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intelligent voltage mode pwm ic ka3511/d general description the ka3511/d is a fixed-frequency improved- performance pulse-width modulation control circuit with complete housekeeping circuitry for use in the secondary side of smps (switched mode power supply). it contains various functions, which are precision voltage reference, over voltage protection, under voltage protection, remote on/off control, power good signal generator and etc. ovp (over voltage protection) section it has ovp functions for +3.3v,+5v,+12v and pt outputs. the circuit is made up of a comparator with four detecting inputs and without hysteresis voltage. especially, pt (pin16) is prepared for an extra ovp input or another protection signal. uvp (under voltage protection) section it also has uvp functions for +3.3v, +5v, +12v outputs. the block is made up of a comparator with three detecting inputs and without hysteresis voltage. remote on/off section remote on/off section is used to control smps externally. if a high signal is supplied to the remote on/ off input, pwm signal becomes a high state and all secondary outputs are grounded. the remote on/off signal is transferred with some on-delay and off-delay time of 8ms, 24ms respectively. precision reference section the reference voltage trimmed to 2% (4.9v vref 5.1v) pg (power good signal generator) section power good signal generator is to monitor the voltage level of power supply for safe operation of a microprocessor. ka3511 requires few external components to accomplish a complete housekeeping circuits for smps. the ka3511 is available in a 22-pin dual in-line package. ordering information features ? complete pwm control and house keeping circuitry few external components precision voltage reference trimmed to 2% dual output for push-pull operation each output tr for 200ma sink current variable duty cycle by dead time control soft start capability by using dead time control double pulse suppression logic over voltage protection for 3.3v / 5v / 12v under voltage protection for 3.3v / 5v / 12v one more external input for various protection (pt) remote on/off control function (ps-on) latch function controlled by remote and protection input power good signal generator with hysteresis device package operating temperature ka3511 22 dip -25 c ~ 85 c KA3511D 24 sop -25 c ~ 85 c 22-dip-400 / 24-sop-300 .com .com .com 4 .com u datasheet
ka3511/d intelligent voltage mode pwm block diagram 7 8 oscillator 2 3 4 19 12 vref start up 1 9 delay controller 17 18 10 20 22 21 5 6 t rem 11 16 13 14 15 pt v12 v5 v3.3 pg rem (ps-on) e c2 c1 remote on/off 1.4v 1.25v vref 5v ovp comp 1.25v uvp comp gnd t uvp 2.2uf t pg 2.2uf comp3 1.8v 0.6v 1.8v 0.6v pg generator vref ichag comp2 comp1 1.25v 0.1v dead time controller pwm control q r s ck dq q 1.25v internal bias 5v det v cc vref dead time control e/a(+) e/a(-) v5 v12 comp c t r t .com .com .com .com 4 .com u datasheet
intelligent voltage mode pwm ic ka3511/d pin description : ka3511 pin no. name i/o function pin no. name i/o function 1v cc i supply voltage 12 vref o precision reference vtg 2 comp o e/a output 13 v3.3 i ovp, uvp input for 3.3v 3 e/a(-) i e/a (-) input 14 v5 i ovp, uvp input for 5v 4 e/a(+) i e/a (+) input 15 v12 i ovp, uvp input for 12v 5 trem ? remote on/off delay 16 pt i extra protection input 6 rem i remote on/off input 17 t uvp ? uvp delay 7 rt ? oscillation freq. setting r 18 gnd ? signal ground 8 ct ? oscillation freq. setting c 19 dtc i deadtime control input 9 det i detect input 20 c2 o output 2 10 t pg ? pg delay 21 e ? power ground 11 pg o power good signal output 22 c1 o output 1 ka3511 v cc comp e/a(-) ea(+) trem rem rt ct det tpg pg #1 #11 vref #12 v3.3 #22 v5 v12 pt tuvp gnd dtc c2 e c1 .com .com .com .com 4 .com u datasheet
