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april 2010 ? 2009 fairchild semiconductor corporation www.fairchildsemi.com fsbh0f70a, fsbh0170/a, fsbh0270/a, fsbh0370 ? rev. 1.0.3 fsbh0f70a, fsbh0170/a, fsbh0270/a, fsbh0370 ? gr een mode fairchild power switch (fps?) fsbh0f70a, fsbh0170/a, fsbh0270/a, fsbh0370 green mode fairchild power switch (fps?) features ? brownout protection with hysteresis ? built-in 5ms soft-start function ? internal avalanche-rugged 700v sensefet ? no acoustic noise during light-load operation ? high-voltage startup ? linearly decreasing pwm frequency to 18khz ? peak-current-mode control ? cycle-by-cycle current limiting ? leading-edge blanking (leb) ? synchronized slope compensation ? internal open-loop protection ? v dd under-voltage lockout (uvlo) ? v dd over-voltage protection (ovp) ? internal auto-restart circuit (ovp, otp) ? constant power limit (full ac input range) ? internal otp sensor with hysteresis ? vin pin for pull-high latch function and pull- low auto-recovery protection applications general-purpose switch-mode power supplies and flyback power converters, including: ? auxiliary power supply for pc and server ? smps for vcr, svr, stb, dvd & dvcd player, printer, facsimile, and scanner ? adapter for camcorder description the highly integrated fsbh-series consists of an integrated current-mode pulse width modulator (pwm) and an avalanche-rugged 700v sensefet. it is specifically designed for high-performance offline switch mode power supplies (smps) with minimal external components. the integrated pwm controller features include a proprietary green-mode function that provides off-time modulation to linearly decrease the switching frequency at light-load conditions to minimize standby power consumption. to avoid acoustic-noise problems, the minimum pwm frequency is set above 18khz. this green-mode function enables the power supply to meet international power conservation requirements. the pwm controller is manufac tured using the bicmos process to further reduce power consumption. the fsbh-series turns off some internal circuits to improve power saving when v fb is lower than 1.6v, which allows an operating current of only 2.5ma. the fsbh-series has built-in synchronized slope compensation to achieve stable peak-current-mode control. the proprietary external line compensation ensures constant output power limit over a wide ac input voltage range, from 90v ac to 264v ac . the fsbh-series provides m any protection functions. in addition to cycle-by-cycle current limiting, the internal open-loop protection circuit ensures safety when an open-loop or output short occurs. pwm output is disabled until v dd drops below the v th-olp , then the controller starts up again. as long as v dd exceeds 28v, the internal ovp circuit is triggered. compared with a discrete mosfet and controller or rcc switching converter solution, the fsbh-series reduces total component count, design size, and weight; while increasing efficiency, productivity, and system reliability. these devices provide a basic platform that is well suited for the design of cost- effective flyback converters, such as in pc auxiliary power supplies.
? 2009 fairchild semiconductor corporation www.fairchildsemi.com fsbh0f70a, fsbh0170/a, fsbh0270/a, fsbh0370 ? rev. 1.0.3 2 fsbh0f70a, fsbh0170/a, fsbh0270/a, fsbh0370 ? gr een mode fairchild power switch (fps?) ordering information part number sense fet operating temperature range vin pin (pin #4) package packing method fsbh0f70any 0.5a 700v -40c to +105c not available 8-pin dual in-line package (dip) tube fsbh0170any 1.0a 700v -40c to +105c fsbh0270any 2.0a 700v -40c to +105c fsbh0170ny 1.0a 700v -40c to +105c enabled fsbh0270ny 2.0a 700v -40c to +105c fsbh0370ny 3.0a 700v -40c to +105c application diagram hv drain gnd vdd fb vin figure 1. typical flyback application output power table (1) product 230v ac 15% (2) 85-265v ac adapter (3) open frame (4) adapter (3) open frame (4) fsbh0f70a 7w 10w 6w 8w fsbh0170/a 10w 15w 9w 13w fsbh0270/a 14w 20w 11w 16w fsbh0370 17.5w 25w 13w 19w notes: 1. the maximum output power can be limited by junction temperature. 2. 230 v ac or 100/115 v ac with doublers. 3. typical continuous power in a non-ventilated enclosed adapt er with sufficient drain pattern as a heat sink at 50 c ambient. 4. maximum practical continuous power in an open-frame desi gn with sufficient drain pattern as a heat sink at 50 c ambient.
