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unisonic technologies co., ltd tl1451 linear integrated circuit www.unisonic.com.tw 1 of 14 copyright ? 2008 unisonic technologies co., ltd qw-r103-011.d dual pulse-width-modulation control circuits ? description the utc tl1451 incorporates on a single monolithic chip all the functions required in the construction of two pulse-width-modulation (pwm) control circuits. designed primarily for power supply control, the utc tl1451 contains an on-chip 2.5v regulator, two error amplifie rs, an adjustable oscillator, two dead-time comparators, undervoltage lockout circuitry, and dual common ?emitter output transistor circuits. ? features *complete pwm power control circuitry *completely synchronized operation *internal undervoltag e lockout protection *wide supply voltage range *internal short-circuit protection *oscillator frequency 500khz max *variable dead time provides control over total range *internal regulator provides a stable 2.5v reference supply dip-16 sop-16 tssop-16 lead-free: tl1451l halogen-free: tl1451g ? ordering information ordering number normal lead free halogen free package packing tl1451-s16-r tl1451l-s16-r TL1451G-S16-R sop-16 tape reel tl1451-s16-t tl1451l-s16-t tl1451g-s16-t sop-16 tube tl1451-p16-r tl1451l-p16-r tl1451g-p16-r tssop-16 tape reel tl1451-p16-t tl1451l-p16-t t l1451g-p16-t tssop-16 tube tl1451-d16-t tl1451l-d16-t tl1451g-d16-t dip-16 tube
tl1451 linear integrated circuit unisonic technologies co., ltd 2 of 14 www.unisonic.com.tw qw-r103-011.d ? pin configuration ct rt 1 in+ 1 in- 1 feedback 1 dtc 1 out gnd vcc 2 out 2 dtc 2 in- scp ref 2 in+ 2 feedback error amplifier 1 error amplifier 2 1 2 3 4 5 6 7 89 10 11 12 13 14 15 16 ? block diagram
tl1451 linear integrated circuit unisonic technologies co., ltd 3 of 14 www.unisonic.com.tw qw-r103-011.d ? absolute maximum ratings (t a =25 c, unless otherwise specified) parameter symbol value unit supply voltage v cc 51 v amplifier input voltage v in 20 v collector output voltage v out 51 v collector output current i out 21 ma dip-16 1000 sop-16 500 power dissipation tssop-16 p d 700 mw junction temperature t j +125 c operating temperature t opr -20 ~ +85 c storage temperature t stg -40 ~ +150 c note: absolute maximum ratings are those values beyond which the device could be permanently damaged. absolute maximum ratings are stress ratings only an d functional device operat ion is not implied. ? recommended operating conditions parameter symbol min typ max unit supply voltage v cc 3.6 50 v amplifier input voltage v in 1.05 1.45 v collector output voltage v out 50 v collector output current(each transistor) i out 20 ma current into feedback terminal i fb 45 a feedback resistor r f 100 k timing capacitor c t 150 15000 pf timing resistor r t 8 100 k oscillator frequency f osc 1 350 khz operating temperature t opr -20 85 c ? electrical characteristics (v cc =6v, f=200khz, t a =25 c, unless otherwise specified.) parameter symbol test conditions min typ max unit reference section output voltage v out i out =1ma 2.4 2.5 2.6 v t a = -20 c ~ 25 c -0.1 1 output voltage change with temperature t a = 25 c ~ 85 c -0.2 1 % input voltage regulation v in vcc=3.6v ~ 40v 2 12.5 mv output voltage regulation v out i out =0.1ma ~ 1ma 1 7.5 mv short-circuit output current i out v out =0 3 10 30 ma undervoltage lockout section upper 2.72 v threshold voltage (vcc) lower v thr 2.6 v hysteresis (vcc) v hys 80 120 mv reset threshold voltage (vcc) i out(ref) =0.1ma 1.5 1.9 v short-circuit protection control section input threshold voltage(scp) v in(thr) 0.65 0.7 0.75 v standby voltage(scp) v stn-by no pullup 140 185 230 mv latched input voltage (scp) v in(lat) no pullup 60 120 mv input (source) current i in(source) v in =0.7v -10 -15 -20 a comparator threshold voltage (feedback) v thr 1.18 v
