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light load high efficiency, 31v, buck regulator nr110e series sanken electric co., ltd. oct / 23 /201 2 rev. 1.0 1 http://www.sanken - ele.co.jp general descriptions the nr 110 e series is buck regulator ics integrates high - side power mosfet. the feature increasing efficiency at light loads allows the device to be used in the energy - saving applications. with the current mode control, ultra low esr ca pacitors such as ceramic capacitors can be used. the ics have protection functions such as o ver - c urrent p rotection (ocp) , u nder - v oltage l ockout (uvlo) and t hermal s hutdown (tsd) . an adjustable soft - start by an external capacitor prevents the excessive inru sh current at turn - on. t he ic s integrate phase compensation circuit which reduces the number of external components and simplifies the design of customer application . the on/off pin (en pin ) turns the regulator on or off and helps to achieve low power cons umption requirements. the nr 11 0 e series is available in a n 8 - pin soic package with an exposed thermal pad on the back side. features & benefit s ? current mode pwm control ? up to 94% efficiency, up to 68 % efficiency at i o = 20ma light load ? adjustable over c urrent protection ocp ? current mode pwm control ? stable with low esr ceramic output capacitors ? built - in protection function over current protection (ocp) thermal shutdown (tsd) under voltage lockout (uvlo) ? built - in phase compensation ? adjustable soft - start with an external capacitor ? turn on/of the regulator function package ? exposed soic 8 thermally enhanced 8 - pin package electrical characteristics ? operating input range v in = 6.5 v 31 v ? output adjustable v o = 0.8v 2 4v ? 2a / 4 a output current ? fixed 350khz frequency applications ? lcd tv / blu - ray / set top box ? home appliance ? green electronic products ? other power supply typical application c ircuit arial 10pt k c1, c2: 10 vo v c 1 d 1 c 10 l 1 c 4 r 5 r 6 c 9 r 1 gnd gnd sw v _ s vo _ s in bs sw ss gnd iset fb en 1 3 4 7 2 8 6 5 r 3 r 4 c 2 c 5 r 7 in in nr 111 e
light load high efficiency, 31v, buck regulator nr110e series sanken electric co., ltd. oct / 23 /201 2 rev. 1.0 2 http://www.sanken - ele.co.jp series l ineup product no. f sw v in v o i o nr111 e 350khz 6.5 v to 31v (1 ) 0.8v to 24v (2) 4 a nr119 e 364 khz 2 a ( 1) the minimum input voltage shall be either of 6.5 v or v o +3v, whichever is higher. (2) t he i/o condition limited by the minimum on - time (t on( min ) ). absolute m aximum r atings parameter symbol ratings units condi tions dc input voltage v in 35 v bs pin voltage v bs 44 v bs - sw pin voltage v bs - sw 8 v sw pin voltage v sw 35 v fb pin voltage v fb 5.5 v en pin voltage v en 35 v ss pin voltage v ss 5.5 v power dissipation (3) p d 1.76 w glass - epoxy board mounting in a 3030mm. (copper area in a 2525mm) max t j =150c junction temperature (4) t j ? 40 to 150 c storage temperature t s ? 40 to 150 c thermal resistance (junction - pin no. 4 ) j p 26 c /w thermal resistance (junction - ambient air) ja 71 c /w glass - epoxy board mounting in a 3030mm. (copper area in a 2525mm) (3) limited by thermal shutdown. (4) the temperature detection of thermal shutdown is about 160c recommended operating conditions parameter symbol ratings units conditions min max dc input voltage (5) v in 6.5 31 v dc output current nr111 e (6) (7) io 0 4 .0 a nr119 e 0 2 .0 output voltage vo 0.8 24 v ambient o perating temperature (7) top ? 40 85 c (5) the minimum value of input voltage is taken as the larger on e of either 6.5 v or v o +3v. (6) recommended circuit refer s to typical application circuit . (7) to be used within the allowable package power dissipation characteristics .