? 2009 fairchild semiconductor corporation www.fairchildsemi.com fsbh0f70a, fsbh0170/a, fsbh0270/a, fsbh0370 ? rev. 1.0.3 3 fsbh0f70a, fsbh0170/a, fsbh0270/a, fsbh0370 green ? mode fairchild power switch (fps?) internal block diagrams figure 2. fsbh0170, fsbh0270, fsbh0370 internal block diagram figure 3. fsbh0f70a, fsbh0170a, fsbh0270a internal block diagram
? 2009 fairchild semiconductor corporation www.fairchildsemi.com fsbh0f70a, fsbh0170/a, fsbh0270/a, fsbh0370 ? rev. 1.0.3 4 fsbh0f70a, fsbh0170/a, fsbh0270/a, fsbh0370 ? gr een mode fairchild power switch (fps?) pin configuration 8 1 zxytt bh0f70a tpm 8 1 zxytt bh0170a tpm 8 1 zxytt bh0270a tpm 8 1 zxytt bh0170 tpm 8 1 zxytt bh0270 tpm 8 1 zxytt bh0370 tpm figure 4. pin configuration and top mark information pin definitions pin # name description 1 gnd ground . sensefet source terminal on prim ary side and internal controller ground. 2 vdd power supply . the internal protection circuit disables pwm output as long as v dd exceeds the ovp trigger point. 3 fb feedback . the signal from the external compensation ci rcuit is fed into this pin. the pwm duty cycle is determined in response to the signal on this pin and the internal current-sense signal. 4 vin line-voltage detection . the line-voltage detection is used for brownout protection with hysteresis and constant output power limit over uni versal ac input range. this pin has additional protections that are pull-high latch and pull-lo w auto recovery, depending on the application. nc no connection for fsbh0f70a, fsbh0170a and fsbh0270a. 5 hv startup . for startup, this pin is pulled high to the line input or bulk capacitor via resistors. 6 drain sensefet drain . high-voltage power sensefet drain connection. 7 drain sensefet drain . high-voltage power sensefet drain connection. 8 drain sensefet drain . high-voltage power sensefet drain connection. f ? fairchild logo z ? plant code x ? 1-digit year code y ? 1-digit week code tt ? 2-digit die run code t ? package type (n:dip) p ? y: green package m ? manufacture flow code
? 2009 fairchild semiconductor corporation www.fairchildsemi.com fsbh0f70a, fsbh0170/a, fsbh0270/a, fsbh0370 ? rev. 1.0.3 5 fsbh0f70a, fsbh0170/a, fsbh0270/a, fsbh0370 ? gr een mode fairchild power switch (fps?) absolute maximum ratings stresses exceeding the absolute maximum ratings may damage the device. the device may not function or be operable above the recommended operating conditions and stressing the parts to these levels is not recommended. in addition, extended exposure to stresses above the recommended operating conditions may affect device reliability. the absolute maximum ratings are stress ratings only. symbol parameter min. max. unit v drain drain pin voltage (5,6) fsbh0x70/a 700 v i dm drain current pulsed (7) fsbh0f70a 1.5 a fsbh0170/a 4.0 fsbh0270/a 8.0 fsbh0370 12.0 e as single pulsed avalanche energy (8) fsbh0f70a 10 mj fsbh0170/a 50 fsbh0270/a 140 fsbh0370 230 v dd dc supply voltage 