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light load high efficiency , 31 v, current mode step - down 4a switcing regulator ic NR111D sanken electric co., ltd. oct. / 17 /201 3 rev. 1 . 1 1 http://www.sanken - ele.co.jp general descriptions t he nr11 1d is buck regulator ics integrates high - side power mosfet s . 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 capacito rs 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 inrush cur rent 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 consumptio n requirements. the nr11 1d is available in a n 8 - pin dip package. features & benefit s ? current mode pwm control ? up to 94% efficiency, up to 68% efficiency at i o = 20ma light load ? stable with low esr ceramic output capacitors ? built - in protection function ove r 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 ? dip8 package electrical char acteristics ? 4 a output current ? operating input range v in = 6.5 v 31 v ? output adjustable v o = 0.8v 2 4v ? fixed 350khz frequency application s ? lcd tv / blu - ray / set top box ? home appliance ? green electronic products ? other power supply typical application c ircuit arial 10pt k NR111D bs in sw gnd ss en iset fb 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 , 31 v, current mode step - down 4a switcing regulator ic NR111D sanken electric co., ltd. oct. / 17 /201 3 rev. 1 . 1 2 http://www.sanken - ele.co.jp series l ineup p roduct no. f sw v in v o i o NR111D 350khz 8v to 31v (1) 0.8v to 24v (2) 4a ( 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 is limited by the minimum on - tim e ( t on( min ) ). absolute m ax imum r atings ? ? ? g 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 1.47 w glass - e poxy board mounting in a 7 0 6 0mm. (copper area in a 1310 mm 2 ) max t j =150c junction temperature (4) t j ? 3 0 to 150 c storage temperature t s ? 40 to 150 c thermal resistance (junction - pin no. 7 ) j p 41 c /w thermal resistance (junction - ambient air) ja 85 c /w glass - epoxy board mounting in a 7 0 6 0mm. (copper area in a 1310 mm 2 ) (3) limited by thermal shutdown. (4) the temperature detection of thermal shutdown is about 160c recommended o perating c onditions parameter symbol ratings units condi tions min max dc input voltage (5) v in vo+3 31 v dc output current (6) (7) io 0 4 .0 a 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 one of either 6.5v or vo +3v. (6) recommended circuit refer to typical application circuit (p.7) . (7) to be used within the allowable package power dissipation characteristics (p.9)
light load high efficiency , 31 v, current mode step - down 4a switcing regulator ic NR111D sanken electric co., ltd. oct. / 17 /201 3 rev. 1 . 1 3 http://www.sanken - ele.co.jp electrical c haracteristics ta = 25c parameter symbol ratings units test conditions m i n t y p max 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 ? 40c to +85c switchi ng frequency f sw 280 350 420 khz v in =12v, v o =5.0v, i o =1a line regulation (8) v line D 50 D mv v in = 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 overcurrent protection threshold 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 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 (8) t on( min ) D 150 D nsec thermal shutdown t hreshold 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. the input and output cond ition is limited by minimum on - time.
