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primary side regulation pwm controller for automotive applications SFA0002 data sheet SFA0002 - dse rev. 1.0 sanken electric co., ltd 1 nov. 17, 2 01 6 http://www.sanken - ele.co.j p/en ? s anken e lectric c o ., l td. 2016 description the SFA0002 is the switching power supply ic for flyback circuit and has high accuracy error amplifier. when the load of the power supply circuit becomes light, the operation of ic becomes the b urst o scillation m ode in order to improve the circuit efficiency . by employing the primary side regulation, the ic realizes low component counts and design - friendline ss, leading to downsizing and standardization of the power supply circuit. features aec - q10 0 qualified current mode type pwm control (swithing frequency can be adjusted by external capacitor ) r educing e xternal c omponent c ount by primary side regulation built - in h igh accuracy e rror a mplifier ( v fb = 2.5 v 2% , ? 40 c to 125c ) operation mode normal operation : pwm mode light load operation : burst oscillation soft start function (startup time can be adjusted by external capacitor) drive output stop function protections : overcurrent protection (ocp) : pulse - by - pulse overload protection ( olp ) : auto - r estart thermal shutdown protection (tsd) with hysteresis: auto - r estart typical application package sop8 not to scale specifications power supply voltage is v cc = 36 v (max.) adjustable swithing frequency ( 20 khz to 200 khz ) application s for following isolation auxiliary power supply: invert e r o n - board c harger ( obc ) battery m anagement s ystem ( bms ), etc. r2 d1 t1 c10 c2 d2 c1 d3 vout (+) c9 r6 q1 r1 1 5 6 7 8 4 2 ocp drive comp freq sfa 0002 ss fb vcc 3 gnd r11 r4 r5 c4 c3 r3 c8 r10 vout (-) r8 r9 c7 r7 c5 c6
SFA0002 SFA0002 - dse rev. 1.0 sanken electric co., ltd 2 nov. 17, 2 01 6 http://www.sanken - ele.co.j p/en ? s anken e lectric c o ., l td. 2016 contents description ------------------------------------------------------------------------------------------------------ 1 contents --------------------------------------------------------------------------------------------------------- 2 1. absolute maximum ratings ----------------------------------------------------------------------------- 3 2. rec ommended operating conditions ----------------------------------------------------------------- 4 3. electrical characteristics -------------------------------------------------------------------------------- 4 4. performance curves -------------------------------------------------------------------------------------- 6 5. block dia gram --------------------------------------------------------------------------------------------- 7 6. pin configuration and definitions --------------------------------------------------------------------- 7 7. typical application --------------------------------------------------------------------------------------- 8 8. physical dimensions -------------------------------------------------------------------------------------- 9 9. marking diagram ----------------------------------------------------------------------------------------- 9 10. timing chart --------------------------------------------------------------------------------------------- 10 important notes ---------------------------------------------------------------------------------------------- 12
