronik eisos gmbh & co. kg C d ata sheet r ev. 1 . 0 ? september 2017 11 / 54 power dissipation 0,00 0,20 0,40 0,60 0,80 0 0,25 0,5 0,75 1 power dissipation [w] output current [a] 171010601 v in = 12v, f sw =500khz, t a = 25 c vout = 5v vout = 3.3v vout = 2.5v vout = 1.8v 0,00 0,20 0,40 0,60 0,80 0 0,25 0,5 0,75 1 power dissipation [w] output current [a] 171010601 v in = 12v, f sw =500khz, t a = 85 c vout = 5v vout = 3.3v vout = 2.5v vout = 1.8v
wpmd h 11 00601 / 171010601 magi 3 c power module vdrm C variable step down regulator module w e - online.com wrth elektronik eisos gmbh & co. kg C d ata sheet r ev. 1 . 0 ? september 2017 12 / 54 power dissipation 0,00 0,20 0,40 0,60 0,80 0 0,25 0,5 0,75 1 power dissipation [w] output current [a] 171010601 v in = 24v, f sw =500khz, t a = 25 c vout = 5v vout = 3.3v vout = 2.5v vout = 1.8v 0,00 0,20 0,40 0,60 0,80 0 0,25 0,5 0,75 1 power dissipation [w] output current [a] 171010601 v in = 24v, f sw =500khz, t a = 85 c vout = 5v vout = 3.3v vout = 2.5v vout = 1.8v
wpmd h 11 00601 / 171010601 magi 3 c power module vdrm C variable step down regulator module w e - online.com wrth elektronik eisos gmbh & co. kg C d ata sheet r ev. 1 . 0 ? september 2017 1 3 / 54 output power derating the ambient temperature and the power limits of the derating curve represent the operation at the max junction tempera ture specified in the operating conditions section on page 4 . 0,0 0,2 0,4 0,6 0,8 1,0 1,2 0 10 20 30 40 50 60 70 80 90 100 110 120 130 output current [a] ambient temperature [ c] 171010601 current thermal derating v in = 12v, v out = 3.3v, f sw = 500khz, ja = 19.3 c/w 118 c 125 c 0,0 0,2 0,4 0,6 0,8 1,0 1,2 0 10 20 30 40 50 60 70 80 90 100 110 120 130 output current [a] ambient temperature [ c] 171010601 current thermal derating v in = 12v, v out = 5v, f sw = 500khz, ja = 19.3 c/w 117 c 125 c
wpmd h 11 00601 / 171010601 magi 3 c power module vdrm C variable step down regulator module w e - online.com wrth elektronik eisos gmbh & co. kg C d ata sheet r ev. 1 . 0 ? september 2017 14 / 54 the ambient temperature and the power limits of the derating curve represent the operation at the max junction tempera ture specified in the operating conditions section on page 4 . 0,0 0,2 0,4 0,6 0,8 1,0 1,2 0 10 20 30 40 50 60 70 80 90 100 110 120 130 output current [a] ambient temperature [ c] 171010601 current thermal derating v in = 24v, v out = 3.3v, f sw = 500khz, ja = 19.3 c/w 114 c 125 c 0,0 0,2 0,4 0,6 0,8 1,0 1,2 0 10 20 30 40 50 60 70 80 90 100 110 120 130 output current [a] ambient temperature [ c] 171010601 current thermal derating v in = 24v, v out = 5v, f sw = 500khz, ja = 19.3 c/w 113 c 125 c
wpmd h 11 00601 / 171010601 magi 3 c power module vdrm C variable step down regulator module w e - online.com wrth elektronik eisos gmbh & co. kg C d ata sheet r ev. 1 . 0 ? september 2017 15 / 54 line and load regulation 3,2 3,25 3,3 3,35 3,4 6 9 12 15 18 21 24 27 30 33 36 39 42 output voltage [v] input voltage [v] 171010601 line regulation v out = 3.3v, i out = 1a, t a = 25 c 3,2 3,25 3,3 3,35 3,4 0 0,25 0,5 0,75 1 output voltage [v] output current [a] 171010601 load regulation v in = 24v, v out = 3.3v, t a = 25 c ccm operation dcm operation
wpmd h 11 00601 / 171010601 magi 3 c power module vdrm C variable step down regulator module w e - online.com wrth elektronik eisos gmbh & co. kg C d ata sheet r ev. 1 . 0 ? september 2017 16 / 54 block diagram circuit description the magi3c power module 17101 0601 is based on a synchronous step - down regulator with integrated mosfet s and a power inductor. the control scheme uses a constant on - t ime (cot) low ripple hysteretic regulation loop. the v out of the regulator is divided by the feedback resistor network r fbt and r fbb and fed into the fb pin. the internal comparator compa res this signal with the internal 0.8v reference. if the feedback voltage is below the reference, the h igh s ide mosfet is turned on for a fixed on - time. to achieve a regulated output voltage the off - time is modulated. at stable v in to v out condition the relation between on - time and off - time is constant. the on - time is preset by the value of the ron resistor. the switching frequency is directly proportional to this value. the connection of the r on resistor to v in results into an additional compensation of v in variations , (v in feed - forward) so the switching frequency will remain almo st constant even during v in transients. a load current transient (low to high current) allows the off - time to immediately transition to the minimum of 260 ns. this results in a short term higher switching frequency which ensures an extremely quick regulation response. as soon as the output capacitor is recharged to the nominal output voltage the switching frequency will return to the original value even though the load current is higher. the c onstant on - time co ntrol scheme does not require compensation circuitry which makes the overall design very simple. nevertheless , it requires a certain minimum ripple at the feedback pin. the magi3c power module 17101 0601 generates this ripple internally and is supported by the c ff capacitor which bypasses ac ripple directly to the feedback pin from the output. with this architecture very small output ripple values of around 10mv ( similar to current or voltage mode devices) are achieved . c out lss hss ron vin en pgnd ss fb vout 10 h c vcc c bst 0 . 47 f power module agnd controller / power control / protection circuitry linear regulator r on 1 2 6 c ss 5 3 ep 4 7 c in r fbt r fbb c ff vin uvlo v in v out agnd agnd v ref 0 . 8 v comparator
wpmd h 11 00601 / 171010601 magi 3 c power module vdrm C variable step down regulator module w e - online.com wrth elektronik eisos gmbh & co. kg C d ata sheet r ev. 1 . 0 ? september 2017 17 / 54 design flow the next 7 simple steps show how to select the external components to design your power application. essential steps 1. set the output voltage 2. set the operating frequency with r on 3. select the input capacitor 4. select the output capacitor 5. select the feed forward capacitor 6. select the soft - start capacitor optional steps 7. select the undervoltage lockout divider r on c in ron vin en pgnd ss fb vout module r fbt r fbb c ss c ff c out agnd 1 2 3 ep 5 4 6 7 r ent r enb 1 . 2 . 3 . 4 . 6 . 5 . 7 . v in v out gnd gnd
