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asm8p18s42 / asm8p18s42er asm8p1843 / asm8p18s43er june 2005 asm8p18s44er / asm8p18s45er rev 0.6 notice: the information in this document is subject to change without notice. alliance semiconductor 2575 augustine drive santa clara, ca tel: 408.855.4900 fax: 408.855.4999 voltage mode pwm controller with emi reduction general description asm8p18xx is a high performance, adjustable frequency, pwm controller with an integrated spread spectrum modulator for emi reduction. it contains all the functions of a standard pwm controller along with a user configurable spread spectrum modulation with adjustable spread. asm8p18xx allows significant system cost savings by reducing the number of pcb layers and shielding that are traditionally required to pass emi regulation. asm8p18xx is the industry?s first general purpose emi reduction ic, specifically designed for use in smps systems. asm8p18xx is compatible to any other 3842 pwm controllers. asm8p18xx is capable of driving 1a maximum current output and it covers a wide supply voltage range from 7v dc to 30v dc. the pwm frequency is selectable from 40 khz to 400 khz. asm8p18xx provides under voltage lockout, thermal shutdown, overload, and undercurrent protection. it is available in 8-pin microso, p-dip and soic package. features 30v maximum operating voltage with cmos technology adjustable pwm frequencies (40 khz to 400 khz) maximum output drive current of 1a. wide duty cycle range (0% minimum to 95% maximum) spread spectrum modulation with adjustable spread. under voltage lockout with hysteresis. low startup current: 275 ? a maximum pin compatible with industry standard 3842 pwm controller. temperature range ?40 c to +85 c. thermal shutdown, overload and undercurrent protection. frequency skip mode. available in 8-pin plastic microso, p-dip and soic packages. applications off-line converter dc-dc converter monitor power supply computer/dvd/stb power supply wireless base station power supply telecom power supply typical operating circuit v dd v dd v in fsel gnd c t v ref out comp r c c c r 1 r 2 from smps output r s i sns fb r d r 3 asm8p18xx
asm8p18s42 / asm8p18s42er asm8p1843 / asm8p18s43er june 2005 asm8p18s44er / asm8p18s45er rev 0.6 voltage mode pwm controller with emi reduction 2 of 11 notice: the information in this document is subject to change without notice. logic block diagram pin diagram 8-pin microso, p-dip and soic pin description pin # pin name function 1 comp input of the pwm comparator and output of the error amplifier 2 fb feedback, inverting input of the error amplifier 3 i sns current sense comparator input 4 fsel external capacitor selects pwm frequency 5 gnd ground 6 out ss modulated pwm output 7 v dd supply voltage 8 v ref / r d 5v output for asm8pi8s42 and asm8pi843 parts. external resistor ? r d ? to gnd sets the modulation spread for the parts with er suffix. i sns gnd pwm ss mo d control ol + uc sense uvlo thermal shutdown v bg driver error amp comp fb out v ref v dd f sel 1 2 3 4 8 7 6 5 asm8p18s42 comp fb i sns f sel gnd out v dd v ref asm8p1843 comp 1 2 3 4 8 7 6 5 fb i sns f sel gnd out v dd r d asm8p18s42er asm8p18s43er asm8p18s44er asm8p18s45er