tl1451 linear integrated circuit unisonic technologies co., ltd 4 of 14 www.unisonic.com.tw qw-r103-011.d ? electrical characteristics(cont.) parameter symbol test conditions min typ max unit oscillator section frequency f c t =330pf, r t =10k 200 khz standard deviation of frequency c t =330pf, r t =10k 10% frequency change with voltage vcc=3.6v ~ 40v 1% t a =-20 c ~ 25 c -0.4 2 frequency change with temperature t a =25 c ~ 85 c -0.2 2 % dead-time control section input bias current (dtc) i in(bias) 1 a latch mode (source) current (dtc) -80 -145 a latched input voltage (dtc) v in i out =40 a 2.3 v zero duty cycle 2.05 2.25 input threshold voltage at f=10khz (dtc) v in(thr) maximum duty cycle 1.2 1.45 v error-amplifier section input offset voltage v in(off) v out (feedback)=1.25v 6 mv input offset current i in(off) v out (feedback)=1.25v 100 na input bias current i in(bias) v out (feedback)=1.25v 160 500 na common-mode input voltage range v in(cm) vcc=3.6v ~ 40v 1. 05~ 1.45 v open-loop voltage amplification r f =200k 70 80 db unity-gain bandwidth b g 1.5 mhz common-mode rejection ratio rr 60 80 db positive output voltage swing v out vref-0.1 v negative output voltage swing v out 1 v output (sink) current (feedback) i out(sin) v id =-0.1v, v out =1.25v 0.5 1.6 ma output (source) current (feedback) i out(sou) v id =0.1v, v out =1.25v -45 -70 a output section collector off-state current i off v out =50v 10 a output saturation voltage v out(sat) i out =10ma 1.2 2 v short-circuit output current i out(sht) v out =6v 90 ma pwm comparator section zero duty cycle 2.05 2.25 input threshold voltage at f=10khz (feedback) v i(thr) maximum duty cycle 1.2 1.45 v total device standby supply current i stn-by off-state 1.3 1.8 ma average supply current r t =10k 1.7 2.4 ma
tl1451 linear integrated circuit unisonic technologies co., ltd 5 of 14 www.unisonic.com.tw qw-r103-011.d ? test circuit out1 out2 r l 4.7k r l 4.7k 16 15 14 13 12 11 10 9 utc tl1451 12345678 v cc = 5v test input test input r t 10k c t 330pf c pe 0.47 f s1 ? timing diagram dead time 100% 2.0v 1.6v 1.4v 1.25v h l h l 0.6v 0v h l tpe * 3.6v 0v 2.8v typ * protection enable time, t pe = (0.051 10 6 c pe ) in seconds power supply voltage short-circuit protection comparator output protection enable terminal waveform output transistor collector waveform oscillator triangle waveform error amplifier output dead-time input voltage short-circuit protection comparator input voltage pwm comparator output voltage
tl1451 linear integrated circuit unisonic technologies co., ltd 6 of 14 www.unisonic.com.tw qw-r103-011.d ? application information high-speed dual sw itching regulator 16 15 14 13 12 11 10 9 utc tl1451 12345678 50k 0.47 f 220k 33k 33k r1 r2 c1 500pf vref 33k 33k 330pf 470 150 l1 v cc r3 r4 c2 step-up output 470 1 f l2 r6 r7 c4 step-down output 220 470 470 c5 r5 500pf 33k 33k note a: values for r1 through r7, c1 through c4, and l1 and l2 depend upon individual application.