wpmd h 11 00601 / 171010601 magi 3 c power module vdrm C variable step down regulator module w e - online.com wrth elektronik eisos gmbh & co. kg C d ata sheet r ev. 1 . 0 ? september 2017 18 / 54 step 1 s et the output voltage (v out ) the o utput voltage is determined by a divider of two resistors connected between v out and ground. the midpoint of the divider is connected to the fb input. the voltage at fb is compared to a 0.8v internal reference. in normal operation , an on - time cycle is initiated when the voltage on the fb pin fall s below 0.8v. the high - side mosfet on - time cycle causes the output voltage to rise and the voltage at the fb to exceed 0.8v. as long a s the voltage at fb is above 0.8 v, on time cycles will not occur. the ratio of the feedback resistors for the desired out put voltage is: r fbt r fbb = ( v out v fb ) - 1 ( 1 ) these resistors should be chose n from values in the range of 1 k to 20 k . a table of values for r fbt , r fbb , and r on is included in the typical schematic section (page 38 ) . step 2 set the operating frequency (f sw ) with r on many designs begin with a desi red switching frequency in mind. for that purpose the following equation can be used: r on ? v out ( k ? f sw ( ccm ) ) ( 2 ) w here k = 1.3 10 - 10 c and f sw(ccm ) is the switching frequency when the device is working in ccm (continuous conduction mode). while selecting the r on and the f sw(ccm) , the limitations in terms of minimum on - time and off - time must be taken into account . the on - time of the magi3c power module timer is determined by the resistor r on and the input voltage v in . it is calculated as follows: t on = (k ? r on ) v in ( 3 ) the inverse relationship of t on and v in gives a nearly constant switching frequency as v in is varied. the t on is internally limited to a minimum value of 150ns. therefore r on should be selected such that the on - time at maximum v in is greater than 150ns, as the following formula describes: r on v in ( max ) ? t on - min k ( 4 ) this limits the maximum operating frequency, which is governed by the following equation: f sw(max) = v out ( v in ( max ) ? t on - min ) ( 5 ) if the r on calculated in equation ( 2 ) is less than the minimum value determined in equation ( 4 ) a lower frequency should be selected. alternatively, v in(max) can also be limited in order to keep the frequency unchanged .
wpmd h 11 00601 / 171010601 magi 3 c power module vdrm C variable step down regulator module w e - online.com wrth elektronik eisos gmbh & co. kg C d ata sheet r ev. 1 . 0 ? september 2017 19 / 54 all considerations mentioned above are summarized in the diagram below. the curves depict the relation between the switching frequency and the r on for some typical output voltages. for the switching frequency, only the range indicated in the electrical specifications section on page 5 (from 200khz to 800khz) is considered. due to the minimum on - time previously me ntioned, under low duty cycle conditions, there are some limitations in the minimum selectable r on . these limits are shown below with a dotted line and they refer to some typical input voltages (24v, 36v and the maximum operating voltage of 42v). as stated above , the off - time is also limited to a minimum value of 260 ns, which limits the maximum duty cycle . larger r on (lower f sw ) should be selected in any application requiring large duty ratio . the choice of the switching frequency influences the eff iciency of the system, especially at low currents, as the picture below depicts. 50 55 60 65 70 75 80 85 90 95 100 0 0,2 0,4 0,6 0,8 1 efficiency [%] output current [a] efficiency vs frequency, v in = 12v, v out = 5v, t a = 25 c fsw = 200khz fsw = 500khz fsw = 800khz
wpmd h 11 00601 / 171010601 magi 3 c power module vdrm C variable step down regulator module w e - online.com wrth elektronik eisos gmbh & co. kg C d ata sheet r ev. 1 . 0 ? september 2017 20 / 54 step 3 select the input capacitor (c in ) the magi3c power m odule contains an internal 0.47 f input ceramic capacitor. the module requires addition al , external input capacitance to handle the input current ripple . this input capacitance should be located as close as possible to the magi3c power module. input capacitor selection is generally based on different requirements . the first criteria is the input current ripple . worst case input current ripple rating is dictated by the equation: i c inrms 1 2 ? i out ? d 1 - d where d v out v in as a point of reference, the worst case current ripple will occur when the module is presented with full load current and when v in = 2 x v out . recommended minimum input capacitance is 10f (including derating) ceramic with a voltage rating at least 25% higher than the maximum applied input voltage for the application. it is strongly recommended to pay attention to the voltage and temperature deratings of the capacitor selected. it should be noted that current r ipple rating of ceramic capacitors may be missing from the capacitor data sheet and you may have to contact the capacitor manufacturer for this rating . the second criteria is the input voltage ripple. if the system design requires a certain minimum val ue of peak - to - peak input voltage ripple (v in ripple ) then the following equation may be used : c in i out ? d ? ( 1 - d ) f sw(ccm) ? v in ripple as example, i f v in is 1% of v in for a 24v input to 3.3 v output application , and f sw = 400 khz this leads: c in 1a ? 3.3v 24v ? (1 C 3.3v 24v ) 400000 ? 0.240v c in 1.25 f additional bulk capacitance with higher esr may be required to damp any resonant effects between the input capacitance and parasitic inductance of the incoming supply lines.