asm8p18s42 / asm8p18s42er asm8p1843 / asm8p18s43er june 2005 asm8p18s44er / asm8p18s45er rev 0.6 voltage mode pwm controller with emi reduction 3 of 11 notice: the information in this document is subject to change without notice. application information spread spectrum deviation the deviation can be determined by selecting the proper resistor at v ref to gnd for the parts with ?er? suffix. (refer ?r d resistor vs. % modulation depth plot? for resistor selection) pwm frequency the pwm frequency can be determined by selecting the proper capacitance (c t ) at the fsel pin. start-up current asm8p18xx allows a substantial reduction in the start up current. low start up current allows high resistance, lower wattage start-up resistor, to supply controller start up power. under voltage lockout (uvlo) when the power supply voltage is below the start up threshold voltage, internal circuitry puts the output into low impedance state and sets the output to zero. thermal shutdown the output of asm8p18xx goes down to zero when the junction temperature of the device rises above 155c. the device automatically resumes operation when temperature drops to 126c. this protects the device from thermal breakdown. overload and under current protection asm8p18xx provides cycle by cycle current limit and pulls down pwm output to low as soon as i sns pin senses a peak voltage of 1v, with a delay to output of 125 ns maximum. at no load condition when the device senses the peak voltage level of less than 0.1v at i sns pin for a period of 200ms, the oscillator enters in to cycle skip mode. normal condition is restored once i sns increases beyond 0.1v for more than three cycles. details of cycle skip for different options are provided in the electrical characteristics table. absolute maximum ratings symbol parameter min max units v dd supply voltage 30 v i dd supply current tbd* ma i out maximum output current 1 a i sns current sense inputs and feedback i sns, fb, comp 5 v v ref reference voltage 6 v v osc oscillator voltage 4 v v out output voltage 30 v operation junction temperature -45 150 c storage temperature -65 150 c lead soldering temperature (10 seconds) 300 c static discharge voltage mil-std-883 2 kv *maximum output voltage = 30v
asm8p18s42 / asm8p18s42er asm8p1843 / asm8p18s43er june 2005 asm8p18s44er / asm8p18s45er rev 0.6 voltage mode pwm controller with emi reduction 4 of 11 notice: the information in this document is subject to change without notice. electrical characteristics u nless otherwise noted, v d d = 15v, capacitor on f s el = 330pf, i s ens = 0.5v. specifications are over the ?40c to +85c ambient temperature range. typical values are at 25c. parameter symbol conditions min typ max units reference section asm8p18s42 & asm8p1843 output voltage v ref t a = +25c, i out = 1ma 4.90 5.00 5.1 v line regulation n v ref 12v < v dd < 18v, i out = 5 ? a 25 mv total reference variation line, temperature 0.7 % temperature stability tc ref 0.5 mv/c load regulation (asm8p1843) ima < io < 20ma 25 mv error amplifier section input bias current i bias -20 ? a input voltage v i v pin1 = 1.25v 1.2 1.25 1.3 v open loop voltage gain a vol 65 db power supply rejection ratio psrr v start < v cc < v cc max 80 db output sink current i ol v fb = 1.32v, v comp = 0.15v -1.5 ma output source current i oh v fb = 1.18v, v comp = 4.17v 0.3 ma high output voltage v oh v fb = 1.25v, r l = 15k p 4.17 v low output voltage v ol v fb = 1.25v 0.15 v current sense section over current protection threshold v i(max) fb = 0v (v comp = 5v) 0.90 1.00 1.10 v delay to output t pd v fb = 0v, i sns = 0 to 2v 125 ns under current sense period t ucs 200 ms under current recovery period t ucsd 3 cycles of pwm frequency asm8p18s42, asm8p18s42er 1/4 asm8p1843 asm8p18s43er asm8p18s44er 1/10 cycle skip cycle skip condition: i sens r 0.1v asm8p18s45er no skip x f s output section low output voltage v ol i sink = 50ma i sink = 200ma 0.128 0.470 v high output voltage v oh i source = 50ma i source = 200ma at v dd =15v 14.71 13.77 v on resistance, high r ds(on)h i source = 0.2a 6.5 p on resistance, low r ds(on)l i sink = 0.2a 2.5 p
asm8p18s42 / asm8p18s42er asm8p1843 / asm8p18s43er june 2005 asm8p18s44er / asm8p18s45er rev 0.6 voltage mode pwm controller with emi reduction 5 of 11 notice: the information in this document is subject to change without notice. p arameter s ymbol c onditions m in t yp m ax u nits rise time t r t a = 25c, c l =1nf 30 ns fall time t f t a = 25c, c l =1nf 30 ns shoot through current 0 uvlo section asm8p1843, asm8p18s43er, asm8p18s45er, 7.8 start threshold v th(start) asm8p18s42, asm8p18s42er asm8p18s44er 15.4 v asm8p1843, asm8p18s43er, asm8p18s45er 6.7 v stop threshold v th(stop) asm8p18s42, asm8p18s42er, asm8p18s44er 10.2 pwm section pwm frequency f s 40 400 khz asm8p18s44er, asm8p18s45er 0 50 duty cycle range asm8p18s42, asm8p18s42er, asm8p1843, asm8p18s43er 0 95 % total device start up current i st 275 ? a peak output current i out(pk) 1000 ma operating current i cc(opr) v fb = 0; i sns = 0.5; v dd = 15v 5 6 ma thermal shutdown v z junction temp 155 c thermal recovery 126 c spread spectrum section asm8p18s43er, asm8p18s45er 1/20 modulation rate asm8p18s42, asm8p18s42er, asm8p18s44er 1/10 of switching frequency (khz) modulation depth refer r d resistor vs. % modulation depth plot oscillator section frequency change with voltage df/d v cc 0.04 0.05 % oscillator amplitude 1.66 v (pk-pk) temperature stability t osc 0.1 %/ c
asm8p18s42 / asm8p18s42er asm8p1843 / asm8p18s43er june 2005 asm8p18s44er / asm8p18s45er rev 0.6 voltage mode pwm controller with emi reduction 6 of 11 notice: the information in this document is subject to change without notice. frequency selection curve 0 100 200 300 400 500 600 700 15 30 47 62 100 147 220 330 550 ct (pf) f s ( k h z ) r d resistor vs % modulation depth plot 0 2 4 68 10 12 14 16 0.51 1 2.2 6.8 10 20 rd (m ohms) + / - m d ( % o f f s ) fs=40khz fs=400khz
asm8p18s42 / asm8p18s42er asm8p1843 / asm8p18s43er june 2005 asm8p18s44er / asm8p18s45er rev 0.6 voltage mode pwm controller with emi reduction 7 of 11 notice: the information in this document is subject to change without notice. package information 8-lead msop package dimensions inches millimeters symbol min max min max a 0.032 0.044 0.81 1.10 a1 0.002 0.006 0.05 0.15 a2 0.030 0.038 0.76 0.97 b 0.012 bsc 0.30 bsc c 0.004 0.008 0.10 0.20 d 0.114 0.122 2.90 3.10 e 0.0256 bsc 0.65 bsc e1 0.114 0.122 2.90 3.10 e 0.184 0.200 4.67 5.08 l 0.016 0.026 0.41 0.66 u 0 6 0 6 s 0.0206 bsc 0.52 bsc
asm8p18s42 / asm8p18s42er asm8p1843 / asm8p18s43er june 2005 asm8p18s44er / asm8p18s45er rev 0.6 voltage mode pwm controller with emi reduction 8 of 11 notice: the information in this document is subject to change without notice. 8-lead (150-mil) soic package d e h d a 1 a 2 a l c b e dimensions inches millimeters symbol min max min max a1 0.004 0.010 0.10 0.25 a 0.053 0.069 1.35 1.75 a2 0.049 0.059 1.25 1.50 b 0.012 0.020 0.31 0.51 c 0.007 0.010 0.18 0.25 d 0.193 bsc 4.90 bsc e 0.154 bsc 3.91 bsc e 0.050 bsc 1.27 bsc h 0.236 bsc 6.00 bsc l 0.016 0.050 0.41 1.27 u 0 8 0 8