30 v v fb fb pin input voltage -0.3 7.0 v v in vin pin input voltage -0.3 7.0 v v hv hv pin input voltage 700 v p d power dissipation (t a 50c) 1.5 w ja junction-to-air thermal resistance 80 c/w jc junction-to-case thermal resistance 20 c/w t j operating junction temperature internally limited (9) c t stg storage temperature range -55 +150 c t l lead temperature (wave soldering or ir, 10 seconds) +260 c esd electrostatic discharge capability, all pins except hv pin human body model: jesd22-a114 3 kv charged device model: jesd22-c101 1 notes : 5. all voltage values, except differential voltages, are given with respect to the network ground terminal. 6. stresses beyond those listed under absolute maximu m ratings may cause permanent damage to the device. 7. non-repetitive rating: pulse width is limited by maximum junction temperature. 8. l = 51mh, starting t j = 25 c. 9. internally limited of t j refers to t otp recommended operating conditions the recommended operating conditions table defines the conditions for actual device operation. recommended operating conditions are specified to ens ure optimal performance to the datasheet specifications. fairchild does not recommend exceeding them or designing to absolute maximum ratings. symbol parameter conditions min. typ. max. unit t a operating ambient temperature -40 +105 c
? 2009 fairchild semiconductor corporation www.fairchildsemi.com fsbh0f70a, fsbh0170/a, fsbh0270/a, fsbh0370 ? rev. 1.0.3 6 fsbh0f70a, fsbh0170/a, fsbh0270/a, fsbh0370 ? gr een mode fairchild power switch (fps?) electrical characteristics v dd =15v and t a =25 c unless otherwise specified. symbol parameter condition min. typ. max. unit sensefet section (10) bv dss drain-source breakdown voltage fsbh0x70/a v ds = 700v, v gs = 0v 700 v i dss zero-gate-voltage drain current fsbh0x70/a v ds = 700v, v gs = 0v 50 a v ds = 560v, v gs = 0v, t c = 125 c 200 r ds(on) drain-source on- state resistance (11) fsbh0f70a v gs = 10v, i d = 0.5a 14.00 19.00 ? fsbh0170/a 8.80 11.00 fsbh0270/a 6.00 7.20 fsbh0370 4.00 4.75 c iss input capacitance fsbh0f70a v gs = 0v, v ds = 25v, f = 1mhz 162 211 pf fsbh0170/a 250 325 fsbh0270/a 550 715 fsbh0370 315 410 c oss output capacitance fsbh0f70a v gs = 0v, v ds = 25v, f = 1mhz 18 24 pf fsbh0170/a 25 33 fsbh0270/a 38 50 fsbh0370 47 61 c rss reverse transfer capacitance fsbh0f70a v gs = 0v, v ds = 25v, f = 1mhz 3.8 5.7 pf fsbh0170/a 10.0 15.0 fsbh0270/a 17.0 26.0 fsbh0370 9.0 24.0 t d(on) turn-on delay time fsbh0f70a v ds = 350v, i d = 1.0a 9.5 29.0 ns fsbh0170/a 12.0 34.0 fsbh0270/a 20.0 50.0 fsbh0370 11.2 33.0 t r rise time fsbh0f70a v ds = 350v, i d = 1.0a 19 48 ns fsbh0170/a 4 18 fsbh0270/a 15 40 fsbh0370 34 78 t d(off) turn-off delay time fsbh0f70a v ds = 350v, i d = 1.0a 33.0 76.0 ns fsbh0170/a 30.0 70.0 fsbh0270/a 55.0 120.0 fsbh0370 28.2 67.0 t f fall time fsbh0f70a v ds = 350v, i d = 1.0a 42 94 ns fsbh0170/a 10 30 fsbh0270/a 25 60 fsbh0370 32 74 continued on the following page?