wpmd h 11 00601 / 171010601 magi 3 c power module vdrm C variable step down regulator module w e - online.com wrth elektronik eisos gmbh & co. kg C d ata sheet r ev. 1 . 0 ? september 2017 21 / 54 step 4 select output capacitor (c out ) none of the required output capacitors are integrated within the module. a general recommendation in o rder to guarantee a stable behavior is to place at least a capacitance of 10f (mlcc recommended) at the output. the output capacitor must meet the worst case rms current rating, as calculated by equation ( 8 ) : i c outrms = ? i l 12 ( 8 ) where ?i l is the inductor current ripple calculated with the equation ( 9 ) ? i l = v out ? ( v in - v out ) f sw ? l ? v in ( 9 ) selection by output voltage ripple requirements the output capacitor should be selected in order to minimize the output voltage ripple and provide a stable voltage at the output. under steady state conditions, the voltage ripple observed at the output can be defined as: v out ripple = ? i l ? esr+ ? i l ? 1 8? f sw ? c out ( 10 ) very low esr capacitors, like ceramic and polymer electrolytic, are recommended. if a low esr ca pacitor is selected, equation ( 10 ) can be simplified and a first condition for the minimum capacitan ce value can be derived: c out ? i l 8 ? v out ripple ? f sw beyond that, the additional capacitance will reduce the output voltage ripple as long as the esr is low enough to permit it. please consider the derating of the nominal capacitance value due to temperature, aging and applied dc voltage ( e.g. mlcc x7r up to - 50%). l c out v in v out i l i out hs mosfet esr v es r v cout ls mosfet c in r load
wpmd h 11 00601 / 171010601 magi 3 c power module vdrm C variable step down regulator module w e - online.com wrth elektronik eisos gmbh & co. kg C d ata sheet r ev. 1 . 0 ? september 2017 22 / 54 the use of very low esr capacitors leads to an output voltage ripple as shown below (generic waveform) : when capacitors with slightly higher esr are utilized, the dominant paramete r that influences the output voltage ripple is just the esr: esr v out ripple ? i l consequently , the shape of th e output voltage ripple changes as shown below (generic waveform) : -10 -5 0 5 10 0 1 2 3 output voltage ripple [mv] time [s] output voltage ripple with low esr capacitors -100 -50 0 50 100 0 1 2 3 output voltage ripple [mv] time [s] output voltage ripple with high esr capacitors
wpmd h 11 00601 / 171010601 magi 3 c power module vdrm C variable step down regulator module w e - online.com wrth elektronik eisos gmbh & co. kg C d ata sheet r ev. 1 . 0 ? september 2017 23 / 54 selection by load step requirements the output voltage is also affected by load transient s (see picture below). the constant on - time control scheme generally provides faster response than the other control loops. when the output current transition s from a low to a high value, the voltage at the output capacitor (v out ) drops due to two contributing factors . one is caused by the voltage drop across the esr (v esr ) and depends on the slope of the rising edge of the current step (t rise ) . for low esr valu es and small load currents, this is often negligible . it can be calculated as follows: v esr = esr ? ? i out w here ? i out is the load step , as shown in the picture below (simplified: no voltage ripple is shown). 0 t i out 0 t v out ?i out ?v out v esr v discharge t d t reg t rise
wpmd h 11 00601 / 171010601 magi 3 c power module vdrm C variable step down regulator module w e - online.com wrth elektronik eisos gmbh & co. kg C d ata sheet r ev. 1 . 0 ? september 2017 24 / 54 the second co ntributing factor is the voltage drop due to the discharge of the output capacitor . in order to estimate this contribution, the behavior of the inductor current during the transient should be analyzed (see picture below , esr contribution neglected). at the transition, the device tries to reach the new steady state as fast as possible by increasing the inductor current. this can be achieved only by modulating the off - time t off since the on - time is fixed and defined by r on . the device has a minimum t off (t off - min = 260ns typ.). therefore, as long as the new steady state is not achieved, th e inductor current increases by performing consecutive cycles of t on and t off - min . during the transition to the new output current, the load demand is supported by the energy stored in the output capacitor. for that reason, the output voltage drops until t he average inductor current reaches the new output current. the time for reaching this condition (t d ) can be calculated as follows : t d = (? i out + ? i l 2 )?l?( t on + t off - min ) v in ? t on - v out ? ( t on + t off - min ) ( 14 ) the t d calculated above represents the worst case, i.e. it is supposed that the load transient occurs when the inductor current has its minimum value ( i out ? ? i l 2 ) . the selection of the c out is related to the t d as well as to the current step ?i out and the max allowed voltage drop ?v out , as shown by the following equation: c out (? i out + ? i l 2 )? t d 2?? v out 0 0,5 1 1,5 2 2,5 3 -200 -150 -100 -50 0 50 100 150 200 i l v out t on t offmin load transition t d i out1 i out2 ?v out t i l , v out
wpmd h 11 00601 / 171010601 magi 3 c power module vdrm C variable step down regulator module w e - online.com wrth elektronik eisos gmbh & co. kg C d ata sheet r ev. 1 . 0 ? september 2017 25 / 54 the same equation can be used for calculating the minimum required capacitance for an output current transition from high to low (see picture below ). since the inductor current must reach the new steady state with a lower value than before, there is no nee d to trigger a new on - time cycle. instead, the off - time is extended until the average inductor current reaches the new load current value. the excess of current during this time charges the output capacitor. this causes the output voltage to increase and a n overshoot occurs. the time t d for reaching the new steady state can be calculated for a negative load transient with the following equation: t d = l v out ? ( ? i l 2 +? i out ) + t on the equation ( 16 ) shows the worst case in terms of the current ( i out + ? i l 2 ) as well as in terms of time. the inclusion of t on in the formula takes into account a new on - time triggered in case the load transient occurs at the end of the of f - time. under this condition a new on - time is generated because the device has not yet reacted to the transient and to the consequent deviation of v out from its steady state value (see figure below) . -0,5 0 0,5 1 1,5 2 2,5 3 -200 -150 -100 -50 0 50 100 150 200 0 10 20 30 v out i l t d i out2 i out1 ?i out ?v out load transition t on t off t i l , v out
wpmd h 11 00601 / 171010601 magi 3 c power module vdrm C variable step down regulator module w e - online.com wrth elektronik eisos gmbh & co. kg C d ata sheet r ev. 1 . 0 ? september 2017 26 / 54 example the following application conditions are used as an example to show how to calculate a suitable c out value : - v in = 24 v - v out = 5v - r on = 75k - load transient from 0.5a to 1 a and vice versa (?i out = 0.5 a) - max allowed undershoot or overshoot ?v out = 100mv the c out can be calculated using the equation ( 15 ) on page 24 . this equation provides two possible values depending on whether t d is calculated for a positive load transient (generating a v out drop) or for a negative load transient (resulting in a v out overshoot). in case of positive load transient: t d = 9 2 0n s and c out 4.1 f in case of negative load transient: t d = 2.18 s and c out 9.6 f a combination of 10f ( wrth elektronik, part number 885012109008 ) + 4.7f ( 885012109008 ) mlcc are selected. some margin from the calculated c out value is recommended in order to take into account: - approximations within the equations to estimate td and c out itself; - tolerances and variations of some components and parameters involved in those equations (e.g. r on , t off - min , l, k, etc.) - derating of the capacitors with dc applied voltage and temperature the use of two mlccs in parallel cont ributes to the further reduction of the total esr. the load transient s with the selected c out can be tested using the setup depicted below: magi 3 c power module q 1 c out r load 1 r load 2 i out 1 i out 2 v in gnd vin vout gnd 10 ? 10 ?