tl1451 linear integrated circuit unisonic technologies co., ltd 7 of 14 www.unisonic.com.tw qw-r103-011.d ? typical characteristics 0 0 150 200 50 12 100 protection enable time vs protection enable capacitance protection enable capacitance, c pe ( f) 9 18 250 3 protection enable time, t pe (s) 15 6 170k 12k r u.v.l.o. + error amp 1 error amp 2 short-circuit protection comparator 15 - s protection latch 1.25v c pe scp v ref v ref v ref 16 0 10k 100k 1k 50 100 closed-loop gain and phase shift vs frequency frequency, f (hz) 30 70 1m 10 closed-loop gain (db) 60 20 v cc = 5v r ref = 150 c ref = 470pf ta = 25 closed-loop gain (left scale) phase shift (right scale) c x : 47pf 470pf 4700pf 40 phase shift -90 -80 -70 -60 -50 -40 -30 -20 -10 0 + - v ref 39k 39k c ref r ref c x
tl1451 linear integrated circuit unisonic technologies co., ltd 8 of 14 www.unisonic.com.tw qw-r103-011.d ? typical characteristics(cont.) 0 10k 100k 1k 50 100 closed-loop gain and phase shift vs frequency frequency, f (hz) 30 70 1m 10 closed-loop gain (db) 60 20 v cc = 5v r ref = 15 c ref = 470pf ta = 25 closed-loop gain (left scale) phase shift (right scale) c x : 47pf 470pf 4700pf 40 phase shift -90 -80 -70 -60 -50 -40 -30 -20 -10 0 + - v ref 39k 39k c ref r ref c x 0 10k 100k 1k 50 100 closed-loop gain and phase shift vs frequency frequency, f (hz) 30 70 1m 10 closed-loop gain (db) 60 20 v cc = 5v r ref = 15 c ref = 470pf ta = 25 closed-loop gain (left scale) phase shift (right scale) c x : 47pf 470pf 4700pf 40 phase shift -90 -80 -70 -60 -50 -40 -30 -20 -10 0 + - v ref 39k 39k c ref r ref c x
tl1451 linear integrated circuit unisonic technologies co., ltd 9 of 14 www.unisonic.com.tw qw-r103-011.d ? typical characteristics(cont.) 0 10k 100k 1k 50 100 closed-loop gain and phase shift vs frequency frequency, f (hz) 30 70 1m 10 closed-loop gain (db) 60 20 v cc = 5v c ref = 470pf ta= 25 closed-loop gain (left scale) phase shift (right scale) 40 phase shift -90 -80 -70 -60 -50 -40 -30 -20 -10 0 + - v ref 39k 39k c ref
tl1451 linear integrated circuit unisonic technologies co., ltd 10 of 14 www.unisonic.com.tw qw-r103-011.d ? typical characteristics(cont.) 0 010 15 5 80 output sink current vs collector output saturation voltage collector o utput saturation voltage (v) 60 120 20 20 output sink current (ma) 100 40 ta = -20 ta = 25 ta = 85 v cc = 3.6v 10 30 50 70 90 110 v o ( ref ) -0.07 -25 50 75 0 v o ( ref ) -0.03 maximum output voltage swing vs free-air temperature free-air temperature, ta ( ) v o ( ref ) -0.04 v o ( ref ) -0.01 100 v o ( ref ) -0.06 maximum output voltage swing, v om (v) v o ( ref ) -0.02 v o ( ref ) -0.05 maximum output voltage swing (right scale) maximum output voltage swing (right scale) 25 0.8 0.7 1 0.5 0.9 0.6 maximum output voltage swing, v om (v) + - v ref 33k 33k r l 100k vvom - 1 v cc = 3.6v r l = 100k v om+1 = 1.25v v om-1 = 1.15v (right scale) v om-1 = 1.35v (left scale)
tl1451 linear integrated circuit unisonic technologies co., ltd 11 of 14 www.unisonic.com.tw qw-r103-011.d ? typical characteristics triangle oscillator frequency, t osc (hz) 1m 1k 40k 400k 4k 10k triangle oscillator frequency vs timing resistance timing resistance, r t ( ) oscillator frequency variation, f osc (%) 3 -2 -25 50 75 0 1 25 oscillator frequency variation vs free-air temperature free - air temperature, ta ( ) 0 -3 2 100k 10k 1k v cc = 3.6v r t = 10k c t = 330pf f osc = 200khz 100 c t = 150pf v cc = 5v ta = 25 100k 1m c t = 1500pf c t = 15000pf -1 triangle waveform swing voltage (v) 2.6 10 1 10 3 10 2 triangle waveform awing voltage vs timing capacitance timing capacitance, c t (pf) triangle waveform period ( s) 10 2 10 1 triangle waveform period vs timing capacitance 10 -1 2 