unisonic technologies co., ltd tl594 linear integrated circuit www.unisonic.com.tw 1 of 9 copyright ? 2009 unisonic technologies co., ltd qw-r103-031.b pulse-width-modulation control circuit ? description the utc tl594 is a pwm (pulse width modulation) control circuit, incorporating two error amplifiers, an on-chip adjustable oscillator, a dtc (deadtime contro l) comparator, a pulse-steering control flip-flop, a regulator rated 5v with 1% accuracy, an uvlo (undervoltage lockout) control circui t and an output control circuit. the two error amplifiers have a common-mode voltage varies from -0.3 v to vcc-2 v. the dtc compar ator with a fixed-offset offers dead time nearly 5%. the uvlo circuit forbids the output until the internal circuitry is operational. the internal oscillator is used to drive the common circuits in synchronous multiple-rail power supplies, when be bypassed by terminating rt to the reference output and providing an external input of sawtooth to ct. the uncommitted output transistors have the capabilities of either common-emitter or emitter-f ollower output. the output control can select the push-pull or singl e-ended output operation for each device. this chip is not allowe d to appear the double pulse status for either output during push-pull output operation due to its structure. the utc tl594 is generally used for the power supply control circuits, which apply to a large area. ? features * adjustable dead time * uncommitted outputs transistor rated to 200ma sink or source current * single-ended or push-pull operat ion selected by output control * double pulse is not allowed at either output due to its architecture * 5v internal reference voltage (1% accuracy) * uvlo under the low v cc status dip-16 sop-16 ? ordering information order number lead free halogen free package packing tl594l-d16-t tl594g-d16-t dip-16 tube tl594l-s16-r TL594G-S16-R sop-16 tape reel
tl594 linear integrated circuit unisonic technologies co., ltd 2 of 9 www.unisonic.com.tw qw-r103-031.b ? pin configuration 7 6 5 4 3 2 1 14 13 12 10 11 15 16 1in+ 1in- feedback dtc ct rt gnd 2in+ 2in- output ctrl c2 v cc ref e2 8 9 c1 e1 pin no pin name description 1 1in+ the noninv input of error amp 1 2 1in- the inv input of error amp 1 3 reedback input of feedback pwm comparator 4 dtc the deadtime can be set by changing the voltage of this pin 5 ct a capacitor connected to this pin sets the fixed switching frequency 6 rt a resistor connected to this pin sets the fixed switching frequency 7 gnd this is gnd pin 8 c1 collector of output transistors q1 9 e1 emitter of output transistors q1 10 e2 emitter of output transistors q2 11 c2 collector of output transistors q2 12 vcc this pin is connected to the ic supply power. 13 output ctrl a external signal connect to this pin can contro l the state of output 14 ref internal reference voltage 5v with 1.5% accuracy 15 2in- the inv input of error amp 2 16 2in+ the noninv input of error amp 2
tl594 linear integrated circuit unisonic technologies co., ltd 3 of 9 www.unisonic.com.tw qw-r103-031.b ? block diagram ? function table input output ctrl output function v i = 0 single-ended or parallel output v i = v ref normal push-pull operation
tl594 linear integrated circuit unisonic technologies co., ltd 4 of 9 www.unisonic.com.tw qw-r103-031.b ? absolute maximum ratings (unless otherwise specified)) parameter symbol ratings unit supply voltage v cc 41 v amplifier input voltage v in v cc + 0.3 v collector output voltage v c1, v c2 41 v collector output current i c1, i c2 250 ma junction temperature t j +150 c operating temperature t opr -40 ~ +85 c storage temperature t stg -65 ~ +150 c note: absolute maximum ratings are those values beyo nd which the device could be permanently damaged. absolute maximum ratings are stress ratings only and functional device oper ation is not implied. ? thermal data parameter symbol ratings unit dip-16 67 junction to ambient (note) sop-16 ja 64 c/w note: maximum power dissipation is a function of t j(max) , ja , and ta. the maximum allowable power dissipation at any allowable ambient temperature is p d = (t j(max) -ta)/ ja . operating at the absolute maximum t j of 150c can affect reliability. ? recommended operating conditions parameter symbol min typ. max unit supply voltage v cc 7 40 v amplifier input voltage v in -0.3 v cc -2 v collector output voltage v c1 , v c2 40 v collector output current (each transistor) i c1 , i c2 200 ma current into feedback terminal l fb 0.3 ma timing capacitor c t 0.47 10000 nf timing resistor r t 1.8 500 k ? oscillator frequency f osc 1 300 khz ? electrical characteristics ( v cc =15v, unless otherwise specified) parameter symbol test conditions min typ max unit reference section output voltage (ref) v ref i out = 1ma, ta = 25c 4.95 5 5.05 v input regulation v out v cc = 7v~40v, ta = 25c 2 25 mv output regulation v out i out = 1~10ma, ta = 25c 14 35 mv output-voltage change with temperature ta =min~max 2 10 mv/v short-circuit output current (note) i sc v ref = 0v 10 35 50 ma oscillator section, c t = 0.01 f, r t = 12k ? (see figure 1) frequency f osc 10 khz standard deviation of frequency (note) f osc all values of v cc , c t , r t , and ta constant 100 hz/khz frequency change with voltage f osc ( v) v cc = 7v ~ 40v, ta = 25c 1 hz/khz frequency change with temperature f osc ( t) ta =min~max 50 hz/khz dead-time control section (see figure 1) input bias current i ib (dt) v in = 0 ~ 5.25v -2 -10 a maximum duty cycle, each output dc max dtc = 0v 0.45 zero duty cycle 3 3.3 v input threshold voltage v th maximum duty cycle 0 v
tl594 linear integrated circuit unisonic technologies co., ltd 5 of 9 www.unisonic.com.tw qw-r103-031.b ? electrical characteristics(cont.) parameter symbol test conditions min typ max unit output section common emitter v sat(c) v e =0, i c =200ma 1.1 1.3 v collector-emitter saturation voltage emitter follower v sat(e) v c =15v, i e = ? 200ma 1.5 2.5 v v c =40v, v e =0v, v cc =40v 2 100 a collector off-state current i c(off) dtc and output ctrl = 0v, v c =15v, v e =0v, v cc =1~3v 4 200 a emitter off-state current i e(off) v cc =v c =40v, v e =0 -100 a output control input current i oc v in =v ref 3.5 ma pwm comparator section (see figure 1) input threshold voltage v th zero duty cycle 4 4.5 v input sink current i i(sink) feedback = 0.5v 0.3 0.7 ma undervoltage lockout section (see figure 1) ta = 25c 6 v threshold voltage v th ta =min~max 3.5 6.9 v hysteresis v hys 100 mv overall device v cc = 15v 9 15 ma standby supply current i stn-by r t at v ref all other inputs and outputs open v cc = 40v 11 18 ma average supply current dtc = 2v, see figure 1 12.4 ma amplifier section (see figure 2) input offset voltage, error amplifier v i(off) feedback = 2.5v 2 10 mv input offset current i i(off) feedback = 2.5v 25 250 na input bias current i ib feedback = 2.5v 0.2 1 a common-mode input voltage range, error amplifier v icr v cc =7v~40v 0.3 to v cc -2 v open-loop voltage amplification gain, error amplifier a vol v out =3v, r l =2k ? , v out = 0.5v~3.5v 70 95 db unity-gain bandwidth b w v out = 0.5v ~3.5v, r l =2k ? 800 khz common-mode rejection ratio, error amplifier cmrr v cc = 40v, ta=25c 65 80 db output sink current, feedback i o(sink) v id =-15mv~-5v, feedback = 0.5v 0.3 0.7 ma output source current, feedback i o(source) v id = 15mv~5v, feedback = 3.5v -2 ma switching characteristics, ta = 25c output-voltage rise time t r 200 400 ns output-voltage fall time t f emitter-follower config uration (see figure 3) 45 100 ns output-voltage rise time t r 100 200 ns output-voltage fall time t f common-emitter configuration (se e figure 4) 30 100 ns note: standard deviation is a measure of the statistical distribution about the mean, as derived from the formula: 1 - n ) x - x ( = 2 n 1 = n n
tl594 linear integrated circuit unisonic technologies co., ltd 6 of 9 www.unisonic.com.tw qw-r103-031.b ? parameter measurement information 50k 12k v cc =15v 12 v cc c1 e1 c2 e2 10 11 9 8 4 3 dtc feedback 6 5 r t c t 1 2 16 15 in+ in+ in- in- 13 error amplifiers gnd 7 14 ref output ctrl test input test input output 1 output 2 150 2w 150 2w 0.01 f figure 1. operational test circuit figure 2. amplifier-characteristics test circuit
tl594 linear integrated circuit unisonic technologies co., ltd 7 of 9 www.unisonic.com.tw qw-r103-031.b ? parameter measurement information(cont.) test circuit output-voltage waveform 15v output c l =15pf each output circuit (includes probe and jig capacitance ) 68 ? 2w t f t r 90% 90% 10% 10% figure 3. emitter-follower configuration test circuit output-voltage waveform t f t r 90% 90% 10% 10% figure 4. common-emitter configuration
tl594 linear integrated circuit unisonic technologies co., ltd 8 of 9 www.unisonic.com.tw qw-r103-031.b ? typical applications information + note: all capacitors in f push-pull operation single-ended operation
tl594 linear integrated circuit unisonic technologies co., ltd 9 of 9 www.unisonic.com.tw qw-r103-031.b ? typical characteristic oscillator frequency (hz) note: frequency variation ( f) is the change in oscillator frequency th at occurs over the full temperature range. 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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