wpmd h 11 00601 / 171010601 magi 3 c power module vdrm C variable step down regulator module w e - online.com wrth elektronik eisos gmbh & co. kg C d ata sheet r ev. 1 . 0 ? september 2017 27 / 54 the results of t he load transient tests with the selected c out are shown below : in both the positive and the negative transition, the ?v out is significantly below the target (100mv). the explanation of the strong reduction of the ?v out lies in the use of a capacitance value higher than the one calculated. -200 -150 -100 -50 0 50 100 150 200 0 1 2 3 4 0 10 20 30 40 50 60 70 80 90 100 110 120 output voltage ac [mv] output current [a] time [s] load transient from 0.5a to 1a i out1 v out ?v out = 30mv i out2 -200 -150 -100 -50 0 50 100 150 200 0 1 2 3 4 0 10 20 30 40 50 60 70 80 90 100 110 120 output voltage ac [mv] output current [a] time [s] load transient from 1a to 0.5a v out ?v out = 55mv i out2 i out1
wpmd h 11 00601 / 171010601 magi 3 c power module vdrm C variable step down regulator module w e - online.com wrth elektronik eisos gmbh & co. kg C d ata sheet r ev. 1 . 0 ? september 2017 28 / 54 step 5 select the feed forward c apacitor (c ff ) a feed - forward capacitor c ff is placed in parallel with r fbt that bypasses ac ripple directly to the feedback pin from the output to support the internal ripple generator . this capacitor also affects the load step transient response. its value is usually determined experimentally by load stepping between dcm and ccm and adjusting for best transient response and minimum output ripple. a value of 22nf has been practically evaluated as the best choice. the feed forward capacitor c ff should be located close to the fb pin . step 6 select s oft - start capacitor (c ss ) a minimum soft - start capacitance of 22nf is required. p rogrammable soft - start permits the regulator to slowly ramp up to its steady state operating point after being enabled, thereby reducing the input current at start - up and slowing the output voltage rise - time to prevent overshoot. upon turn - on, after all uvlo conditions have been passed, an internal 8 a current source begins charging the external soft - start capacitor. the soft - start ca pacitor can be calculated with: c ss = t ss ? 8 a 0.8v where t ss in the desired soft - start time in milliseconds. the u se of a 22n f capacitor results in 2.2ms soft - start duration. as the soft - start input exceeds 0.8v the output of the power stage will be in regulation. the soft - start capacitor continues charging until it reaches approximately 3.8v on the ss pin. voltage levels between 0.8v and 3.8v do not influence the regulation of the output voltage . the picture below shows the output voltage under three different soft - start conditions : 0,0 0,5 1,0 1,5 2,0 2,5 3,0 3,5 4,0 4,5 5,0 5,5 6,0 0 2 4 6 8 10 12 output voltage [v] time [ms] output voltage at start up with different soft - start capacitors at v out = 5v css = 22nf css = 47nf css = 68nf enable
wpmd h 11 00601 / 171010601 magi 3 c power module vdrm C variable step down regulator module w e - online.com wrth elektronik eisos gmbh & co. kg C d ata sheet r ev. 1 . 0 ? september 2017 29 / 54 note that high values of the c ss capacitance will cause more output voltage droop when a load transient goes across the dc m - ccm boundary. use equation ( 22 ) in the light load operation section (page 33 ) to find the dcm - ccm load current boundary for the specific operating condition s . if a fast load transient response is desired for steps between dcm and ccm mo de the soft - start capacitor value should be less than 0.018 f. note that the following conditions will reset the soft - start capacitor by discharging the ss input to ground with an internal 200 a current sink: 1. the enable input being pulled low 2. thermal shu tdown condition 3. over current fault 4. internal uvlo at input step 7 optional: select enable divider, r ent , r enb (external uvlo) the enable input provides a precise 1.18v reference threshold to allow a direct logic drive or connection to a voltage divider from a higher voltage such as v in . the en able input also incorporates 90 mv (typ . ) of hysteresis resulting in a falling threshold of 1.09v. the maximum recommended voltage into the en pin is 6.5v. for applications where the midpoint of the enable divider ex ceeds 6.5v, a small zener diode can be added to limit this voltage. the function of the r ent and r enb divider shown in the application block d iagram is to allow the designer to choose an input voltage below which the circuit will be disabled. this implements the feature of programmable external under voltage lockout. this is often used in battery powered systems to prevent deep discharge of the system battery. it is also useful in system designs for sequencing of output rails or to prevent early turn - on of the supply as the main input voltage rail rises at power - up . most systems will benefit by using the precision enable threshold to establish a system under voltage lockout. without an external enable divider the device would attempt to turn on around v in = 3.5v. in case of output voltages higher than this turn on threshold, the v out follows the v in as long as v in wpmd h 11 00601 / 171010601 magi 3 c power module vdrm C variable step down regulator module w e - online.com wrth elektronik eisos gmbh & co. kg C d ata sheet r ev. 1 . 0 ? september 2017 30 / 54 determine power losses and thermal requirements of the board this section provides an example of calculation of power losses and thermal design of the board. as a starting point the following application conditions can be considered: v in =24v, v out =3.3v, i out =1a, t a(max) =85c and t j ( max ) =125c where t a is the maximum air tem perature surrounding the module and t j(max) is the maximum value of the junction temperature according to the limits in the operating conditions section on page 4 . the goal of the calculation is to determine the characteristics of the required heat sink. in the case of a surface mounted module this would be the pcb (number of layers, copper area and thickness). these characteristics are reflected in the value of the case to ambient thermal resistance ( ja ) . the basic formula for calculating the operating junction temperature t j of a semiconductor device is as follows: t j = p ic - loss ? ja + t a p ic - loss are the total power losses within the module s ic and are related to the operating conditions. ? ja is the junction to ambient thermal resistance and calculated as: ja = jc + ca ? j c is the junction to case thermal resistance . combining equation s ( 19 ) and ( 20 ) results in the maximum case - to - ambient thermal resistance: ca(max) < t j(max) - t a(max) p ic - loss - jc from section thermal specifications (page 4 ) the typical thermal resistance from junction to case ( jc ) is defined as 1.9 c/w. use the 85c power dissipation curves in the typical performance curves section (page 12 ) to estimate the p ic - loss for the application being designed. 0,00 0,20 0,40 0,60 0,80 1,00 0 0,25 0,5 0,75 1 power dissipation [w] output current [a] 171010601 v in = 24v, f sw =500khz, t a = 25 640mw
wpmd h 11 00601 / 171010601 magi 3 c power module vdrm C variable step down regulator module w e - online.com wrth elektronik eisos gmbh & co. kg C d ata sheet r ev. 1 . 0 ? september 2017 31 / 54 from the graph a power loss of 640m w is read . en tering the values in formula ( 21 ) results in: ca(max) < 125c - 85c 0.64w - 1.9c/w =60.6 c/w ja(max) = jc + ca(max) =1.9c/w+ 60.6 c/w= 62.5 c/w ja < 62 . 5c / w it would be sufficient to use the minimum area for placing the external components, in accordance with the indications in the layout recommendation section on page 39 .
wpmd h 11 00601 / 171010601 magi 3 c power module vdrm C variable step down regulator module w e - online.com wrth elektronik eisos gmbh & co. kg C d ata sheet r ev. 1 . 0 ? september 2017 32 / 54 light load operation under light load conditions, the device continuously decreases the switching frequency and thereby maintains a high efficiency. at light load , the regulator will operate in discontinuous conduction m ode (dcm). w hen the load current is above the critical c onduc tion point, it will operate in continuous c onduction m ode (ccm). when operating in dcm the switching cycle begin s at an inductor current of zero ampere, increases up to a peak value, and then recedes back to zero before the end of the off - time. note t hat during the period of time when the inductor current is zero, all load current is supplied by the output capacitor. the next on - time period starts when the voltage on the fb pin falls below the internal reference. the switching frequency is lower in dcm and varies more with load current as compared to ccm. the pictures below depict how the current flows in the inductor during the dcm operation with two different load current (10ma and 50ma) .