light load high efficiency, 31v, buck regulator nr110e series sanken electric co., ltd. oct / 23 /201 2 rev. 1.0 3 http://www.sanken - ele.co.jp electrical c haracteristics ta = 25c parameter symbol ratings units test conditions m i n t y p m a x reference voltage v ref 0.784 0.800 0.816 v v in = 12v i o = 1.0a output voltage temperature coefficient S v ref / S t D 0.05 D mv/c v in = 12v, i o = 1.0a ? 40 c to +85 c switching frequency nr111 e f sw 280 350 420 khz v in =12v, v o =5.0v, i o =1a nr119 e 291 364 437 line regulation (8) v line D 50 D mv v i n = 8 v 3 1 v, v o =5.0v, i o =1a load regulation (8) v load D 50 D mv v in =12v, v o =5.0v, i o =0.1a 2.0a over current protection starting current nr111 e i s1 D 1.5 D a v in =12v, v o = 5.0 v iset=open i s2 D 5.5 D v in =12v, v o = 5.0 v iset=short NR119E i s1 D 0.9 D v in =12v, v o = 5.0 v iset=open i s2 D 2.8 D v in =12v, v o = 5.0 v iset=short supply current i in D 1 D ma v in = 12v v en =10k pull up to v in shutdown supply current i in(off) 0 1 D a v in =12v, i o =0a, v en =0v ss pin source current at low level voltage i en/ss 6 10 14 a v ss =0v, v in =12v en pin sink current i en 20 50 a v en = 10v threshold voltage v c/eh 0.7 1.4 2.1 v v in =12v iset pin o pen voltage v iset 1.5 v v in =12v max on - d uty (8) d max D 90 D % minimum on - time nr111 e (8) t on( min ) D 150 D n sec nr119 e D 150 D thermal shutdown threshold temperature (8) tsd 151 165 D c thermal shutdown restart hysteresis of temperature (8) tsd_hys D 20 D c (8) guaranteed by design, not tested.
light load high efficiency, 31v, buck regulator nr110e series sanken electric co., ltd. oct / 23 /201 2 rev. 1.0 4 http://www.sanken - ele.co.jp typical performance characteristics nr 111 e typical performance characteristics efficiency efficiency [%] output current i o [a] v in =12v 15v 18v 20v 24v v o =3.3v v o =5.0v efficiency [%] output current i o [a] v in =12v 15v 18v 20v 24v 40 50 60 70 80 90 100 0.01 0.1 1 10 40 50 60 70 80 90 100 0.01 0.1 1 10
light load high efficiency, 31v, buck regulator nr110e series sanken electric co., ltd. oct / 23 /201 2 rev. 1.0 5 http://www.sanken - ele.co.jp nr 111 e typical performance characteristics iset=open over current protection output startup v en =0v v o =5.0 v v o =5.0 v , load = constant resistance v o =5.0 v output voltage [v] input voltage v in [v] output current i o [a] input voltage v in [v] output voltage [v] output current i o [a] output voltage v o [v] v in =12v 15v 18v 20v 24v output current i o [a] switching frequency [khz] shutdown supply current [ma] v o =5.0 v supply current [ma] shutdown supply current : i in(off) supply current : i in switching frequency: f sw load regulation : v load output current i o [a] v o =5.0 v iset=gnd 0.00 0.50 1.00 1.50 2.00 2.50 3.00 3.50 4.00 4.50 5.00 5.50 6.00 0.0 1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0 9.0 vo [v] io [a] nr110k/111k ocp. vo=5.0v l=10uh 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 6.5 7.0 4.0 4.5 5.0 5.5 6.0 6.5 7.0 7.5 8.0 8.5 9.0 9.5 10.0 vo[v] vin[v] nr114k uvlo vo=3.3v l=47uh 4.700 4.750 4.800 4.850 4.900 4.950 5.000 5.050 5.100 5.150 5.200 5.250 5.300 0.0 0.5 1.0 1.5 2.0 2.5 3.0 vo [v] io [a] nr116kloadreg. vo=3.3v l=10uh ta=25 200 220 240 260 280 300 320 340 360 380 400 420 440 460 480 500 0.0 1.0 2.0 3.0 4.0 5.0 fosc [khz] io [a] nr110k focs vo=3.3v l=10uh - 0.10 - 0.05 0.00 0.05 0.10 0.15 0.20 0.25 0.30 0.35 0.40 0.0 5.0 10.0 15.0 20.0 25.0 30.0 iin [ma] vin[v] nr110k,111k,114k,115k,116k,117k iq_off 0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 0.0 5.0 10.0 15.0 20.0 25.0 30.0 iin [ma] vin[v] nr114k/115k,nr116k,nr117k iq
light load high efficiency, 31v, buck regulator nr110e series sanken electric co., ltd. oct / 23 /201 2 rev. 1.0 6 http://www.sanken - ele.co.jp functional block diagram pin a ssignments & functions pin assignments pin functions pin no. symbol description 1 bs high - side boost input. bs supplies the drive for high - side nch - mosfet switch. connect a capacitor and a resistor between sw to bs. 2 in power i nput . in supplies the power to the ic as well as the regulator switches 3 sw power s witching o utput . sw supplies power to the output. connect the lc filter from sw to the output. note that a capacitor is required from sw to bs to supp ly the power the high - side switch 4 gnd ground connect the exposed pad to pin no.4 5 fb feedback input pin to compare reference voltage . the feedback threshold is 0.8v. to set the output voltage, fb pin is required to connect between resistive voltage di vider r 4 and r6 . 6 iset adjust pin of ocp starting current ocp starting current can be adjusted by connecting a resistor to iset pin. in the case of using at maximum io , iset pin is required to connect to gnd. 7 en enable input. drive en pin high to turn on the regulator, low to turn it off. 8 ss soft - start control input. to set the soft - start period, connect to a capacitor between gnd. p . reg current sense amp osc drive reg pwm logic bs sw fb iset en err amp in v in v o 0 . 8 v c 10 l 1 d 1 7 6 5 3 1 2 gnd 4 r 6 8 ss ocp on / off vref 0 . 8 v c 9 uvlo ss tsd d 2 option ) r 1 compensation r 3 iset ocp _ ref ocp _ ref ovp fb fb c 1 c 2 c 4 c 5 r 4 r 5