ka3511/d intelligent voltage mode pwm pin description : KA3511D pin no. name i/o function pin no. name i/o function 1v cc i supply voltage 13 nc - nc 2 comp o e/a output 14 vref o precision reference vtg 3 e/a(-) i e/a (-) input 15 v3.3 i ovp, uvp input for 3.3v 4 e/a(+) i e/a (+) input 16 v5 i ovp, uvp input for 5v 5 trem ? remote on/off delay 17 v12 i ovp, uvp input for 12v 6 rem i remote on/off input 18 pt i extra protection input 7 rt ? oscillation freq. setting r 19 t uvp ? uvp delay 8 ct ? oscillation freq. setting c 20 gnd ? signal ground 9 det i detect input 21 dtc i deadtime control input 10 t pg ? pg delay 22 c2 o output 2 11 pg o power good signal output 23 e ? power ground 12 nc - nc 24 c1 o output 1 KA3511D #1 #12 #13 #24 vcc comp e/a(-) ea(+) trem rem rt ct det tpg pg nc c1 ec2dtcgndtuvp pt v12 v5 v3.3 vref nc .com .com .com .com 4 .com u datasheet
intelligent voltage mode pwm ic ka3511/d pin no. name function 1v cc supply voltage. operating range is 14v~30v. v cc =20v, ta=25 c at test. 2 comp error amplifier output. it is connect to non-inverting input of pulse width modulator comparator. 3 e/a(-) error amplifier inverting input. its reference voltage is always 1.25v. 4 e/a(+) error amplifier non-inverting input feedback voltage.this pin may be used to sense power supply output voltage. 5 trem remote on/off delay. ton/toff=8ms/24ms (typ.) with c=0.1uf. its high/low threshold voltage is 1.8v/0.6v. 6 rem remote on/off input. it is ttl operation and its threshold voltage is 1.4v. voltage at this pin can reach normal 4.6v, with absolutely maximum voltage, 5.25v. if rem = ? low ? , pwm = ? low ? . that means the main smps is operational. when rem = ? high ? , then pwm = ? high ? and the main smps is turned-off. 7 rt oscillation frequency setting r. (test condition r t =10k ? ) 8 ct oscillation frequency setting c. (test condition c t =0.01uf) 9 det under-voltage detect pin. its threshold voltage is 1.25v typ. 10 t pg pg delay. td=250ms (typ) with c pg =2.2uf. the high/low threshold voltage are 1.8v/0.6v and the voltage of pin10 is clamped at 2.9v for noise margin. 11 pg power good output signal. pg = ? high ? means that the power is ? good ? for operation and pg = ? low ? means ? power fail ? . 12(14) vref precision voltage reference trimmed to 2%. (typical value = 5.03v) 13(15) v3.3 over voltage protection for output 3.3v. (typical value = 4.1v) 14(16) v5 over voltage protection for output 5v. (typical value = 6.2v) 15(17) v12 over voltage protection for output 12v. (typical value = 14.2v) 16(18) pt this is prepared for an extra ovp input or another protection signal. (typical value = 1.25v) 17(19) t uvp timing pin for under voltage protection blank-out time. its threshold voltage is 1.8v and clamped at 2.9v after full charging. target of delay time is 250ms and it is realized through external (c=2.2uf). 18(20) gnd signal ground. 19(21) dtc deadtime control input. the dead-time control comparator has an effective 120mv input offset which limits the minimum output dead time. dead time may be imposed on the output by setting the dead time control input to a fixed voltage, ranging between 0v to 3.3v. 20(22) c2 output drive pin for push-pull operation. 21(23) e power ground. 22(24) c1 output drive pin for push-pull operation. .com .com .com .com 4 .com u datasheet
ka3511/d intelligent voltage mode pwm absolute maximum ratings temperature characteristics characteristic symbol value unit supply voltage v cc 40 v collector output voltage v c1 , v c2 40 v collector output current i c1 , i c2 200 ma power dissipation(KA3511D) p d 0.8 w power dissipation(ka3511) p d 1.5 w operating temperature t opr ? 25 to 85 c storage temperature t stg ? 65 to 150 c characteristic symbol value unit min. typ. max. temperature coefficient of vref (-25 c ta 85 c) ? vref/ ? t ? 0.01 ? %/ c .com .com .com .com 4 .com u datasheet