wpmd h 11 00601 / 171010601 magi 3 c power module vdrm C variable step down regulator module w e - online.com wrth elektronik eisos gmbh & co. kg C d ata sheet r ev. 1 . 0 ? september 2017 33 / 54 in ccm, current flows through the inductor through the entire switching cycle and never falls to zero during the off - time. the switching frequency remains relatively constant with load current and line voltage variations. the ccm operating frequency can be calculated using the equation below . the load current where the transition between dcm and ccm takes place can be estimated using the following formula: i out(dcm) = v out ? ( 1 - v out v in ) 2? f sw ? l
wpmd h 11 00601 / 171010601 magi 3 c power module vdrm C variable step down regulator module w e - online.com wrth elektronik eisos gmbh & co. kg C d ata sheet r ev. 1 . 0 ? september 2017 34 / 54 output voltage ripple the output voltage ripple of the v out depends on several parameter s , as already shown in design flow C step4 . the operating mode (ccm or dcm) further influences the o utput voltage ripple as shown in the two figures below : t he output voltage ripple during ccm operation is much lower (<10mv pp ) than the ripple during dcm operation (aroun d 3 0mv pp ). -30 -20 -10 0 10 20 30 0 20 40 60 80 100 120 output voltage ripple [mv] time [s] v out ripple - v in = 24v, v out = 5v, i out = 50ma, f sw = 500khz - dcm operation 30mv -30 -20 -10 0 10 20 30 0 2 4 6 8 10 12 14 16 18 20 output voltage ripple [mv] time [s] v out ripple - v in = 24v, v out = 5v, i out = 1a, f sw = 500khz - ccm operation 9mv
wpmd h 11 00601 / 171010601 magi 3 c power module vdrm C variable step down regulator module w e - online.com wrth elektronik eisos gmbh & co. kg C d ata sheet r ev. 1 . 0 ? september 2017 35 / 54 protective features o utput overv oltage p rotection (ovp) the voltage at the fb is compared to a 0. 8v internal reference while the over voltage protection (ovp) has a threshold of 0.92v. if fb rises above this limit, the on - time is immediately termin ated. it can occur if the input voltage is increased with a very high d v in dt or if the output current is d ecreased with a very d i out dt . once ovp is activated, the high - side mosfet on - times will be inhibited until the condi tion clears. additionally, the low - side mosfet will remain on until the inductor current falls to zero . then both high - side and low - side mos fets are turned off as long as the overvoltage condition is not removed (see figure below) .
wpmd h 11 00601 / 171010601 magi 3 c power module vdrm C variable step down regulator module w e - online.com wrth elektronik eisos gmbh & co. kg C d ata sheet r ev. 1 . 0 ? september 2017 36 / 54 overcurrent protection (ocp) current limit detection is carried out during the off - time by monitoring the current in the low - side mosfet. referring to the functi onal block diagram, when the high - side mosfet is turned off, the inductor current flows through the load, the pgnd pin and the internal low - side mosfet. if this current exceeds the i cl value, the current limit comparator disables the start of the next on - time period. the i nductor current is monitored during the off - time. as long as the inductor current exceeds i cl , further on - time intervals will not occur. the next switching cycle will occur only if the fb input is less than 0.8v and the inductor current has decreased below i cl ( see figure below) . the s witching frequency is lower during current limit ed operation due to the longer off - time. due to the current limitation the output voltag e drops (see figure below). it should also be noted that the dc current limit varies with the duty cycle, switching frequency, and temperature. at continuous overcurrent load the module junction temperature increase until the overtemperature protection (ot p) is triggered. short circuit protection in case of short circuit, the device detects the condition during the off - time monitoring the current in the low - side mosfet. as long as the current remains above i cl , the start of the next on - time is prevented. a new on - time cycle occurs when the current falls below i cl (under short condition v out = 0 and v fb = 0, therefore the condition v fb <0.8v is always fulfilled). the device alternates very short on - time and extended off - time (see figure below). 0,0 1,0 2,0 3,0 4,0 5,0 6,0 -2,0 -1,0 0,0 1,0 2,0 3,0 4,0 0 0,4 0,8 1,2 1,6 2 2,4 output voltage [v] inudctor current [a] time [ms] current limit output voltage drop overcurrent detected during t off i l < i cl and v fb <0.8v t on triggered inductor current time
wpmd h 11 00601 / 171010601 magi 3 c power module vdrm C variable step down regulator module w e - online.com wrth elektronik eisos gmbh & co. kg C d ata sheet r ev. 1 . 0 ? september 2017 37 / 54 overtemperature protection (otp) the junction temperature of the magi3c power module should not be allow ed to exceed its maximum rating . thermal protection is implemented by an internal t hermal s hutdown circuit which activates at 165 c (typ . ) causing the device to enter a low power standby state. in this state , the high - side mosfet remains off causing v out to fall, and additionally the c ss capacitor is discharged to ground. thermal protection helps to prevent catastrophic failures in case of accidental device overheating. when the junction t emperature falls back below 150c (typical hysteresis = 15 c) the ss pin is released, v out rises smoothly, and normal operation resumes. zero coil current detection (zcct) the current of the low - side mosfet is monitored by a zero coil current detection circuit that inhibits the low - side mosfet when its current reaches zero until the next on - time. this circuit prevents a negative inductor current and enables the dcm operating mode . in this way the effi ciency at light loads is improved, also because the output capacitor is not discharged by the negative current. start up into pre - biased load the magi3c power module will properly start up into a pre - biased output. this start up situation is common in mu ltiple rail logic applications where current paths may exist between different power rails during the start up sequence. the uvlo threshold must be set higher than the pre - bias level of the output voltage (see figure below) . this will prevent the pre - biased output from enabling the regulator through the high - side mosfet body diode . v t v in v out v uvlo adjustable
wpmd h 11 00601 / 171010601 magi 3 c power module vdrm C variable step down regulator module w e - online.com wrth elektronik eisos gmbh & co. kg C d ata sheet r ev. 1 . 0 ? september 2017 38 / 54 typical schematic quick setup guide conditions: t a = 25c, i out = 1 a recommended component values v out 5v 3.3v 2.5v 1.8v 1.5v 1.2v r fbt 5.62k? k? k? k? k? k? r fbb 1. 07 k? k? k? k? k? k? r on 1 00 k? k? k? k? k? k? c in 10f c out 100f c ss 0.022f c ff 0.022f v in 7.5 - 42v 6 - 42v 6 - 30v 6 - 25v 6 - 21v 6 - 19v r on c in ron vin en pgnd ss fb vout module r fbt r fbb c ss c ff c out agnd 1 2 3 ep 5 4 6 7 v in v out gnd gnd