SFA0002 SFA0002 - dse rev. 1.0 sanken electric co., ltd 3 nov. 17, 2 01 6 http://www.sanken - ele.co.j p/en ? s anken e lectric c o ., l td. 2016 1. absolute maximum ratings current polaritie s are defined as follows: current going into the ic (sinking) is positive current (+); and current coming out of the ic (sourcing) is negative current (?). unless otherwise specified , t a = 25 c . parameter symbol conditions rating unit remarks ocp pin voltage v ocp ? 5 to 5 v ss pin voltage v ss ? 0.3 to 9 v fb pin voltage v fb ? 0.3 to 5 v vcc pin voltage v cc 0 to 36 v comp pin voltage v comp ? 0.3 to 5 v freq pin voltage v freq ? 0.3 to 5 v drive pin peak current i drv(peak) ? 270 to 540 ma drive pin dc current i drv(dc) ? 90 to 180 ma power dissipation p d * mounting on pcb 1. 2 w junction temperature t j ? 40 to 1 50 c storage temperature t stg ? 40 to 1 50 c * pcb: 42 m m 32 mm in size, 1 mm in thickness
SFA0002 SFA0002 - dse rev. 1.0 sanken electric co., ltd 4 nov. 17, 2 01 6 http://www.sanken - ele.co.j p/en ? s anken e lectric c o ., l td. 2016 2. recommended operating conditions parameter symbol conditions min. typ. max. unit remarks vcc pin voltage v cc 6 ? 24 v switching frequency f osc 20 ? 200 khz 3. electrical characteristics current polarities are defined as follows: current going into the ic (sinking) is positive current (+); and current coming out of the ic (sourcing) is negative current (?). unless otherwise specified , t a = ?40 c to 1 25 c , v cc = 14 v , and fb = ss = ocp = 0 v. the following e lectrical c haracteristics are d esign assurance value in t a = ?40 c to 1 25 c . the shipping test temperature of the product s is ? 30 c , 25 c and 125 c . parameter symbol conditions min. typ. max. unit remarks power supply startup operation operation start voltage v cc(on) 4.9 5.1 5.3 v operation stop voltage v cc(off) 4.4 4.6 4.8 v circuit current in operation i cc(on) 1.0 2.0 3.2 ma circuit current in non - o peration i cc(o ff) vcc = 4.8 v 0.3 0.5 1.0 ma normal operation ss pin high threshold voltage of olp operation v hss 1.9 2.0 2.1 v ss pin low threshold voltage of olp operation v lss 0.9 1.0 1.1 v ss pin voltage hysteresis of olp operation v ss v hss ? v lss 0.9 1.0 1.1 v ss pin source current i src (ss) ss = 0.9 v ? 19 ? 15 ? 11 a ss pin sink current i snk (ss) ss = 2.1 v 13 17 21 a swit c hing frequency f osc(200 p) freq = 200 pf 85 100 115 khz freq pin source current i src(freq) freq = 0.9 v ? 33 ? 30 ? 27 a freq pin sink current i snk (freq) freq = 2.1 v 75 85 95 a oscillation circuit high threshold voltage v hf 1.9 2.0 2.1 v oscillation circuit low threshold voltage v lf 0.9 1.0 1.1 v maximum d uty c ycle d max freq = 200pf 70 74 78 % slope c ompensation r ate slp 2.1 2.5 2.9 mv/% feedback voltage v fb 2.45 2.50 2.55 v burst operation threshold voltage v burst freq = 200pf, comp pin voltage increase from 0 v. ? 0.18 ? v drive voltage v drive freq = 3 v, one pulse 7.6 8.3 9.0 v
SFA0002 SFA0002 - dse rev. 1.0 sanken electric co., ltd 5 nov. 17, 2 01 6 http://www.sanken - ele.co.j p/en ? s anken e lectric c o ., l td. 2016 parameter symbol conditions min. typ. max. unit remarks minimum drive voltage v drive(min) vc c 6 v ? ? v minimum on time t on(min) ocp = 1 v, drive = 680 pf ? 170 ? ns protection function leading edge blanking time * t bw ? 100 ? ns ocp threshold voltage v ocp 0.46 0.5 0.54 v olp delay time t olp ss = 10 nf 32 42 52 ms drive stop threshold voltage v st 3.5 4.0 4.5 v thermal s hutdown o perating t emperature * t jh (tsd) 150 165 ? c thermal s hutdown r elease t emperature * t jl (tsd) ? 150 ? c * design assurance .