intelligent voltage mode pwm ic ka3511/d electrical characteristics (v cc =20v, t a =25 c) characteristic symbol test condition value unit min. typ. max. reference section reference output voltage vref iref=1ma 4.9 5 5.1 v line regulation ? vref. line 14v v cc 30v ? 2.0 25 mv load regulation ? vref. load 1ma iref 10ma ? 1.0 15 mv temperature coefficient of vref (1) ? vref/ ? t-25 c ta 85 c ? 0.01 ? %/ c short-circuit output current i sc vref=0 15 35 75 ma oscillator section oscillation frequency fosc c t =0.01uf, r t =12k?10?khz frequency change with temperature (1) fosc/t c t =0.01uf, r t =12k ? 2 ? % dead time control section input bias current i b(dt) ? -2.0 -10 ua maximum duty voltage dc max pin19 (dtc)=0v 45 48 50 % input threshold voltage v th(dt) zero duty cycle ? 3.0 3.3 v max. duty cycle 0 ? ? error amp section inverting reference voltage vref(ea) 1.20 1.25 1.30 v input bias current i b(ea) v comp =2.5v ? -0.1 -1.0 ua open-loop voltage gain (1) g vo 0.5v v comp 3.5v 70 95 ? db unit-gain bandwidth (1) bw ? 650 ? khz output sink current i sink v comp =0.7v 0.3 0.9 ? ma output source current i source v comp =3.5v -2.0 -4.0 ? ma pwm comparator section input threshold voltage v th(pwm) zero duty cycle ? 4 4.5 v output section output saturation voltage v ce(sat) i c =200ma ? 1.1 1.3 v collector off-state current i c(off) v cc =v c =30v, v e =0v ? 2 100 ua rising time t r ? 100 200 ns falling time t f ? 50 200 ns protection section over voltage protection for 3.3v v ovp1 3.8 4.1 4.3 v .com .com .com .com 4 .com u datasheet
ka3511/d intelligent voltage mode pwm electrical characteristics (continued) notes: 1. these parameters, although guaranteed over their recommended operating conditions are not 100% tested in production. 2. rem on delay time (pin6 rem: ? l ? ? h ? ), rem off delay time (pin6 rem: ? h ? ? l ? ) characteristic symbol test condition value unit min. typ. max. over voltage protection for 5v v ovp2 ? 5.8 6.2 6.6 v over voltage protection for 12v v ovp3 ? 13.5 14.2 15.0 v input threshold voltage for pt v pt ? 1.20 1.25 1.30 v under voltage protection for 3.3v v uvp1 ? 2.1 2.3 2.5 v under voltage protection for 5v v uvp2 ? 3.7 4.0 4.3 v under voltage protection for 12v v uvp3 ? 9.2 10 10.8 v charging current for uvp delay i chg.uvp c=2.2uf, v th =1.8v ? 10 ? 15 ? 23 ua uvp delay time t d.uvp c=2.2uf 100 260 500 ms remote on/off section rem on input voltage v remh i rem = ? 200ua 2.0 ? ? v rem off input voltage v reml ? ??0.8v rem off input bias voltage i reml v rem =0.4v ? ? ? 1.6 ma rem on open voltage v rem(open) ? 2.0 ? 5.25 v rem on delay time ton c=0.1uf 4 8 14 ms rem off delay time toff c=0.1uf 16 24 34 ms remote on/off section (2) detecting input voltage v in(det) ? 1.20 1.25 1.30 v detecting v5 voltage v5 (det) ? 4.1 4.3 4.5 v hysteresis voltage 1 hy1 comp1, 2 10 40 80 mv hysteresis voltage 2 hy2 comp3 0.6 1.2 ? v pg output load resistor r pg ? 0.5 1 2 k ? charging current for pg delay i chg.pg c=2.2uf, v th =1.8v ? 10 ? 15 ? 23 ua pg delay time t d.pg c=2.2uf 100 260 500 ms pg output saturation voltage v sat(pg) i pg =10ma ? 0.2 0.4 v total device stanby supply current i cc ? ?1020ma .com .com .com .com 4 .com u datasheet
intelligent voltage mode pwm ic ka3511/d application informations figure 1. oscillator frequency vs. timing resistance figure 2. operating waveform 300k 2k 5k 10k 20k 50k 100k 200k 500k 1m 100k 10k 1k 100 30 1k i o - oscillator frequency r t . timing resistance( ? ) vcc=15v 1.0 f 0.1 f ct=0.01 f 0.001 f feedback dead-time control ct ck q q output q1 output q2 .com .com .com .com 4 .com u datasheet
ka3511/d intelligent voltage mode pwm housekeeping circuit note) the ka3511 requires few external components to accomplish a complete housekeeping circuits for smps. 22 21 20 19 18 17 16 15 14 13 12 4 5 6 7 8 9 10 11 1 2 3 vcc comp e/a(-) e/a(+) rem rt ct det t pg pg t rem c1 e c2 dtc gnd t uvp pt v12 v5 v3.3 vref 2k ? (1w) 15k ? 0.01uf 12k ? 2.2uf 1uf 2.2uf 2k ? (1w) 11k ? 33k ? 1.8k ? 0.1uf 1k ? 0.01uf + + + pg micom 12v 5v standby supply v cc =20v + + 12v 5v 3v k a 3 5 1 1 .com .com .com .com 4 .com u datasheet
