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unisonic technologies co., ltd u9751b linear integrated circuit www.unisonic.com.tw 1 of 6 copyright ? 2005 unisonic technologies co., ltd qw-r103-034,a double channels pwm controller description the utc u9751b consists of two pwm control circuits. two pwm controllers is independent each other. it is low cost in many applications. features * switch frequency: 400khz * i sink =400ma * wide work voltage * programmable dead-time control * uvlo protection * scp protection * lower static supply current application * dc/dc converters for video cameras a backlight inverter and notebook computers etc. ssop-16(150mil) dip-16 sop-16 *pb-free plating product number: u9751bl order information order number normal lead free plating package packing u9751b-d16-t u9751bl-d16-t dip-16 tube U9751B-S16-R u9751bl-s16-r sop-16 tape reel u9751b-s16-t u9751bl-s16-t sop-16 tube u9751b-r16-r u9751bl-r16-r ssop-16 tape reel u9751b-r16-t u9751bl-r16-t ssop-16 tube u9751bl-d16-r (1)packing type (2)package type (3)lead plating (1) r: tape reel, t: tube (2) d16: dip-16, s16: sop-16, r16: ssop-16 (3) l: lead free plating, blank: pb/sn
u9751b linear integrated circuit unisonic technologies co., ltd 2 of 6 www.unisonic.com.tw qw-r103-034,a pin configuration 16 15 14 13 12 11 10 9 c t fb1 ea1- ea1+ dtc1 out1 gnd scp fb2 ea2- dtc2 out2 1 2 3 4 5 6 7 8 r t v cc v ref ea2+ pin description no. name description 1 c t capacitor connected to the pi n controlling oscillator frequency 2 r t resistor connected to the pi n controlling oscillator frequency 3 ea1+ error amplifier 1 positive input 4 ea1- error amplifier 1 inverting input 5 fb1 error amplifier 1 output, used for feedback output 1 6 dtc1 dead-time comparator output 1 7 out1 output 1 8 gnd ground 9 v cc power supply 10 out2 output 2 11 dtc2 dead-time comparator output 2 12 fb2 error amplifier 2 output, used for feedback output 2 13 ea2- error amplifier 2 inverting input 14 ea2+ error amplifier 2 positive input 15 scp short circuit protection input 16 v ref internal 2.5v reference voltage
u9751b linear integrated circuit unisonic technologies co., ltd 3 of 6 www.unisonic.com.tw qw-r103-034,a block diagram 9 10 16 7 8 6 5 15 13 14 12 11 iscp r s uvlo pwm comp pwm comp oscillator 1.2v v ref reference voltage 1 2 4 3 + - + - - + + shutdown
u9751b linear integrated circuit unisonic technologies co., ltd 4 of 6 www.unisonic.com.tw qw-r103-034,a absolute maximum ratings parameter symbol ratings unit supply voltage v cc +38 v differential input voltage v i(diff) +20 v output voltage v out +38 v output current i out +450 ma maximum junction temperature t j +150 operating temperature t opr -20 ~ +85 storage temperature t stg -55 ~ +150 note: absolute maximum ratings are those values beyond which the device c ould be permanently damaged. absolute maximum ratings are stress ratings onl y and functional device operat ion is not implied. dc electronic characteristics v cc =6v, f=200khz (unless otherwise specified) parameter symbol test conditions min typ max unit reference section internal reference voltage v ref i out =1ma 2.40 2.46 2.53 v v ref regulation with v cc v ? ref v cc =3.6v ~ 40v 3.5 mv v ref regulation with i o(ref) v ? ref i out = 0.1ma to 1ma 2 mv t a =-20
~ 25
-0.1% 1% v ref regulation with temperature t a =25
~ 85
-0.2% 1% short-circuit output current i o(sc) v out =0 18 22 30 ma undervoltage lockout section threshold voltage(v cc ) v thr i o(ref) = 0.1ma,t a =25
2.5 2.8 3.2 v short-circuit protect ion control section scp input threshold voltage v i(thr) t a = 25