SFA0002 SFA0002 - dse rev. 1.0 sanken electric co., ltd 6 nov. 17, 2 01 6 http://www.sanken - ele.co.j p/en ? s anken e lectric c o ., l td. 2016 4. performance curves figure 4 - 1 . switching frequency, f osc , vs. freq pin capacitor, c freq figure 4 - 2 . switching frequency ( freq = 200 pf ) temperature characteristics figure 4 - 3 . drv pin voltage, v drive , vs. vcc pin voltage, v cc figure 4 - 4 . feedback voltage, v fb , temperature characteristics figure 4 - 5 . vcc pin current, i cc , vs. vcc pin voltage , v cc 10 100 1000 10 100 1000 10000 fosc[khz] cfreq[pf] 85 88 91 94 97 100 103 106 109 112 115 - 50 0 50 100 150 fosc(200p)[khz] ta[ 0 1 2 3 4 5 6 7 8 9 0 5 10 15 20 25 vdrive[v] vcc[v] 2.45 2.46 2.47 2.48 2.49 2.5 2.51 2.52 2.53 2.54 2.55 - 50 0 50 100 150 vfb[v] ta[ 0 0.5 1 1.5 2 2.5 3 3.5 4 0 5 10 15 20 25 icc[ma] vcc[v] f osc (khz) c freq (pf) f osc (200 p) (khz) t a ( c ) v drive (v) v cc (v) v fb (v) t a ( c ) i cc (ma) v cc (v)
SFA0002 SFA0002 - dse rev. 1.0 sanken electric co., ltd 7 nov. 17, 2 01 6 http://www.sanken - ele.co.j p/en ? s anken e lectric c o ., l td. 2016 5. block diagram 6. pin configuration and definitions 1 5 6 7 8 4 3 2 vcc fb freq drive ocp comp gnd ss pin no. pin name function 1 vcc power supply voltage input 2 fb c onstant voltage control signal input 3 gnd g round 4 ss connecting capacitor for s oft - start time and olp delay time setting , and the drive pin stop signal input 5 freq connecting capacitor for switching frequency setting 6 comp connecting capacitor for phase compensation 7 d rive gate drive output 8 ocp overcurrent detection signal input vcc (1) fb (2) (3) gnd ss (4) freq (5) (6) comp ocp (8) (7) d rive
SFA0002 SFA0002 - dse rev. 1.0 sanken electric co., ltd 8 nov. 17, 2 01 6 http://www.sanken - ele.co.j p/en ? s anken e lectric c o ., l td. 2016 7. typical application in applications having a power supply specified such that the drain pin of external power mosfet has large transient surge voltages, a clamp snubber circuit of a capacitor - resistor - diode ( c2, r2 and d1 ) combination should be added on the primary winding p, or a damper snubber circuit of a capacitor or a resistor - capacitor ( c3 and r3 ) combination should be added between the drain pin and the s ource pin. r 2 d 1 t 1 c 10 c 2 d 2 c 1 d 3 vout (+) c 9 r 6 q 1 r 1 1 5 6 7 8 4 2 ocp drive comp freq sfa 0002 ss fb vcc 3 gnd r 11 r 4 r 5 c 4 c 3 r 3 c 8 r 10 vout ( - ) r 8 r 9 c 7 r 7 c 5 c 6 vin p s d figure 7 - 1 . typical application circuit
SFA0002 SFA0002 - dse rev. 1.0 sanken electric co., ltd 9 nov. 17, 2 01 6 http://www.sanken - ele.co.j p/en ? s anken e lectric c o ., l td. 2016 8. physical dimensions sop8 9. marking diagram 1 8 part number s f a 0 0 0 2 y m d d c ontrol n umber lot number : y is the last digit of the year of manufacture ( 0 to 9 ) m is the month of the year ( 1 to 9 , o , n , or d ) dd is the day of the month ( 01 to 31 ) s k n otes: - dimensions in millimeters - bare lead frame: pb - free ( rohs compliant) ( between the root of lead and the back side ) enlarged view of a
SFA0002 SFA0002 - dse rev. 1.0 sanken electric co., ltd 10 nov. 17, 2 01 6 http://www.sanken - ele.co.j p/en ? s anken e lectric c o ., l td. 2016 10. timing chart figure 10- 1 . normal operation when the comp pin voltage decreases to v burst or less, the ic operation becomes into burst oscillation mode . the on - time and the intermittent cycle, etc. depend on the specification of t ypical a pplication circuit. drive v burst v fb v cc(off) v ss v lss v hss v cc(on) v hf v lf v ocp output voltage increases. ic starts soft start operation normal operation drive output stops under light load condition ic stop s
SFA0002 SFA0002 - dse rev. 1.0 sanken electric co., ltd 11 nov. 17, 2 01 6 http://www.sanken - ele.co.j p/en ? s anken e lectric c o ., l td. 2016 figure 10- 2 . protection function v cc(off) v cc(on) t olp t olp 8 v st v ocp v ocp drive limited by overcurrent protection when overcurrent status is released , the overload protection is also released. overcurrent status when the drive stop signal is input to the ss pin, and then the ss pin voltage becomes v st or more, the ic stops the drive pin output signal.