? 2009 fairchild semiconductor corporation www.fairchildsemi.com fsbh0f70a, fsbh0170/a, fsbh0270/a, fsbh0370 ? rev. 1.0.3 7 fsbh0f70a, fsbh0170/a, fsbh0270/a, fsbh0370 ? gr een mode fairchild power switch (fps?) electrical characteristics (continued) v dd =15v and t a =25 c unless otherwise specified. symbol parameter condition min. typ. max. unit control section v dd section v dd-on start threshold voltage 11 12 13 v v dd-off minimum operating voltage 7 8 9 v i dd-st startup current fsbh0170 fsbh0270 fsbh0370 v dd-on ? 0.16v 30 a fsbh0f70a fsbh0170a fsbh0270a v dd-on ? 0.16v 240 320 400 i dd-op operating supply current v dd = 15v, v fb = 3v 3.0 3.5 4.0 ma i dd-zdc operating current for v fb ? 2009 fairchild semiconductor corporation www.fairchildsemi.com fsbh0f70a, fsbh0170/a, fsbh0270/a, fsbh0370 ? rev. 1.0.3 8 fsbh0f70a, fsbh0170/a, fsbh0270/a, fsbh0370 ? gr een mode fairchild power switch (fps?) electrical characteristics (continued) v dd =15v and t a =25 c unless otherwise specified. symbol parameter condition min. typ. max. unit v fb-open output high voltage fb pin open 5.5 v v fb-n green-mode entry fb voltage 2.3 2.5 2.7 v v fb-g green-mode ending fb voltage 1.9 2.0 2.1 v v fb-zdc zero duty cycle fb voltage 1.6 v v fb-olp fb open-loop trigger level fsbh0f70a 5.2 5.4 5.6 v fsbh0x70/a 4.4 4.6 4.8 v t d-olp fb open-loop protection delay 50 56 59 ms current-sense section (14) i lim peak current limit fsbh0f70a v in open 0.63 0.73 0.83 a fsbh0170/a v in = 1.2v / v in open 0.70 0.80 0.90 fsbh0270/a v in = 1.2v / v in open 0.90 1.00 1.10 fsbh0370 v in = 1.2v 1.10 1.20 1.30 t ss period during soft-start time (10) 4.5 5.0 5.5 ms constant power limit (fsbh0170, fsbh0270, fsbh0370) v lmt1 threshold voltage 1 for current limit v in = 1.2v 0.73 0.80 0.87 v v lmt2 threshold voltage 2 for current limit v in = 3.6v 0.56 0.63 0.70 v current limit (fsbh0f70a, fsbh0170a, fsbh0270a) v lmt threshold voltage for current limit fsbh0f70a 0.97 1.00 1.03 v fsbh0170a/0270a 0.77 0.80 0.83 v over-temperature protection section (otp) t otp protection junction temperature (10, 12) +135 +142 +150 c t restart restart junction temperature (10, 13) t otp -25 c notes: 10. these parameters, although guaranteed, are not 100% tested in production. 11. pulse test: pulse width 300s, duty 2%. 12. when activated, the output is disabled and the latch is turned off. 13. the threshold temperature for enabling the output again and resetting the latch after over-temperature protection has been activated. 14. these parameters, although guaranteed, are tested in wafer process. figure 5. v fb vs. pwm frequency pwm frequency f osc f osc-g v fb-n v fb-g v fb-zdc v fb
? 2009 fairchild semiconductor corporation www.fairchildsemi.com fsbh0f70a, fsbh0170/a, fsbh0270/a, fsbh0370 ? rev. 1.0.3 9 fsbh0f70a, fsbh0170/a, fsbh0270/a, fsbh0370 green ? mode fairchild power switch (fps?) typical characteristics (continued) 0 2 4 6 8 10 12 14 -40 -25 -10 5 20 35 50 65 80 95 110 125 temperature(c) i dd-st (a) 2.86 2.88 2.90 2.92 2.94 2.96 2.98 3.00 3.02 -40 -25 -10 5 20 35 50 65 80 95 110 125 temperature(c) i dd-op (a) figure 6. i dd-st vs. temperature figure 7. i dd-op vs. temperature 11.2 11.4 11.6 11.8 12.0 12.2 12.4 -40 -25 -10 5 20 35 50 65 80 95 110 125 temperature(c) v dd-on (v) 7.7 7.8 7.9 8.0 8.1 8.2 8.3 -40 -25 -10 5 20 35 50 65 80 95 110 125 temperature(c) v dd-off (v) figure 8. v dd-on vs. temperature figure 9. v dd-off vs. temperature 5.0 5.2 5.4 5.6 5.8 6.0 6.2 6.4 6.6 -40 -25 -10 5 20 35 50 65 80 95 110 125 temperature(c) v th-olp (v) 28.35 28.36 28.37 28.38 28.39 28.40 28.41 28.42 -40 -25 -10 5 20 35 50 65 80 95 110 125 temperature(c) v dd-ovp (v) figure 10. v th-olp vs. temperature figure 11. v dd-ovp vs. temperature 1.0 1.5 2.0 2.5 3.0 3.5 4.0 -40 -25 -10 5 20 35 50 65 80 95 110 125 temperature(c) i hv (ma) 0 1 2 3 4 5 6 7 -40 -25 -10 5 20 35 50 65 80 95 110 125 temperature(c) i hv-lc (a) figure 12. i hv vs. temperature figure 13. i hv-lc vs. temperature
