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ds04-27202-6e fujitsu semiconductor data sheet copyright?1994-2006 fujitsu limited all rights reserved assp bipolar switching regulator controller mb3769a description the fujitsu mb3769a is a pulse-width-modulation controller which is applied to fixed frequency pulse modulation technique. the mb3769a contains wide band width op-a mp and high speed comparator to construct very high speed switching regulator syst em up to 700 khz. output is suitable for power mos fet drive owing to adoption of totem pole output. the mb3769a provides stand-by mode at low voltage power supp ly when it is applied in primary control system. features ? high frequency oscillator (f = 1 khz to 700 khz) on-chip wide band frequency operation amplifier (bw = 8 mhz typ) on-chip high speed comparator (td = 120 ns typ) internal reference voltage generator prov ides a stable reference supply (5 v 2%) low power dissipation (1.5 ma typ at st andby mode, 8 ma typ at operating mode) output current 100 ma ( 600 ma at peak) high speed switching operation (tr = 60 ns, tf = 30 ns, c l = 1000 pf typ) adjustable dead-time on-chip soft start and quick shut down functions internal circuitry prohibits double pulse at dynamic current limit operation under voltage lock out function (off to on: 10 v typ, on to off: 8 v typ) on-chip output shut down circuit wi th latch function at over voltage on-chip zener diode (15 v) one type of package (sop-16pin : 1 type) applications power supply module industrial equipment ac/dc converter etc.
mb3769a 2 pin assignment 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 +in (op) -in (op) fb dtc c t r t gnd v l +in (c) -in (c) v ref ovp v cc v z v h out (top view) (fpt-16p-m06) mb3769a 3 block diagram + - + - - + + + + + + - - + s r q s r q tr i a n g l e wa v e oscillator over voltage detector - + reference regulator + - power off 2.5 v 1.5 v to 3.5 v (2.5 v) 15.4 v 30 k ? 5.0 + 0.1 v 8/10 v stb over current detection comparator pwm comp. 1.85 v 1.8 v stb stb v ref v h v l v ref out error amp dtc fb -in (op) ovp c t r t v cc v z gnd fig. 1 - mb3769a block diagram 16 4 3 1 2 13 5 6 12 11 7 14 8 9 10 15 -in (c) +in (c) +in (op) mb3769a 4 absolute maximum ratings *1 : duty 5% *2 : ta = + 25 c, sop package is mounted on the epoxy board. (4 cm x 4 cm x 0.15 cm) warning: semiconductor devices can be permanently dam aged by application of stress (voltage, current, temperature, etc.) in excess of absolute maximum ratings. do not exceed these ratings. parameter symbol rating unit min max power supply voltage v cc ? 20 v output current i out ? 120 (660* 1 )ma operation amp input voltage vin (op) ? v cc + 0.3 ( 20) v power dissipation : sop p d ? 620* 2 mw storage temperature t stg -55 +125 c mb3769a 5 recommended operating conditions warning: the recommended operating conditions are require d in order to ensure the normal operation of the semiconductor device. all of the device?s electric al characteristics are warranted when the device is operated within these ranges. always use semiconductor devices within their recommended operating cond ition ranges. operation outside these ranges may adversely affect re liability and could result in device failure. no warranty is made with respect to uses, operat ing conditions, or combinations not represented on the data sheet. users considering application outside the listed conditions are advised to contact their fujitsu representatives