intelligent voltage mode pwm ic ka3511/d typical characteristics v cc -i cc bandgap reference voltage pin19(dead time control voltage)-duty cycle ovp for 3.3v ovp for 5v ovp for 12v temperature characteristic 0.014 0.012 0.010 0.008 0.006 0.004 0.002 0.000 0 10 203040 supply voltage [v] 50 40 30 20 10 0 0.00.51.01.52.02.53.0 2.73 deadtime control voltage [v] 7 6 5 4 3 2 1 0 5.0 5.5 6.0 6.5 7.0 i cc [a] duty ratio [%] 31.1% 21.8% 12.8% v5 [v] 5.010 5.008 5.006 5.004 5.002 -40 -20 0 20 40 60 80 100 120 140 temp [ c] vref [v] v pg [v] 5 4 3 2 1 0 3.6 3.8 4.0 4.2 4.4 4.6 v3.3 [v] v pg [v] 5 4 3 2 1 0 14.0 14.2 14.4 14.6 14.8 15.0 v12 [v] v pg [v] .com .com .com .com 4 .com u datasheet
ka3511/d intelligent voltage mode pwm ovp for pt uvp for 3.3v uvp for 5v uvp for 12v remote on charging current rem on/off vth 5 4 3 2 1 0 1.15 1.20 1.25 1.30 1.35 vpt [v] v pg [v] v pg [v] pin 13 (v3.3) voltage [v] 5 4 3 2 1 0 21 22 23 24 25 v pg [v] 5 4 3 2 1 0 3.6 3.8 4.0 4.2 4.4 4.6 4.8 5.0 pin 14 (v5) voltage [v] pin 15 (v12) voltage [v] 5 4 3 2 1 0 9.0 9.5 10.0 10.5 11.0 v pg [v] 5 4 3 2 1 0 012345 v pg [v] vrem [v] -0.000016 -0.000018 -0.000020 -0.000022 -0.000024 0 50 100 150 200 250 irem [a] .com .com .com .com 4 .com u datasheet
intelligent voltage mode pwm ic ka3511/d remote on open voltage detecting v cc voltage (det) detecting v5 voltage charging current for pg short circuit current hysteresis voltage 2 5 4 3 2 1 0 012345 vrem [v] v pg [v] 5 4 3 2 1 0 1.0 1.1 1.2 1.3 1.4 1.5 -0.000005 -0.000010 -0.000015 -0.000020 0 20 40 60 80 100 120 140 160 i pg [v] 5 4 3 2 1 0 4.0 4.2 4.4 4.6 4.8 5.0 pin 14 (5v) voltage [v] v pg [v] -0.032 -0.033 -0.034 -0.035 0 100 200 300 400 iref [a] 5 4 3 2 1 0 0.0 0.5 1.0 1.5 2.0 2.5 v pg [v] pin 9 (det) voltage [v] pin 10 (t pg ) voltage [v] .com .com .com .com 4 .com u datasheet
ka3511/d intelligent voltage mode pwm error amp sink current reference voltage 0.002 0.00 -0.002 -0.004 -0.006 -0.008 0 20 40 60 80 100 120 140 isink & isource [a] 5 4 3 2 1 0 010203040 vref [v] supply voltage [v] .com .com .com .com 4 .com u datasheet
intelligent voltage mode pwm ic ka3511/d experimental result ch1 : ps-on ch2 : +5vdc output ch3 : pg signal figure 3. rising time of +5vdc output voltage figure 4. pg signal delay time ch1 : ps-on ch2 : +5vdc output ch3 : pg signal .com .com .com .com 4 .com u datasheet
ka3511/d intelligent voltage mode pwm ch1 : ps-on ch2 : +5vdc output ch3 : pg signal ch1 : +3.3vdc output ch2 : +5vdc output ch3 : +12vdc output figure 5. power down warning figure 6. no load protection .com .com .com .com 4 .com u datasheet
intelligent voltage mode pwm ic ka3511/d figure 7. vcc, +5vdc output vs. pg signal (high) figure 8. vcc, +5vdc output vs. pg signal (low) ch1 : vcc ch2 : +5vdc output ch3 : pg signal ch1 : vcc ch2 : +5vdc output ch3 : pg signal .com .com .com .com 4 .com u datasheet
ka3511/d intelligent voltage mode pwm application circuit c6 22uf + 2.2uf + ic1 ar3511x vcc 1 c1 22 comp 2 e 21 e/a(-) 3 c2 20 dtc 19 e/a(+) 4 trem 5 gnd 18 rem 6 tuvp 17 rt 7 pt 16 ct 8 v12 15 det 9 v5 14 tpg 10 v3.3 13 pg 11 vref 12 ct 15k r5 70k r6 47k r4 1.2k r3 56k 100k 103 0.1uf + c16 + 2.2uf + 103 d19 d9 vr1 5v out 12v out power on out ref pg 3.3v out vcc c1 c2 .com .com .com .com 4 .com u datasheet
intelligent voltage mode pwm ic ka3511/d package dimension .com .com .com .com 4 .com u datasheet
ka3511/d intelligent voltage mode pwm package dimension .com .com .com .com 4 .com u datasheet
12/28/99 0.0m 001 stock#dsxxxxxxxx ? 1999 fairchild semiconductor corporation life support policy fairchild?s products are not authorized for use as critical components in life support devices or systems without the express written approval of the president of fairchild semiconductor corporation. as used herein: 1. life support devices or systems are devices or systems which, (a) are intended for surgical implant into the body, or (b) support or sustain life, and (c) whose failure to perform when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in a significant injury of the user. 2. a critical component in any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness. www.fairchildsemi.com .com .com .com 4 .com u datasheet

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