? 2009 fairchild semiconductor corporation www.fairchildsemi.com fsbh0f70a, fsbh0170/a, fsbh0270/a, fsbh0370 ? rev. 1.0.3 10 fsbh0f70a, fsbh0170/a, fsbh0270/a, fsbh0370 ? gr een mode fairchild power switch (fps?) typical characteristics (continued) 97.5 98.0 98.5 99.0 99.5 100.0 100.5 101.0 101.5 -40 -25 -10 5 20 35 50 65 80 95 110 125 temperature(c) f osc (khz) 18.6 18.7 18.8 18.9 19.0 19.1 19.2 -40 -25 -10 5 20 35 50 65 80 95 110 125 temperature(c) f osc-g (khz) figure 14. f osc vs. temperature figure 15. f osc-g vs. temperature 0.58 0.59 0.60 0.61 0.62 0.63 0.64 -40 -25 -10 5 20 35 50 65 80 95 110 125 temperature(c) v in-off (v) 1.11 1.12 1.13 1.14 1.15 1.16 1.17 -40 -25 -10 5 20 35 50 65 80 95 110 125 temperature(c) v in-on (v) figure 16. v in-off vs. temperature figure 17. v in-on vs. temperature 4.57 4.58 4.59 4.60 4.61 4.62 4.63 -40 -25 -10 5 20 35 50 65 80 95 110 125 temperature(c) v in-h (v) 0.28 0.29 0.30 0.31 0.32 0.33 0.34 -40 -25 -10 5 20 35 50 65 80 95 110 125 temperature(c) v in-l (v) figure 18. v in-h vs. temperature figure 19. v in-l vs. temperature 4.35 4.40 4.45 4.50 4.55 4.60 4.65 4.70 4.75 -40 -25 -10 5 20 35 50 65 80 95 110 125 temperature(c) v fb-olp (v) 2.30 2.35 2.40 2.45 2.50 2.55 2.60 -40 -25 -10 5 20 35 50 65 80 95 110 125 temperature(c) v fb-n (v) figure 20. v fb-olp vs. temperature figure 21. v fb-n vs. temperature
? 2009 fairchild semiconductor corporation www.fairchildsemi.com fsbh0f70a, fsbh0170/a, fsbh0270/a, fsbh0370 ? rev. 1.0.3 11 fsbh0f70a, fsbh0170/a, fsbh0270/a, fsbh0370 ? gr een mode fairchild power switch (fps?) typical characteristics (continued) 1.80 1.85 1.90 1.95 2.00 2.05 2.10 2.15 2.20 -40 -25 -10 5 20 35 50 65 80 95 110 125 temperature(c) v fb-g (v) 1.200 1.300 1.400 1.500 1.600 1.700 1.800 -40 -25 -10 5 20 35 50 65 80 95 110 125 temperature(c) v fb-zdc (v) figure 22. v fb-g vs. temperature figure 23. v fb-zdc vs. temperature 2.42 2.44 2.46 2.48 2.50 2.52 2.54 2.56 -40 -25 -10 5 20 35 50 65 80 95 110 125 temperature(c) i dd-zdc (ma) 51.5 52.0 52.5 53.0 53.5 54.0 54.5 55.0 -40 -25 -10 5 20 35 50 65 80 95 110 125 temperature(c) t d-olp (ms) figure 24. i dd-zdc vs. temperature figure 25. t d-olp vs. temperature
? 2009 fairchild semiconductor corporation www.fairchildsemi.com fsbh0f70a, fsbh0170/a, fsbh0270/a, fsbh0370 ? rev. 1.0.3 12 fsbh0f70a, fsbh0170/a, fsbh0270/a, fsbh0370 ? gr een mode fairchild power switch (fps?) functional description startup operation the hv pin is connected to bulk voltage through an external resistor, r hv , as shown in figure 26. when ac voltage is applied to power system, an internal hv startup circuit provides a hi gh current (around 3.5ma) to charge an external v dd capacitor until v dd voltage exceeds the turn-on threshold voltage (v dd-on ). for better power consumption, the hv startup circuit shuts down during normal operation. the external v dd capacitor and auxiliary winding maintain the v dd voltage and provide operating current to controller. figure 26. startup circuit slope compensation the fsbh-series is designed for flyback power converters. the peak-current -mode control is used to optimize system performance. slope