light load high efficiency , 31 v, current mode step - down 4a switcing regulator ic NR111D sanken electric co., ltd. oct. / 17 /201 3 rev. 1 . 1 4 http://www.sanken - ele.co.jp typical characteristics (1) effi ciency output curr ent i o [a] v in =6.5 v 8 v 12v 24v [%] efficiency output current i o [a] v in =8 v 12 v 24v [%] efficiency v in =2 4v output current i o [a] [%] efficiency 50 60 70 80 90 100 0.01 0.1 1 10 NR111D vo=12v 30 40 50 60 70 80 90 100 0.01 0.1 1 10 NR111D vo=5v 30 40 50 60 70 80 90 100 0.01 0.1 1 10 NR111D vo=3.3v
light load high efficiency , 31 v, current mode step - down 4a switcing regulator ic NR111D sanken electric co., ltd. oct. / 17 /201 3 rev. 1 . 1 5 http://www.sanken - ele.co.jp (5) over current protection (2) output start - up load=cr (3) load regulation : v load (6) supply current : i in a t no - load (4) shut down supply current : i in(off) (7 ) switching frequency : fsw v o =3.3v output current i o [a] input voltage vin [v] output voltage v o [v] iset=open iset=short input voltage vin [v] output current i o [a] output voltage v o [v] input current iin [ma] input voltage v in [v] input current iin [ma] output current i o [a] frequency f osc [khz] v in =1 2v 15v 20v 24v v en =0v v o =5.0 v vin=8v 12v 24v output voltage v o [v] 4.9 4.92 4.94 4.96 4.98 5 5.02 5.04 5.06 5.08 5.1 0 1 2 3 4 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 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 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
light load high efficiency , 31 v, current mode step - down 4a switcing regulator ic NR111D sanken electric co., ltd. oct. / 17 /201 3 rev. 1 . 1 6 http://www.sanken - ele.co.jp functional block d iagram pin assignment & functions pin assign pin assign & 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 npu t . 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 supply the power the high - sid e 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 divider r4 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 , 31 v, current mode step - down 4a switcing regulator ic NR111D sanken electric co., ltd. oct. / 17 /201 3 rev. 1 . 1 7 http://www.sanken - ele.co.jp example application circuit a design guide of external components (1)diode d1 ? the schottky - barrier diode must be used for d1. if other diodes like fast recovery diodes are used, ic may be destroyed because of the reverse voltage applied by the recovery voltage or on voltage. (2)choke coil l1 ? if the winding resistance of the chok e 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 overload or short - circulated load. (3)capacitor c1( c2), c4(c5), c9 ? as large ripple currents 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 waveform 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 r4, r5,r6 ? r4, r5, r6 are resistor to the output voltage. iadj is required to set to 0.2ma. r4, r5, r6 are calculated by the equation (1). ------- (1) NR111D c1, c2: 10 f / 35v r1: 1.7m l1 : 10 h c4, c5: 22 f / 16v r3: 22 c9: 0.1 f r4: 18k , r5: 2.7k (vo=5.0v) c10: 0.1 f r6: 3.9k i fb :the electric current which flows to r6 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 i v r v i v v r r fb fb o fb fb o 0 . 4 10 2 . 0 8 . 0 6 10 2 . 0 8 . 0 5 4 3 3 P
light load high efficiency , 31 v, current mode step - down 4a switcing regulator ic NR111D sanken electric co., ltd. oct. / 17 /201 3 rev. 1 . 1 8 http://www.sanken - ele.co.jp (5)resistor r7 ? r7 is resistor to adjust ocp starting current . the graph shows the relationshi p between r7 and ocp . the ocp output current is calculated in terms of the equation (2),(3),(4) * ip becomes the peak value of inductor ripple current. calculate it in accordance with the following equation. in case of continuous inductor current ??? ------- ( 2 ) in case of discontinuous inductor current ??? ------ ( 3 ) * inductor ripple current ???? ------- ( 4 ) in order to have optimum operating condition, each component must be connected with the minimum distance. vin S 100k 1m 10m 100m 0.00 1.00 2.00 3.00 4.00 5.00 6.00 7.00 8.00 10 100 1000 10000 100000 ^_? ?` [a] ^_? O? rset [k] riset - ilpeak O _max O _min ? ? ? ? ? ? S ip il ip ) vo - (v vo 2 v in in ? ? ? ? ? ? ? ? ? l io S S il ip il ? S in v vo - (1 l vo il ? ? ?