light load high efficiency, 31v, buck regulator nr110e series sanken electric co., ltd. oct / 23 /201 2 rev. 1.0 7 http://www.sanken - ele.co.jp typical a pplication c ircuit external components design guide (1)diode d1 ? the schottky - barrier diode must be used for d1. if other diodes like fast recovery diodes are used, ic may be damaged because of the reverse voltage applied by the recovery voltage or on voltage. (2)choke coil l1 ? if the winding resistance of the choke coil is too high, the efficiency may go down to the extent that it is out of the rating. ? as the start current of the over current protection is approximately 4a, attention must be paid to the heating of the choke coil by the magnetic saturation due to ove rload or short - circulated load. (3)capacitor c1 ( c2 ) , c4 (c5), c9 ? as large ripple current across c1 (c2) and c4 (c5) , capacitors with high frequency and low impedance for smps must be used. especially when the impedance of c4 (c5) is high, the switching w aveform may not be normal at low temperature. ? c9 is a capacitor for soft start. in case soft start function is not used, please keep pin no.2 open. (4)resistor r1, r2 ? r4 , r5 , r6 are resistor to the output voltage. i adj is required to set to 0.2ma. r4 , r5 , r6 are calculated by the equation (1). ------- (1) in order to have optimum operating condition, each component must be connected with the minimum distance. c1, c2: 10 vo v c 1 d 1 c 10 l 1 c 4 r 5 r 6 c 9 r 1 gnd gnd sw v _ s vo _ s in bs sw ss gnd iset fb en 1 3 4 7 2 8 6 5 r 3 r 4 c 2 c 5 r 7 in in nr 111 e ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? k 0 . 4 3 10 2 . 0 8 . 0 adj i fb v 6 r 3 10 2 . 0 8 . 0 o v adj i fb v o v 5 r 4 r P
light load high efficiency, 31v, buck regulator nr110e series sanken electric co., ltd. oct / 23 /201 2 rev. 1.0 8 http://www.sanken - ele.co.jp allowable package power dissipation notes 1) glass - epoxy board mounting in a 3030mm 2) c o pper area : 2525mm 3) the power dissipation is calculated at the junction temperature 125 c 4) losses can be calculated by the following equation. as th e efficiency is subject to the input voltage and output current, it shall be obtained from the efficiency curve and substituted in percent 5) thermal design for d1 shall be made separately. v o : output voltage v in : input voltage i o : output current f : diode forward voltage sjpb - l4 o =3a) ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? in v o v 1 o i f v 1 x 100 o i o v d p
light load high efficiency, 31v, buck regulator nr110e series sanken electric co., ltd. oct / 23 /201 2 rev. 1.0 9 http://www.sanken - ele.co.jp pcb layout & recommended land pattern (1)each ground of all components is connected as close as possible to the pin no.1 at one point. (2) to help heat dissipation , connect a large copper plane to exposed pad on the back side of the package. the copper plane is required for gnd notes: r eal size of the pcb is 60mm 60 mm notes: 1) dimension is in millimeters , dimension in bracket is in inches. 2) drawing is not to scale. front side: component side (double sided board) back side: gnd side (double sided board) recommended land pattern 0.61 (0.024) 1.27 (0.050) 2.35 (0.092) 5.40 (0.213) 3.24 (0.127) 1.60 (0.063)
light load high efficiency, 31v, buck regulator nr110e series sanken electric co., ltd. oct / 23 /201 2 rev. 1.0 10 http://www.sanken - ele.co.jp package outline exposed soic8 package an outside size is supplied by either pa ckage type a o r package type b . package outline, dimensions notes: 1) dimension is in millimeters , dimension in bracket is in inches. 2) drawing is not to scale. 3) pb - free : device composition compl y with the rohs di rective. symbol package a package b min typ max min typ max a1 0
light load high efficiency, 31v, buck regulator nr110e series sanken electric co., ltd. oct / 23 /201 2 rev. 1.0 11 http://www.sanken - ele.co.jp package marking nr 1 1 1e sk ymw part number lot number sanken control number y= last digit of the year (0 - 9) m= month (1 - 9, o, n, or d) w= week code (1 - 3) xxxx
light load high efficiency, 31v, buck regulator nr110e series sanken electric co., ltd. oct / 23 /201 2 rev. 1.0 12 http://www.sanken - ele.co.jp o perating precautions r eliability can be affected adversely by improper storage environment s and handling methods . p lease observe the following cautions. heat dissipation and reliability thermal performance of the surface mo unt package ic depends on th e material and area size of pcb a nd its copper plane. design thermal condition with sufficient margin parallel operation the parallel operation to increase the current is not available. thermal shut down the nr111e ha s a thermal protection circuit. this circuit protects the ic from the heat generation by the over load. this circuit cannot guarantee the long - term reliability against the continuously over load statu s. cautions for storage ? ensure that storage conditions comply with the standard temperature (5 to 35 c ) and the standard relative humidity (around 40 to 75%) ; avoid storage locations that experience extreme changes in