compensation is added to reduce current loop gain and improve power system stability. the fsbh-series has a built-in, synchronized, positive slope for each switching cycle. soft-start the fsbh-series has an internal soft-start circuit that reduces the sensefet swit ching current during power system startup. the characte ristic curve of soft-start time versus v lmt level is shown in figure 27. the v lmt level slopes up like a six-step staircase. in doing so, power system can smoothly build up the rated output voltage and effectively reduce voltage stress on the pwm switch and output diode. figure 27. soft-start function brown-in/out function fsbh0x70 has a built-in internal brown-in/out protection comparator monitoring voltage of vin pin. figure 28 shows a resistive divider with low-pass filtering for line- voltage detection on the vin pin. figure 28. brown-in/out function on vin pin once the vin pin voltage is lower than 0.6v and lasts for 500ms, the pwm gate is disabled to protect the system from over current. fsbh0x70 starts up as v in increases above 1.1v. because the divider resistors of the vin pin are connected behind the bridge, the ratio calculation for brownout in pfc and non-pfc system are different, as shown in figure 29. the formulas are provided in the following equations : brownout with pfc: _ 2 20.6 c ac out abc r v rrr ??= ++ (1) brownout with non-pfc: _ 20.6 c ac out abc r v rrr ?= ++ (2) brown-in level is determined by: _ 1.1 2 a bc ac in c rrr v r ++ =? (3) figure 29. v in level according to pfc operation
? 2009 fairchild semiconductor corporation www.fairchildsemi.com fsbh0f70a, fsbh0170/a, fsbh0270/a, fsbh0370 ? rev. 1.0.3 13 fsbh0f70a, fsbh0170/a, fsbh0270/a, fsbh0370 ? gr een mode fairchild power switch (fps?) brown-in function of fsbh0x70a the vin pin functions are disabled from fsbh0x70a, but fsbh0x70a has brown-in protection in the vdd pin. there is a discharge current internal from v dd to ground during startup. the hv sour ce current must be larger than i dd-st to charge the capacitor of v dd . therefore, the brown-in level can be determined by r hv according to the equation: 212 ac hv dd st v r i ? ? = (4) green-mode operation the fsbh-series uses feedback voltage (v fb ) as an indicator of the output load and modulates the pwm frequency, as shown in figure 30, such that the switching frequency decreases as load decreases. in heavy load conditions, the switching frequency is 100khz. once v fb decreases below v fb-n (2.5v), the pwm frequency starts to linearly decrease from 100khz to 18khz for reducing switching losses. as v fb decreases below v fb-g (2.0v), the switching frequency is fixed at 18khz and fsbh-series enters ?deep? green mode to reduce the standby power consumption. figure 30. pwm frequency as v fb decreases below v fb-zdc (1.6v), fsbh-series enters into burst-mode operation. when v fb drops below v fb-zdc , fsbh-series stops switching and the output voltage starts to drop, which causes the feedback voltage to rise. once v fb rises above v fb-zdc , switching resumes. burst mode alternately enables and disables switching, thereby reducing switching loss to improve power saving, as shown in figure 31. v fb (1.6v) i drain v o switching disabled v fb.zdc switching disabled figure 31. burst-mode operation h/l line over-power compensation to limit the output power of the converter constantly, high/low line over-power compensation is included. sensing the converter input voltage through the vin pin, the high/low line compensat ion function generates a relative peak-current-limit