wpmd h 11 00601 / 171010601 magi 3 c power module vdrm C variable step down regulator module w e - online.com wrth elektronik eisos gmbh & co. kg C d ata sheet r ev. 1 . 0 ? september 2017 39 / 54 layout recommendation pc b layout is an important part of dc - dc converter design. poor board layout can disrupt the performance of a dc - dc converter and surrounding circuitry by contributing to emi, ground bounce and resistive voltage drop in the traces. these can send erroneous si gnals to the dc - dc converter resulting in poor regulation or instability. a g ood layout can be implemented by following simple design rules. 1: minimize the area of switched current loops. the target is to identify the paths in the system that have discontinuous current flow. they are the most critical ones because they act as an antenna and cause observable high frequency noise (emi). the easiest approach to find the critical paths is to dr aw the high current loops during both switching cycles and identify the sections which do not overlap . they are the ones where no continuous current flows and high di/dt is observed. loop1 is the current path during the on - time of the high - s ide mosfet. loo p2 is the current path during the off - time of the high - s ide mosfet. based on those considerations, the path of the input capacitor c in is the most critical one to generate high frequency noise on v in . therefore place c in as close as possible to the magi3c power module v in and pgnd exposed pad ep . this will minimize the high di/dt area and reduce radiated emi. additionally, grounding for both the input and output capacitor should consist of a localized top side plane that connects to the pgnd exposed pa d . c in vin pgnd vout power module c out loop 1 loop 2 high di / dt v in v out gnd gnd v in vin fb pgnd vout module r fb t r fb b c out agnd 6 7 c in 1 ep 4 v out gnd gnd
wpmd h 11 00601 / 171010601 magi 3 c power module vdrm C variable step down regulator module w e - online.com wrth elektronik eisos gmbh & co. kg C d ata sheet r ev. 1 . 0 ? september 2017 40 / 54 the placement of the input capacitors is highlighted in the following picture. pcb color coding: top layer bottom layer the positive terminal of c in1 and c in2 need to be very close to the vin pin of the power module. the negative terminal of c in1 and c in2 needs to be very close to the pgnd pad of the power module. c in 1 c in 2 c out 1 c out 2 v in gnd gnd v out 1 2 4 3 5 6 7 vin ron en agnd ss fb vout r on c ss r fbt r fbb c ff pgnd magi 3 c module bottom ground plane r ent r enb c in 1 c in 2 c out 1 c out 2 v in gnd gnd v out 1 2 4 3 5 6 7 vin ron en agnd ss fb vout r on c ss r fbt r fbb c ff pgnd magi 3 c module bottom ground plane r ent r enb
wpmd h 11 00601 / 171010601 magi 3 c power module vdrm C variable step down regulator module w e - online.com wrth elektronik eisos gmbh & co. kg C d ata sheet r ev. 1 . 0 ? september 2017 41 / 54 2: analog ground (agnd) connections the ground connections for the soft - start capacitor (c ss ), the output voltage lower resistor divider (r fbb ) and enable components (when used) should be routed to the agnd pin of the device. if not properly handled, poor grounding can result in degrade d load regulation or erratic output voltage ripple behavior. place c ss , r fbt and r fbb close to their respective pins . 3 : analog ground (agnd) to power ground (pgnd) connections module internal connection: the agnd is internally connected to pgnd at a low noise node. the output ground current is flowing from the pgnd pad through the ground plane through the ground terminal of the first output capacitor. due to its very low ripple it will not inject noise in the ground plane. c in 1 c in 2 c out 1 c out 2 v in gnd gnd v out 1 2 4 3 5 6 7 vin ron en agnd ss fb vout r on c ss r fbt r fbb c ff pgnd magi 3 c module bottom ground plane r ent r enb c in 1 c in 2 c out 1 c out 2 v in gnd gnd v out 1 2 4 3 5 6 7 vin ron en agnd ss fb vout r on c ss r fbt r fbb c ff pgnd magi 3 c module bottom ground plane r ent r enb
wpmd h 11 00601 / 171010601 magi 3 c power module vdrm C variable step down regulator module w e - online.com wrth elektronik eisos gmbh & co. kg C d ata sheet r ev. 1 . 0 ? september 2017 42 / 54 4 : connection to vin in order to avoid noise injection into ron pin , the resistor r on should be routed to one of the input capacitors. 5 : feedback layout the resistor divider ( r fbt and r fbb ) should be located close to the fb pin. since the fb node is high impedance, the trace thickness should be kept small. the traces from the fb pin to the middle point of the resistor d ivider should be as short as possible. the upper terminal of the output resistor divider (where the v out is normally applied) should be connected to the positive terminal of the last output capacitor (c out2 ), because this is the node with the lowest noise. the traces from r fbt , r fbb and c ff should be routed away from the body of the magi3c power module to minimize noise pickup. c in 1 c in 2 c out 1 c out 2 v in gnd gnd v out 1 2 4 3 5 6 7 vin ron en agnd ss fb vout r on c ss r fbt r fbb c ff pgnd magi 3 c module bottom ground plane r ent r enb c in 1 c in 2 c out 1 c out 2 v in gnd gnd v out 1 2 4 3 5 6 7 vin ron en agnd ss fb vout r on c ss r fbt r fbb c ff pgnd magi 3 c module bottom ground plane r ent r enb
wpmd h 11 00601 / 171010601 magi 3 c power module vdrm C variable step down regulator module w e - online.com wrth elektronik eisos gmbh & co. kg C d ata sheet r ev. 1 . 0 ? september 2017 43 / 54 6 : make input and output bus connections as wide as possible t his reduces any voltage drops on the input or output of the converter and maximizes efficiency. 7 : provi de adequate device heat - sinking place a dedicated pgnd copper area beneath the magi3c power module. use an array of heat - s inking vias to connect the pgnd pad to the ground plane on the bottom pcb layer. if the pcb has multiple of copper layers, these thermal vias can also be used to make a connection to the heat - spreading ground planes located on inner layers . c in 1 c in 2 c out 1 c out 2 v in gnd gnd v out 1 2 4 3 5 6 7 vin ron en agnd ss fb vout r on c ss r fbt r fbb c ff pgnd magi 3 c module bottom ground plane r ent r enb c in 1 c in 2 c out 1 c out 2 v in gnd gnd v out 1 2 4 3 5 6 7 vin ron en agnd ss fb vout r on c ss r fbt r fbb c ff pgnd magi 3 c module bottom ground plane r ent r enb
wpmd h 11 00601 / 171010601 magi 3 c power module vdrm C variable step down regulator module w e - online.com wrth elektronik eisos gmbh & co. kg C d ata sheet r ev. 1 . 0 ? september 2017 44 / 54 for best result, use a thermal via array as proposed in the picture above with drill of max 250m, spaced 750m apart . ensure enough copper area is used for heat - sinking, to keep the junction temperature below 125c. 8 : isolate high noise areas place a dedicated solid gnd copper area beneath the magi3c power module . 750 m 250 m 750 m c in 1 c in 2 c out 1 c out 2 v in gnd gnd v out 1 2 4 3 5 6 7 vin ron en agnd ss fb vout r on c ss r fbt r fbb c ff pgnd magi 3 c module bottom ground plane r ent r enb