temperature or humidity. ? avoid locations where dust or harmful gases are present and avoid direct sunlight. ? reinspect for rust on leads and solderability of products that have been stored for a long time. cautions for testing and handling ? when tests are carried out during inspection testing and other standard test periods, protect the products from power surges from the testing products, shorts between the product pins, and wrong connections. in addition, avoid tests exceeded ratings soldering when soldering the products, please be sure to minimize the working time, within the following limits. ? reflow preheat ; 180 c / 9 0 30 s heat ; 250 c / 10 1s (260 c peak ,2times) ? soldering iron ; 38010c / 3 .5 0.5 s ( 1time ) electrostatic discharge ? when handling the products, the operator must be grounded. grounded wrist straps worn should have at least 1m of resistance from the operator to ground to prevent shock hazard, and it should be placed near the operator. ? workbenches where the products are handled should be grounded and be provided with conductive table and floor mats. ? when using measuring equip ment such as a curve tracer, the equipment should be grounded. ? when soldering the products, the head of a soldering irons or the solder bath must be grounded in order to prevent leak voltages generated by them from being applied to the products. ? the produ cts should always be stored and transported in sanken shipping containers or conductive containers, or be wrapped in aluminum foil.
light load high efficiency, 31v, buck regulator nr110e series sanken electric co., ltd. oct / 23 /201 2 rev. 1.0 13 http://www.sanken - ele.co.jp i m portants notes ? the contents in this document are subject to changes, for improvement and other purposes, without notice. make sure that this is the latest revision of the document before use. ? application and operation examples described in this document are quoted for the sole purpose of reference for the use of the products herein and sanken can assume no responsibility fo r any infringement of industrial property rights, intellectual property rights or any other rights of sanken or any third party which may result from its use. ? although sanken undertakes to enhance the quality and reliability of its products, the occurrence of failure and defect of semiconductor products at a certain rate is inevitable. users of sanken products are requested to take, at their own risk, preventative measures including safety design of the equipment or systems against any possible injury, deat h, fires or damages to the society due to device failure or malfunction. ? sanken products listed in this document are designed and intended for the use as components in general purpose electronic equipment or apparatus (home appliances, office equipment, te lecommunication equipment, measuring equipment, etc.). when considering the use of sanken products in the applications where higher reliability is required (transportation equipment and its control systems, traffic signal control systems or equipment, fire /crime alarm systems, various safety devices, etc.), please contact your nearest sanken sales representative to discuss, prior to the use of the products herein. the use of sanken products without the written consent of sanken in the applications where extremely high reliability is required (aerospace equipment, nuclear power c ontrol systems, life support systems, etc.) is strictly prohibited. ? in the case that you use sanken semiconductor products or design your products by using sanken semiconductor products , the reliability largely depends on the degree of derating to be made to the rated values. derating may be interpreted as a case that an operation range is set by derating the load from each rated value or surge voltage or noise is considered for derating in order to assure or improve the reliability. in general, derating fa ctors include electric stresses such as electric voltage, electric current, electric power etc., environmental stresses such as ambient temperature, humidity etc. and thermal stress caused due to self - heating of semiconductor products . for these stresses, instantaneous values, maximum values and minimum values must be taken into consideration. in addition, it should be noted that since power devices or ics including power devices have large self - heating value, the degree of derating of junction temperatur e affects the reliability significantly. ? when using the products specified herein by either (i) combining other products or materials therewith or (ii) physically, chemically or otherwise processing or treating the products, please duly consider all possib le risks that may result from all such uses in advance and proceed therewith at your own responsibility. ? anti radioactive ray design is not considered for the products listed herein. ? sanken assumes no responsibility for any troubles, such as dropping produ cts caused during transportation out of sanken s distribution network . ? the contents in this document must not be transcribed or copied without sankens written consent.

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