light load high efficiency , 31 v, current mode step - down 4a switcing regulator ic NR111D sanken electric co., ltd. oct. / 17 /201 3 rev. 1 . 1 9 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 the 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 volt age 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 , 31 v, current mode step - down 4a switcing regulator ic NR111D sanken electric co., ltd. oct. / 17 /201 3 rev. 1 . 1 10 http://www.sanken - ele.co.jp pcb layout recommendation *the demonstration printed circuit board. i t can mount a part for the experiment , exc ept for the example a pplication circuit . note 1) s ize of the pcb is about 40 mm 40 mm 2) dimension is i n millimeters , dimension in bracket is in inches. 3) drawing is not to scale. front side: component side (double sided board) back side: gnd side (double sided board) 8 0.8 (reference) dip8 package about the position of the lead - insertion hole
light load high efficiency , 31 v, current mode step - down 4a switcing regulator ic NR111D sanken electric co., ltd. oct. / 17 /201 3 rev. 1 . 1 11 http://www.sanken - ele.co.jp package outline & dimension an outside size is supplied by either pa ckage type a or package type b . package a note: 1) dimension is in millimeters . 2) drawing is not to scale. NR111D *2 sk *3 *1 *4 9.4 0.127 6.35 0.127 1.524 1.524 3.302 0. 254 3.302 0.127 1.524 0.381min 2.54 0.356~0.559 7.938 0. 3175 6.35 0.127 0.2032~0.3810 8.636 0. 762 mariking *1. type number *2. lot number (three digit) 1 st letter: the last digit of year 2 nd letter: month (1 to 9 for jan. to sept., o for oct. n for nov. d for dec.) 3 rd letter week 01 03 arabic numerical *3. control number (four digit) *4 .logo: sk pin assignment 1.nc 2.in 3.sw 4.gnd 5.fb 6.en 7.ss 8.bs
light load high efficiency , 31 v, current mode step - down 4a switcing regulator ic NR111D sanken electric co., ltd. oct. / 17 /201 3 rev. 1 . 1 12 http://www.sanken - ele.co.jp 9.2 0.2 6.4 0.2 4.01 0.3 3.3 0.3 (1.524) (2.54) 0.475 0.095 7.62 0.3 8.7 0.3 0.282 0.078 nr111 d *2 sk *3 *1 pin assignment 1.nc 2.in 3.sw 4.gnd 5.fb 6.en 7.ss 8.bs package b 3.4 0.2 0.51min *4 note: 1) dimension is in millimeters . 2) drawing is not to scale. marking *1. type number *2. lot number (three digit) 1 st letter: the last digit of year 2 nd letter: month (1 to 9 for jan. to sept., o for oct. n for nov. d for dec.) 3 rd letter week 01 03 arabic numerical *3. control number (four digit) *4 .logo: sk
light load high efficiency , 31 v, current mode step - down 4a switcing regulator ic NR111D sanken electric co., ltd. oct. / 17 /201 3 rev. 1 . 1 13 http://www.sanken - ele.co.jp o perating precautions r eliability can be affected adversely by improper storage environment s and hand ling 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 par allel operation the parallel operation to increase the current is not available. thermal shut down the NR111D has a thermal protection circuit. this circuit protects the ic from the heat generation by the over load. this circuit cannot guarantee the lon g - 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 experienc e 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 han dling ? 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 discha rge ? 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 equipment such as a curve tracer, the equipment should be grounded. ? when soldering the products, the head of a soldering irons or the solder bath m ust be grounded in order to prevent leak voltages generated by them from being applied to the products. ? the products should always be stored and transported in sanken shipping containers or conductive containers, or be wrapped in aluminum foil.
light load high efficiency , 31 v, current mode step - down 4a switcing regulator ic NR111D sanken electric co., ltd. oct. / 17 /201 3 rev. 1 . 1 14 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 ar e quoted for the sole purpose of reference for the use of the products herein and sanken can assume no responsibility for any infringement of industrial property rights, intellectual property rights or any other rights of sanken or any third party which ma y 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 the ir own risk, preventative measures including safety design of the equipment or systems against any possible injury, death, fires or damages to the society due to device failure or malfunction. ? sanken products listed in this document are designed and intend ed for the use as components in general purpose electronic equipment or apparatus (home appliances, office equipment, telecommunication equipment, measuring equipment, etc.). when considering the use of sanken products in the applications where higher reli ability 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 us e 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 control systems, life support systems, etc.) is strictly prohibi ted. ? 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 factors include electric stresses such as electric voltage, elect ric 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 mi nimum 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 temperature affects the reliability significantly. ? wh en 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 possible 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 products caused during transportation out of san ken s distribution network . ? the contents in this document must not be transcribed or copied without sankens written consent.

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