wpmd h 11 00601 / 171010601 magi 3 c power module vdrm C variable step down regulator module w e - online.com wrth elektronik eisos gmbh & co. kg C d ata sheet r ev. 1 . 0 ? september 2017 45 / 54 evaluation board schematic (17801 0601 v3.1 ) the evaluation board schematic has been developed to be suitable for all input and out put voltage conditions, switching frequencies and load current s as well as to achieve optimum load transient response. the two multi - layer ceramic capacitors (mlccs) c2 and c3 at the input handle the switching current ripple and support fast load transients preventing the voltage at the vin pin from dropping, potentially below the uvlo thre s h old . two mlccs in parallel helps to reduce the esr. the additional aluminum electrolytic capacitor c1 is only for evaluation board protectio n purpose. it is mounted as termination of the supply line and provides a slight damping of possible oscillations of the series resonance circuit represented by the inductance of the supply line and the input capacitance. the additional mlcc cf is part of the input filter and is moun ted on the board. the inductor lf in stead is not mounted and replaced by the zero ohm resistor r19. in case the input filter is placed, r19 must be removed and an appropriate lf mounted. the output capacitors should provide a lo w esr, in order to reduce the output voltage ripple . the requirement of high capacitance for good transient response performance is fulfilled by mounting an additional aluminum polymer capacitor c6 in parallel to the mlcc output capacitors . the use of two mlccs in parallel leads to a very low total esr. furthermore , the use of more mlccs in parallel at the input and at the output increases the reliability of the system (in case one capacitor fails, there is still another one remaining) . operational requirements at high duty cycles (v in very close to v out ) the input current will be very similar to the output current . make sure that your supply for the module is capable of delivering high enough currents (check the current limit setting of your power supply). in case your module output voltage v out is set to very low values (for example 0.8v) electronic loads might not be able to work correctly. use discrete high power resistors instead as a load.use thick and short leads to the input of the module and to the load. high currents result in additional voltage drops across the cables which decrease the voltage at the load. measure the input and output voltage directly at the ceramic capacitors at the input and output (test points). in order to have a const ant switching frequency of 500khz, put the jumper of r on on the same line of the jumper of the selected v out (see below). r on c 2 ron vin en pgnd ss fb vout module r fbt r fbb c ss c ff c 4 agnd 1 2 3 ep 5 4 6 7 r ent r enb c 5 v in v out ic 1 cf r 19 lf c 3 gnd gnd + c 1 + c 6 optional input filter optional optional 90 k 9 75 k 0 49 k 9 37 k 4 27 k 4 18 k 2 adj 6 v 5 v 3 . 3 v 2 . 5 v 1 . 8 v 1 . 2 v adj ron selection v out selection that corresponds to f sw = 500 khz 90 k 9 75 k 0 49 k 9 37 k 4 27 k 4 18 k 2 adj 6 v 5 v 3 . 3 v 2 . 5 v 1 . 8 v 1 . 2 v adj ron selection v out selection that does not correspond to f sw = 500 khz
wpmd h 11 00601 / 171010601 magi 3 c power module vdrm C variable step down regulator module w e - online.com wrth elektronik eisos gmbh & co. kg C d ata sheet r ev. 1 . 0 ? september 2017 46 / 54 bill of material designator description quantity order code manufacturer ic1 magi 3 c power module 1 17101 0601 wrth elektronik c1 aluminum e lectrolytic capacitor 100 f c eramic chip capacitor 1 f/ 50 v , x7r, 1210 1 885012209047 wrth elektronik c ff ceramic chip capacitor 22nf/50v x7r, 0805 1 885012207094 wrth elektronik c ss ceramic chip capacitor 4.7nf/50v, cog, 0805 1 l f not mounted, see recommended value in the section on the next page ent , r enb not mounted r19 smd bridge 0? fbt 10k? fbb set by jumper 1.54 k? out = 6v 1 1.87 k? for v out = 5v 1 3.16 k? for v out = 3.3v 1 4.64 k? for v out = 2.5v 1 7.87 k? for v out = 1.8v 1 20 k? for v out = 1.2v 1 not connected for adjustable v out r on set by jumper 90 .9 k?, f sw = 500khz if r fbb = 1.54k ? 75 k?, f sw = 500khz if r fbb = 1.87k ? 49.9 k? sw = 500khz if r fbb = 3.16k ? 37.4 k? sw = 500khz if r fbb = 4.64k ? 27.4 k? sw = 500khz if r fbb = 7.87k ? 18.2 k? sw = 500khz if r fbb = 20k ? on
wpmd h 11 00601 / 171010601 magi 3 c power module vdrm C variable step down regulator module w e - online.com wrth elektronik eisos gmbh & co. kg C d ata sheet r ev. 1 . 0 ? september 2017 47 / 54 filter suggestion for conducted emi the input filter shown in the schematic below is recommended to achieve conducted compliance according to en55022 class b (see results on page 8 ). for radiated emi the input filter is not necessary. it is only used to comply with the setup recommended in the norms. bill of material of the input lc filter designator description order code manufacturer c f filter ceramic chip capacitor 1 f/ 50 v , x7r, 1210 885012209047 wrth elektronik lf filter inductor, 10h, ti family 7447462100 wrth elektronik filter inductor, 10 h, pd2 family (pads located on the bottom layer of the evaluation board) 74477410 wrth elektronik c 2 v in cf lf c 3 gnd + c 1 input lc filter vin gnd power module
wpmd h 11 00601 / 171010601 magi 3 c power module vdrm C variable step down regulator module w e - online.com wrth elektronik eisos gmbh & co. kg C d ata sheet r ev. 1 . 0 ? september 2017 48 / 54 handling reco mmendations 1. the power module is classified as msl 3 (jedec moisture sensitivity level 3) and requires special handling due to moisture sensitivity ( jedec j - std033 ). 2. the parts are delivered in a sealed bag ( moisture barrier bags = mbb) and should be processed within one year. 3. when opening the moisture barrier bag check the humidity indicator card (hic) for color st atus. bake parts prior to soldering in case indicator color has changed according to the notes on the card . 4. p arts must be processed after 168 hour (7 days) of floor life. once this time has been exceeded, bake parts prior to soldering per jedec j - std033 recommendation. solder profile 1. only pb - free assembly is recommended according to jedec j - std020. 2. measure the peak reflow temperature of the magi3c power module in the middle of the top view. 3. ensure that the peak reflow temperature does not exceed 240c 5c as per jedec j - std020 . 4. the r eflow time period during p eak t emp erature of 240c 5c must not exceed 20 seconds. 5. reflow time above liquidus (217c) must not exceed 60 seconds. 6. maximum r amp up is rate 3 c per second 7. maximum r amp down rate is 6c per second 8. reflow time from room (25c) to peak must not exceed 8 minutes as per jedec j - std020 . 9. maximum numbers of reflow cycles is two . 10. for minimum risk, solder the module in the last reflow cycle of the pcb production. 11. for soldering process please consider lead material copper (cu) and lead finish tin (sn). 12. for solder paste use a standard sac alloy such as sac 305, type 3 or higher. 13. below profile is valid for convection reflow only 14. other soldering methods (e.g.vapor phase) are not verified and have to be validated by the customer on his own risk t e m p e r a t u r e [ c ] t i m e [ s e c ] 1 5 0 1 8 0 2 1 7 m a x 2 4 5 m a x 1 2 0 s e c m i n 6 0 s e c m a x 6 0 s e c m i n 3 0 s e c m a x 1 0 - 2 0 s e c 2 4 0 c r a m p u p r a t e m a x 3 c / s e c r a m p d o w n r a t e m a x 6 c / s e c m a x 2 s o l d e r c y c l e s ! p r e h e a t l i q u i d u s p e a k
wpmd h 11 00601 / 171010601 magi 3 c power module vdrm C variable step down regulator module w e - online.com wrth elektronik eisos gmbh & co. kg C d ata sheet r ev. 1 . 0 ? september 2017 49 / 54 physical dimensions package type: to263 - 7 recommended soldering pad recommended stencil de sign thermal pad bottom view side view top view
wpmd h 11 00601 / 171010601 magi 3 c power module vdrm C variable step down regulator module w e - online.com wrth elektronik eisos gmbh & co. kg C d ata sheet r ev. 1 . 0 ? september 2017 50 / 54 packaging reel (mm) 2 0 p
wpmd h 11 00601 / 171010601 magi 3 c power module vdrm C variable step down regulator module w e - online.com wrth elektronik eisos gmbh & co. kg C d ata sheet r ev. 1 . 0 ? september 2017 51 / 54 tape (mm) t o 2 6 3 - 7 e p
wpmd h 11 00601 / 171010601 magi 3 c power module vdrm C variable step down regulator module w e - online.com wrth elektronik eisos gmbh & co. kg C d ata sheet r ev. 1 . 0 ? september 2017 52 / 54 document history revision date description comment 1.0 september 2017 release of the final version