threshold voltage for constant power control, as shown in figure 32. figure 32. constant power control protections the fsbh-series provides full protection functions to prevent the power supply and the load from being damaged. the protection features include: latch/auto-recovery function besides the brownout protection and high/low line over- power compensation, the fsbh0170/0270/0370 has additional protections via the vin pin, such as pull- high latch and pull-low auto-recovery that depends on the application. as shown in figure 33, v in level is higher than 4.7v, fsbh-series is latched until the v dd is discharged. fsbh-series is auto-recovery when the v in level is lower than 0.3v. figure 33. vin pin function open-loop / overload protection (olp) when the upper branch of the voltage divider for the shunt regulator (ka431 shown) is broken, as shown in figure 34, or over current or output short occurs, there is no current flowing through the opto-coupler transistor, which pulls the feedback voltage up to 6v. when feedback voltage is above 4.6v for longer than 56ms, olp is triggered. this protection is also triggered when the smps output drops below the nominal value longer than 56ms due to the overload condition.
? 2009 fairchild semiconductor corporation www.fairchildsemi.com fsbh0f70a, fsbh0170/a, fsbh0270/a, fsbh0370 ? rev. 1.0.3 14 fsbh0f70a, fsbh0170/a, fsbh0270/a, fsbh0370 ? gr een mode fairchild power switch (fps?) 6v 4.6v r 3r v fb ka431 vo pwm olp 56ms feedback open loop figure 34. olp operation v dd over-voltage protection (ovp) v dd over-voltage protection prevents ic damage caused by over voltage on the vdd pin. the ovp is triggered when v dd voltage reaches 28v. debounce time (typically 130s) prevents false tri gger by switching noise. over-temperature protection (otp) the sensefet and the control ic are integrated, making it easier to detect the temperature of the sensefet. when the temperature exceeds approximately 142 c, thermal shutdown is activated.
? 2009 fairchild semiconductor corporation www.fairchildsemi.com fsbh0f70a, fsbh0170/a, fsbh0270/a, fsbh0370 ? rev. 1.0.3 15 fsbh0f70a, fsbh0170/a, fsbh0270/a, fsbh0370 green ? mode fairchild power switch (fps?) physical dimensions 5.08 max 0.33 min 2.54 7.62 0.56 0.355 1.65 1.27 3.683 3.20 3.60 3.00 6.67 6.096 9.83 9.00 7.62 9.957 7.87 0.356 0.20 notes: unless otherwise specified a) this package conforms to jedec ms-001 variation ba b) all dimensions are in millimeters. c) dimensions are exclusive of burrs, mold flash, and tie bar extrusions. d) dimensions and toleranc es per asme y14.5m-1994 8.255 7.61 e) drawing filename and revsion: mkt-n08frev2. (0.56) figure 35. 8-pin dual in-line package (dip) package drawings are provided as a service to customers considering fairchild components. drawings may change in any manner without notice. please note the revision and/or date on the drawing and contact a fairchild semiconductor representative to ver ify or obtain the most recent revision. package specifications do not expand the terms of fairchild?s worldwide terms and condition s, specifically the warranty therein, which covers fairchild products. always visit fairchild semiconductor?s online packaging area for the most recent package drawings: http://www.fairchildsemi.com/packaging/ .
? 2009 fairchild semiconductor corporation www.fairchildsemi.com fsbh0f70a, fsbh0170/a, fsbh0270/a, fsbh0370 ? rev. 1.0.3 16 fsbh0f70a, fsbh0170/a, fsbh0270/a, fsbh0370 ? gr een mode fairchild power switch (fps?)

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