asm8p18s42 / asm8p18s42er asm8p1843 / asm8p18s43er june 2005 asm8p18s44er / asm8p18s45er rev 0.6 voltage mode pwm controller with emi reduction 9 of 11 notice: the information in this document is subject to change without notice. 8-lead pdip package dimensions inches millimeters symbol min max min max a 0.210 5.33 a1 0.015 0.38 a2 0.115 0.195 2.92 4.95 b 0.014 0.022 0.36 0.56 b2 0.045 0.070 1.14 1.78 c 0.008 0.014 0.20 0.36 d 0.355 0.400 9.02 10.16 e 0.300 0.325 7.62 8.26 e1 0.240 0.280 6.10 7.11 e 0.10 bsc 2.54 bsc eb 0.430 10.92 l 0.115 0.150 2.92 3.81
asm8p18s42 / asm8p18s42er asm8p1843 / asm8p18s43er june 2005 asm8p18s44er / asm8p18s45er rev 0.6 voltage mode pwm controller with emi reduction 10 of 11 notice: the information in this document is subject to change without notice. ordering information asm ordering part number package operating temp range start- up voltage minimum operating voltage maximum duty cycle modulation depth control peak output current package top mark asm8i18s42erf-08-px 8-pdip -45 to 85c 15.4v 10.2v 95 external r 1a 8i18s42erf asm8i18s42erf-08-mx 8-msop -45 to 85c 15.4v 10.2v 95 external r 1a 8i18s42erf asm8i18s42erf-08-sx 8-soic -45 to 85c 15.4v 10.2v 95 external r 1a 8i18s42erf asm8p18s42erf-08-px 8-pdip 0 to 70c 15.4v 10.2v 95 external r 1a 8p18s42erf asm8p18s42erf-08-mx 8-msop 0 to 70c 15.4v 10.2v 95 external r 1a 8p18s42erf asm8p18s42erf-08-sx 8-soic 0 to 70c 15.4v 10.2v 95 external r 1a 8p18s42erf asm8i18s43erf-08-px 8-pdip -45 to 85c 7.8v 6.7v 95 external r 1a 8i18s43erf asm8i18s43erf-08-mx 8-msop -45 to 85c 7.8v 6.7v 95 external r 1a 8i18s43erf asm8i18s43erf-08-sx 8-soic -45 to 85c 7.8v 6.7v 95 external r 1a 8i18s43erf asm8p18s43erf-08-px 8-pdip 0 to 70c 7.8v 6.7v 95 external r 1a 8p18s43erf asm8p18s43erf-08-mx 8-msop 0 to 70c 7.8v 6.7v 95 external r 1a 8p18s43erf asm8p18s43erf-08-sx 8-soic 0 to 70c 7.8v 6.7v 95 external r 1a 8p18s43erf asm8i18s44erf-08-px 8-pdip -45 to 85c 15.4v 10.2v 50 external r 1a 8i18s44erf asm8i18s44erf-08-mx 8-msop -45 to 85c 15.4v 10.2v 50 external r 1a 8i18s44erf asm8i18s44erf-08-sx 8-soic -45 to 85c 15.4v 10.2v 50 external r 1a 8i18s44erf asm8p18s44erf-08-px 8-pdip 0 to 70c 15.4v 10.2v 50 external r 1a 8p18s44erf asm8p18s44erf-08-mx 8-msop 0 to 70c 15.4v 10.2v 50 external r 1a 8p18s44erf asm8p18s44erf-08-sx 8-soic 0 to 70c 15.4v 10.2v 50 external r 1a 8p18s44erf asm8i18s45erf-08-px 8-pdip -45 to 85c 7.8v 6.7v 50 external r 1a 8i18s45erf asm8i18s45erf-08-mx 8-msop -45 to 85c 7.8v 6.7v 50 external r 1a 8i18s45erf asm8i18s45erf-08-sx 8-soic -45 to 85c 7.8v 6.7v 50 external r 1a 8i18s45erf asm8p18s45erf-08-px 8-pdip 0 to 70c 7.8v 6.7v 50 external r 1a 8p18s45erf asm8p18s45erf-08-mx 8-msop 0 to 70c 7.8v 6.7v 50 external r 1a 8p18s45erf asm8p18s45erf-08-sx 8-soic 0 to 70c 7.8v 6.7v 50 external r 1a 8p18s45erf asm8i18s42f-08-px 8-pdip -45 to 85c 15.4v 10.2v 95 na 1a 8i18s42f asm8i18s42f-08-mx 8-msop -45 to 85c 15.4v 10.2v 95 na 1a 8i18s42f asm8i18s42f-08-sx 8-soic -45 to 85c 15.4v 10.2v 95 na 1a 8i18s42f asm8p18s42f-08-px 8-pdip 0 to 70c 15.4v 10.2v 95 na 1a 8p18s42f asm8p18s42f-08-mx 8-msop 0 to 70c 15.4v 10.2v 95 na 1a 8p18s42f asm8p18s42f-08-sx 8-soic 0 to 70c 15.4v 10.2v 95 na 1a 8p18s42f asm8i1843f-08-px 8-pdip -45 to 85c 7.8v 6.7v 95 na 1a 8i1843f asm8i1843f-08-mx 8-msop -45 to 85c 7.8v 6.7v 95 na 1a 8i1843f asm8i1843f-08-sx 8-soic -45 to 85c 7.8v 6.7v 95 na 1a 8i1843f asm8p1843f-08-px 8-pdip 0 to 70c 7.8v 6.7v 95 na 1a 8p1843f asm8p1843f-08-mx 8-msop 0 to 70c 7.8v 6.7v 95 na 1a 8p1843f ASM8P1843F-08-SX 8-soic 0 to 70c 7.8v 6.7v 95 na 1a 8p1843f note: all alliance semiconductor lead free parts are rohs compliant. all parts are lead free by default. contact factory for non lead free parts. licensed under us patent numbers 5,488,627 and 5,631,921.