wpmd h 11 00601 / 171010601 magi 3 c power module vdrm C variable step down regulator module w e - online.com wrth elektronik eisos gmbh & co. kg C d ata sheet r ev. 1 . 0 ? september 2017 53 / 54 cautions and warnings the following conditions apply to all goods within the product series of magi3c of wrth elektronik eisos gmbh & co. kg: general: all recommendations according to the general techn ical specifications of the data sheet have to be complied with. the usage and operation of the product within ambient conditions which probably alloy or harm the component surface has to be avoided. the responsibility for the applicability of customer specific products and use in a particular customer design is always with in the authority of the customer. all technical specifications for standard products do a lso apply for customer specific products. residual washing varnish agent that is used during the production to clean the application might change the characteristics of the body, pins or termination. the washing varnish agent could have a negative effect on the long term function of the product. direct mechanical impact to the product shall be prevented as the material of the body, pins or termination could flake or in the worst case it could break. as these devices are sensitive to electrostatic discharge customer shall follow proper ic handling procedures. customer acknowledges and agrees that it is solely responsible for compliance with all legal, regulatory and safety - related requirements concerning its products, and any use of wrth elektronik eisos g mbh & co. kg components in its applications, notwithstanding any applications - related information or support that may be provided by wrth elektronik eisos gmbh & co. kg. customer represents and agrees that it has all the necessary expertise to create and implement safeguards which anticipate dangerous consequences of failures, monitor failures and their consequences lessen the likelihood of failures that might cause harm and take appropriate remedial actions. customer will fully indemnify wrth elektronik eisos and its representatives against any damages arising out of the use of any wrth elektronik eisos gmbh & co. kg components in safety - critical applications. product specific: follow all instructions mentioned in the datasheet, especially: ? the solder p rofile has to comply with the technical reflow or wave soldering specification, otherwise this will void the warranty. ? all products are supposed to be used before the end of the period of 12 months based on the product date - code. ? violation of the technica l product specifications such as exceeding the absolute maximum ratings will void the warranty. ? it is also recommended to return the body to the original moisture proof bag and reseal the moisture proof bag again. ? esd prevention methods need to be followed for manual handling and processing by machinery.
wpmd h 11 00601 / 171010601 magi 3 c power module vdrm C variable step down regulator module w e - online.com wrth elektronik eisos gmbh & co. kg C d ata sheet r ev. 1 . 0 ? september 2017 54 / 54 important notes the following conditions apply to all goods within the product range of wrth elektronik eisos gmbh & co. kg: 1. general customer responsibility some goods within the product range of wrth elektronik eisos gmbh & co. kg contain statements regarding general suitability for certain application areas. these statements about suitability are based on our knowledge and experience of typical requirements concerning the areas, serve as gene ral guidance and cannot be estimated as binding statements about the suitability for a customer application. the responsibility for the applicability and use in a particular customer design is always solely within the authority of the customer. due to this fact it is up to the customer to evaluate, where appropriate to investigate and decide whether the device with the specific product characteristics described in the product specification is valid and suitable for the respective customer application or not . accordingly, the customer is cautioned to verify that the datasheet is current before placing orders. 2. customer responsibility related to specific, in particular safety - relevant applications it has to be clearly pointed out that the possibility of a m alfunction of electronic components or failure before the end of the usual lifetime cannot be completely eliminated in the current state of the art, even if the products are operated within the range of the specifications. in certain customer applications requiring a very high level of safety and especially in customer applications in which the malfunction or failure of an electronic component could endanger human life or health it must be ensured by most advanced technological aid of suitable design of the customer application that no injury or damage is caused to third parties in the event of malfunction or failure of an electronic component. 3. best care and attention any product - specific notes, warnings and cautions must be strictly observed. 4. custom er support for product specifications some products within the product range may contain substances which are subject to restrictions in certain jurisdictions in order to serve specific technical requirements. necessary information is available on request. in this case the field sales engineer or the internal sales person in charge should be contacted who will be happy to support in this matter. 5. product r&d due to constant product improvement product specifications may change from time to time. as a sta ndard reporting procedure of the product change notification (pcn) according to the jedec - standard we inform about minor and major changes. in case of further queries regarding the pcn, the field sales engineer or the internal sales person in charge should be contacted. the basic responsibility of the customer as per section 1 and 2 remains unaffected. 6. product life cycle due to technical progress and economical evaluation we also reserve the right to discontinue production and delivery of products. as a standard reporting procedure of the product termination notification (ptn) according to the jedec - standard we will inform at an early stage about inevitable product discontinuance. according to this we cannot guarantee that all products within our product range will always be available. therefore it needs to be verified with the field sales engineer or the internal sales person in charge about the current product availability expectancy before or when the product for application design - in disposal is consi dered. the approach named above does not apply in the case of individual agreements deviating from the foregoing for customer - specific products. 7. property rights all the rights for contractual products produced by wrth elektronik eisos gmbh & co. kg on the basis of ideas, development contracts as well as models or templates that are subject to copyright, patent or commercial protection supplied to the customer will remain with wrth elektronik eisos gmbh & co. kg. wrth elektronik eisos gmbh & co. kg do es not warrant or represent that any license, either expressed or implied, is granted under any patent right, copyright, mask work right, or other intellectual property right relating to any combination, application, or process in which wrth elektronik ei sos gmbh & co. kg components or services are used. 8. general terms and conditions unless otherwise agreed in individual contracts, all orders are subject to the current version of the general terms and conditions of wrth elektronik eisos group, last version available at www.we - online.com.

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