1.4 0.8 10 4 10 5 10 0 v cc = 5v r t = 5.1k ta = 25 1.2 1 2.4 2.2 1.8 1.6 10 1 10 3 10 2 10 4 10 5 v cc = 5v r t = 5.1k ta = 25 timing capacitance, c t (pf) 30 -20 -25 50 75 0 10 25 reference output voltage variation vs free-air temperature free - air temperature, t a ( ) 0 -30 20 100 -10 reference output voltage variation, v o( ref ) (mv) 30 -20 -25 50 75 0 10 25 reference output voltage variation vs free-air temperature free - air temperature, t a ( ) 0 -30 20 v cc = 3.6v i i( ref ) = 1ma 100 -10 v cc = 40v i i( ref ) = 1ma reference output voltage variation, v o( ref ) (mv)
tl1451 linear integrated circuit unisonic technologies co., ltd 12 of 14 www.unisonic.com.tw qw-r103-011.d ? typical characteristics(cont.) 1.1 0.6 -25 50 75 0 0.9 25 dropout voltage variation vs free-air temperature free - air temperature, ta ( ) 0.8 1 100 0.7 reference output voltage, v o( ref ) (v) 3 0.5 025 30 5 2 15 reference output voltage vs supply voltage supply voltage, v cc (v) 1.5 0 2.5 40 1 i i( ref ) = 1ma dropout voltage variation (v) ta = 25 35 20 10 3.5 2 -25 50 75 0 3 25 undervoltage lockout characteristics free - air temperature, ta ( ) 2.5 3.25 100 2.25 output collector voltage, v ce (v) 6 1 03 4 1 4 2 undervoltage lockout hysteresis characteristics supply voltage, v cc (v) 3 0 5 5 2 i i( ref ) = 1ma undervoltage lockout threshold voltage (v) ta = 85 ta = 20 t a = 25 7,12 8 5v r l i = i o v de i o =10ma 2.75 undervoltage lockout hystersis voltage (mv) 300 0 200 100 250 50 150 threshold voltage-v th (left scale) threshold voltage-v tl (left scale) threshold voltage (right scale) 1.10 -25 50 75 0 1.25 25 short-circuit protection characteristics free - air temperature, ta ( ) 1.20 1.30 100 1.15 compretor threshold voltage (v) rs-latch reset supply voltage (v) 1 2.5 2 3 1.5 short-circuit protection latch reset supply voltage (right scale) short-circuit protection comparator threshold voltage (left scale) g-gain (db) 10 0 gain (amplfier in unity-gain configuration) vs frequency -20 -10 1k 100k 10k 1m 10m -15 -5 5 frequency, f (hz) v cc = 5v ta = 25
tl1451 linear integrated circuit unisonic technologies co., ltd 13 of 14 www.unisonic.com.tw qw-r103-011.d ? typical characteristics(cont.) error amp maxmum output voltage swing (v) 2.25 1k 100k 10k error amp maximum output voltage swing vs frequency frequency, f (hz) open-loop voltage amplification (db) 90 60 open-loop voltage amplification vs frequency 0 1.5 1.75 0 1m 10m 30 v cc = 5v ta = 25 0.5 0.25 2 1.75 1.25 1 100 10k 1k 100k 2m 1m 10 20 40 50 70 80 frequency, f (hz) v cc = 5v ta = 25 0 020 30 10 1.5 standby current vs supply voltage supply voltage, v cc (v) 40 standby current, i cc (ma) 0.75 ta = 25 0.25 0.5 1 1.25 1.75 2 100 02 3 1 30 output transistor on duty cycle vs dead-time input voltage dead-time input voltage (v) 50 0 4 80 output transistor on duty cycle ( % ) 70 90 60 40 20 10 1.5 2.5 0.5 3.5 v cc = 3.6v r t = 10k c t = 330pf 0 -25 25 75 0 800 maximum continuous power disspation vs free-air temperature 100 maximum continuous power dissipation (mw) 400 100 300 500 700 1000 1100 0 -25 0 1.5 standby current vs free-air temperature 100 0.5 supply current, i cc (ma) 0.75 0.25 1 1.25 1.75 2 25 50 75 average supply current v cc = 6v, r t = 10k c t = 330pf stand-by current, v cc = 3.6v, no load s t a n d - b y c u r r e n t , v c c = 4 0 v , n o l o a d free-air temperature, ta ( ) thermal resistance 125 /w dip-16 sop-16 thermal resistance 250 /w 50 free-air temperature, ta ( ) 200 600 900 1200
tl1451 linear integrated circuit unisonic technologies co., ltd 14 of 14 www.unisonic.com.tw qw-r103-011.d 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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