asm8p18s42 / asm8p18s42er asm8p1843 / asm8p18s43er june 2005 asm8p18s44er / asm8p18s45er rev 0.6 voltage mode pwm controller with emi reduction 11 of 11 notice: the information in this document is subject to change without notice. ? copyright 2003 alliance semiconductor corporation. all rights reserved. our three-point logo, our name and intelliwatt are trademarks or registered trademarks of alliance. all other brand and product names may be the trademarks of their respective companies. alliance reserves the right to make changes to this document and its products at any time without notice. alliance assumes no responsibility for any errors that may appear in this document. the data contained herein represents alliance's best data and/or estimates at the time of issuance. alliance reserves the right to change or correct this data at any time, without notice. if the product described herein is under development, significant changes to these specifications are possible. the information in this product data sheet is intended to be general descriptive information for potential customers and users, and is not intended to operate as, or provide, any guarantee or warrantee to any user or customer. alliance does not assume any responsibility or liability arising out of the application or use of any product described herein, and disclaims any express or implied warranties related to the sale and/or use of alliance products including liability or warranties related to fitness for a particular purpose, merchantability, or infringement of any intellectual property rights, except as express agreed to in alliance's terms and conditions of sale (which are available from alliance). all sales of alliance products are made exclusively according to alliance's terms and conditions of sale. the purchase of products from alliance does not convey a license under any patent rights, copyrights; mask works rights, trademarks, or any other intellectual property rights of alliance or third parties. alliance does not authorize its products for use as critical components in life-supporting systems where a malfunction or failure may reasonably be expected to result in significant injury to the user, and the inclusion of alliance products in such life-supporting systems implies that the manufacturer assumes all risk of such use and agrees to indemnify alliance against all claims arising from such use. alliance semiconductor corporation 2575, augustine drive, santa clara, ca 95054 tel# 408-855-4900 fax: 408-855-4999 www.alsc.com copyright ? alliance semiconductor all rights reserved preliminary information part number: asm8p18s42 / asm8p18s42er asm8p18s42 / asm8p18s43er asm8p18s44er / asm8p18s45er document version: v0.6 note: this product utilizes us patent # 6,646,463 impedance emulator patent issued to alliance semiconductor, dated 11-11-2003

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