SFA0002 SFA0002 - dse rev. 1.0 sanken electric co., ltd 12 nov. 17, 2 01 6 http://www.sanken - ele.co.j p/en ? s anken e lectric c o ., l td. 2016 important notes all data, illustrations, graphs , tables and any other information included in this document as to sanken? s products listed herein (the ? sanken products?) are current as of the date this document is issued . all contents in this document are subject to any chang e without notice due to improvement of the sanken products , etc. please make sure to confirm with a sanken sales representative that the contents set forth in this document reflect the latest revisions before use. the sanken products are intended for use a s components of electronic equipment or apparatus (transportation equipment and its control systems, home appliances, office equipment, telecommunication equipment, measuring equipment, etc.). prior to use of the sanken products, please put your signature, or affix your name and seal, on the specification documents of the sanken products and return them to sanken. i f considering use of the sanken products for any applications that require higher reliability (traffic signal control systems or equipment, disa ster/crime alarm systems, etc.), you must contact a sanken sales representative to discuss the suitability of such use and put your signature, or affix your name and seal, on the specification documents of the sanken products and return them to sanken, pri or to the use of the sanken products. the sanken products are not intended for use in any applications that require extremely high reliability such as: aerospace equipment; nuclear power control systems; and medical equipment or systems, whose failure or m alfunction may result in death or serious injury to people, i.e., medical devices in class iii or a higher class as defined by relevant laws of japan (collectively, the ?specific applications?). sanken assumes no lia bility or responsibility whatsoever for any and all damages and losses that may be suffered by you, users or any third party, resulting from the use of the sanken products in the specific applications or in manner not in compliance with the instructions set forth he rein. in the event of using th e sanken p roducts by either (i) combining other products or materials therewith or (ii) physically, chemically or otherwise processing or treating the same , you must duly consider all possible risks that may result from all such uses in advance and proceed therewith at your own responsibility. although sanken is making efforts to enhance the quality and reliability of its products, it is impossible to completely avoid the occurrence of any failure or defect in semiconductor products at a certain rate. you must take, at your own responsibility , preventative measures including using a sufficient safety design and confirming safety of any equipment or systems in/for which the sanken products are used, upon due consideration of a failure occurrence rate or dera ting, etc., in order not to cause any human injury or death, fire accident or social harm which may result from any failure or malfunction of the sanken products. please refer to the relevant specification documents and sanken ? s official website in relatio n to derating. no a nti - radioactive ray design ha s been adopted for the sanken p roducts. no contents in this document can be transcribed or copied without sanken?s prior written consent. the c ircuit constant , operation examples, circuit examples, pattern la yout examples, design examples , recommended exampl es , all information an d evaluation result s based thereon, etc., described in this document are presented for the sole purpose of reference of use of the sanken products and sanken assume s no responsibility whatsoever for any and all damages and losses that may be suffered by you, users or any third party, or any possible infringement of any and all property rights including intellectual property rights and any other rights of you, u sers or any third party , result ing from the foregoing . all technical information described in this document (the ?technical information?) is presen ted for the sole purpose of reference of use of the sanken products and no license, express, implied or otherwise, i s granted hereby under any intellectual property rights or any other rights of sanken. unless otherwise agreed in writing between sanken and you, sanken makes no warranty of any kind, whether express or implied, including, without limitation, any warranty (i) as to the quality or performance of the sanken products (such as implied warranty of merchantability, or implied warranty of fitness for a particular purpose or special environment), (ii) that any sanken pro duct is delivered free of claims of third par ties by way of infringement or the like, (iii) that may arise from course of performance, course of dealing or usage of trade, and (iv) as to any information contained in this document (including its accuracy, usefulness, or reliability). in the event of u sing the sanken produ cts, you must use the same after carefully examining all applicable environmental laws and regulations that regulate the inclusion or use of any particular controlled substances, including , but not limi ted to , the eu rohs directive , so as to be in strict compliance with such applicable laws and regulations . you must not use the sanken products or the technical information for the purpose of any military applications or use, including but not limited to the development of weapons of mass destruction. in the event of exporting the sanken products or the technical information, or providing them for non - residents, you must comply with all applicable export control laws and regulations in each country including the u.s. export administration regulations (ear) and the foreign exchange and foreign trade act of japan , and follow the procedures required by such applicable laws and regulations. sanken assu mes no responsibility for any troubles, which may occur during the transportation of the sanken products including the falling thereof, out of sanken?s distribution network. although sanken has prepared this document with its due care to pursue the accurac y thereof, sanken does not warrant that it is error free and sanken assumes no liability whatsoever for any and all damages and losses which may be suffered by you resulting from any possible error s or omissions in connection with the contents included her ein . please refer to the relevant specification documents in relation to particular precautions when using the sanken products, and refer to our official website in relation to general instructions and directions for us ing the sanken products. all rights a nd title in and to any specific trademark or tradename belong to sanken or such original right holder(s). dsgn - aez - 1600 2

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