1.2 1.3 1.5 v scp comparator threshold voltage v com(thr) 1.26 v scp standby voltage v stn-by no pull-up 110 220 mv scp latched input voltage v i(lth) no pull-up 77 200 mv input (source) current i i(source) v in =0.7v, t a =25
-1.5 -2.0 -2.5 a oscillator section frequency f c t =220pf, r t =10k 400 kh z deviation of frequency ? f c t =220pf, r t =10k 10% frequency regulation with voltage ? f/ ? v v cc =3.6v to 40v 1% t a =-20
_ 25
-0.4% 2% frequency regulation with temperature ? f/ ? t t a =25
_ 85
-0.2% 2% dead-time control section latched input voltage v i(lth) i our dtc =40a 1.9 v zero duty cycle 1.75 1.95 2.15 input threshold voltage at f=10kh z v i(thr) maximum duty cycle 1.3 1.45 1.7 v input bias current i i(bias) 0.2 1 a latch mode (source) current i source t a =25
-620 a error-amplifier section input offset voltage v i(off) v o(fb) =1.25v 6 mv common-mode input voltage range v i(cm) v cc =3.6v to 40 v 0.3 1.6 v positive output voltage swing v o(pos) v ref -0.2 v negative output voltage swing v o(neg) 1 v input offset current i i(off) v o(fb) =1.25v 100 na
u9751b linear integrated circuit unisonic technologies co., ltd 5 of 6 www.unisonic.com.tw qw-r103-034,a dc electronic characteristics(cont.) parameter symbol test conditions min typ max unit input bias current i i(bias) v o(fb) =1.25v 160 500 na output sink current i o(sink) v i(diff) =-0.1v,v out =1.25v 1 4.0 ma output source current i o(source) v i(diff) =0.1v,v out =1.25v -45 -90 a common-mode rejection ratio cmrr 60 80 db open-loop voltage gain g vo r f =200k ? 70 80 db unity-gain bandwidth gb w 1.5 mh z output section output saturation voltage v o(sat) i out =10ma 0.7 1 v short-circuit output current i o(sc) v out =6v 450 ma off-state current i o(off) v out =50v 10 a pwm comparator section zero duty cycle 1.75 1.95 2.15 input threshold voltage at f=10khz v i(thr) maximum duty cycle 1.3 1.45 1.8 v total device standby supply current i stn-by off-state 1.7 ma average supply current i ave r t =10k 2.0 2.6 ma
u9751b linear integrated circuit unisonic technologies co., ltd 6 of 6 www.unisonic.com.tw qw-r103-034,a typical application typical application r14 q4 q3 r19 c14 r17 1k m2 9435 c13 100 uf l3 20uh d2 scd24 r23 1.21 k 1% r22 2k 1% r24 c16 220 uf/16 v vout 2 vout1 c10 220 uf/16 v q2 q1 r18 c8 r16 1k m1 9435 c17 100 uf l2 20uh d1 scd24 r21 3.3k 1% r20 10k 1 % r25 r15 1k c9 c15 r13 1k r12 r11 33 k ct ref rt scp eainv 1 eainv 2 eaout1 eaout 2 fb1 fb2 dtc1 dtc2 out1 out2 gnd vcc ic1 r10 33k c7 0.027uf r9 33 k c20 . 33uf r7 10k r6 10k c1 2 c11 r8 r5 utc u9751 b r3 33k c6 0.027uf c4 r2 33k c3 100uf r1 33k c1 330pf r4 10k vin c5 timing waveform h l 1.3v 0v scp enabel output scp waveform output waveform (h shutdown) error amplifier output ct waveform h l timing diagram utc assumes no responsibility for equipment failures that result from using products at values that exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or other parameters) listed in products specifications of any and all utc products described or contained herein. utc products are not designed for use in life support appliances, devices or systems where malfunction of these products can be reasonably expected to result in personal injury. reproduction in whole or in part is prohibited without the prior written consent of the copyright owner. the information presented in this document does not form part of any quotation or contract, is believed to be accurate and reliable and may be changed without notice.

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