beforehand. parameter symbol sop package unit min typ max power supply voltage v cc 12 15 18 v output current (dc) i out -100 - +100 ma output current (peak) i out peak -600 - +600 ma operation amp input voltage v inop -0.2 0 to vref vcc-3 v fb sink current i sink --0.3ma fb source current i source --2ma comparator input voltage v inc + -0.3 0 to 3 vcc v v inc - -0.3 0 to 2 2.5 v reference section output current i ref -210ma timing resistor r t 91850k ? timing capacitor c t 100 680 10 6 pf oscillator frequency f osc 1 100 700 khz zener current i z --5ma operating ambient temperature: sop ta -30 +25 +75 c mb3769a 6 electrical characteristics (continued) (v cc =15v, ta=+25 c) parameter symbol condition value unit min typ max reference section output voltage v ref i ref = 1 ma 4.9 5.0 5.1 v input regulation ? vr in 12 v v cc 18 v - 2 15 mv load regulation ? vr ld 1 ma i ref 10 ma - -1 -15 mv temp. stability ? vr temp -30 c ta +85 c - 200 750 v/ c short circuit output current i sc v ref = 0 v 15 40 - ma oscillator section oscillator frequency f osc r t = 18 k ? c t = 680 pf 90 100 110 khz voltage stability ? f oscin 12 v v cc 18 v - 0.03 - % temp. stability ? f osc / ? t-30 c ta +85 c- 2 - % dead -time control section input bias current i d - -210 a max. duty cycle dmax vd = 1.5 v 75 80 85 % duty cycle set dset vd = 0.5 v ref 45 50 55 % input threshold voltage 0% duty cycle v do --3.53.8v max. duty cycle v dm - 1.55 1.85 - v discharge voltage v dh v cc = 7 v, i dtc = -0.3 ma 4.5 - - v error amplifier section input offset voltage v io (op) v 3 = 2.5 v - 2 10 mv input offset current i io (op) v 3 = 2.5 v - 30 300 na input bias current i ir (op) v 3 = 2.5 v -1 -0.3 - a common-mode input voltage v cm (op) 12 v v cc 18 v -0.2 - v cc -3 v voltage gain av (op) 0.5 v v 3 4 v 70 90 - db band width bw av = 0 db - 8 - mhz slew rate sr r l = 10 k ? , av = 0 db - 6 - v/ s common-mode rejection rate cmr v in = 0 v to 10 v 65 80 - db ?h? level output voltage v oh i 3 = -2 ma 4.0 4.6 - v ?l? level output voltage v ol i 3 = 0.3 ma - 0.1 0.5 v mb3769a 7 (continued) * : v cc = 8v (v cc =15v, ta=+25 c) parameter symbol condition value unit min typ max current comparator input offset voltage v io (c) v in = 1 v - 515 mv input bias current i ib (c) v in = 1 v -5 -1 - a common-mode input voltage v cm (c) - 0-2.5v voltage gain a v (c) - -200- v/v response time td 50 mv over drive -120250 ns pwm comparator section 0% duty cycle v opo r t = 18 k ? c t = 680 pf -3.53.8 v max duty cycle v opm 1.55 1.85 - v output section ?h? level output voltage v h i out = -100 ma 12.5 13.5 - v ?l? level output voltage v l i out = 100 ma -1.11.3 v rise time tr c l = 1000 pf, r l = - 60 120 ns fall time tf c l = 1000 pf, r l = -3080 ns over voltage detector threshold voltage v ovp - 2.4 2.5 2.6 v input current i iovp v in = 0 v -1.0 -0.2 - a v cc reset v cc rst - 2.0 3.0 4.5 v under voltage out stop off to on v thh - 9.2 10.0 10.8 v on to off v thl - 7.2 8.0 8.8 v supply current standby * i stb r t = 18 k ? 4 pin open -1.52.0ma operating i cc r t = 18 k ? -8.012.0ma zener voltage v z i z = 1 ma -15.4- v zener current i z v 11-7 = 1 v -0.03- ma mb3769a 8 fig. 2 - mb3769a test circuit 16 15 14 13 12 11 10 9 12345678 +in (c) -in (c) v ref ovp v cc v z v h out +in (op) -in (op) fb dtc c t r t gnd v l v fb v dtc mb3769a comp in 1.0 v 15.0 v output 10 k ? 18 k ? 680 pf test input 1000 pf 90% 10% 50% tf td tr 1.05 v 1.0 v |
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