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| UNISONIC TECHNOLOGIES CO., LTD TL494 VOLTAGE MODE PWM CONTROL CIRCUIT DESCRIPTION The UTC TL494 incorporates all the functions required in the construction of a pulse-width modulation switching circuit. Designed primarily for switching power supply control or DC-DC convectors, it offers the systems engineer the flexibility to tailor control circuitry to its own application. DIP-16 SOP-16 LINEAR INTEGRATED CIRCUIT FEATURES *Complete PWM power control circuitry *Uncommitted outputs for 200mA sink or source current *Output control selects single ended or push pull operation *Internal circuitry prohibits double pulses over total range *Easy synchronization *Pb-free plating product number: TL494L ORDERING INFORMATION Normal TL494-D16-T TL494-S16-R TL494-S16-T Order Number Lead Free Plating TL494L-D16-T TL494L-S16-R TL494L-S16-T Package DIP-16 SOP-16 SOP-16 Packing Tube Tape Reel Tube TL494L-D16-T (1)Packing Type (2)Package Type (3)Lead Plating (1) R: Tape Reel, T: Tube (2) D16: DIP-16, S16: SOP-16 (3) L: Lead Free Plating, Blank: Pb/Sn www.unisonic.com.tw Copyright (c) 2005 Unisonic Technologies Co., Ltd 1 of 7 QW-R103-004,D TL494 PIN CONFIGURATIONS LINEAR INTEGRATED CIRCUIT BLOCK DIAGRAM 13 Pulse Steering Flip-Flop RT 6 CT 5 oscillator T Input control Q 8 Q1 C1 9 E1 11 C2 Q Q2 10 E2 dead time comparator 4 dead time control PWM comparator 0.7mA 1 2 Error Amplifier Error Amplifier 16 15 14 VREF 5V reference regulation 12 Vcc 7 GND UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 2 of 7 QW-R103-004,D TL494 ABSOLUTE MAXIMUM RATINGS LINEAR INTEGRATED CIRCUIT (Unless otherwise noted all is over operating free air temperature range) PARAMETER SYMBOL Supply Voltage(Note 3) VCC Amplifier Input Voltage VIN Collector Output Voltage VOUT Collector Output Current ICO Ta=25C Continuous Total Dissipation PD Derate at Ta25C RATINGS UNIT 41 V VCC+0.3 V 41 V 250 mA 1000 mW 9.2 mW/C Junction Temperature TJ 125 C Operating Temperature TOPR -25 ~ +85 C Storage Temperature TSTG -40 ~ +150 C Note 1. Absolute maximum ratings are those values beyond which the device could be permanently damaged. Absolute maximum ratings are stress ratings only and functional device operation is not implied. 2. All voltage values, except differential voltages are with respect to the network ground terminal. RECOMMENDED OPERATING CONDITIONS PARAMETER Supply Voltage Amplifier Input Voltage Collector Output Voltage Collector Output Current(each Transistor) Current into Feedback Timing Capacitor Timing Resistor Oscillator Frequency Operating Free-Air Temperature SYMBOL VCC VIN VOUT Ic If CT RT fosc Ta RATINGS MIN 7 -0.3 MAX 40 Vcc-2 40 200 0.3 10000 500 300 70 UNIT V V V mA mA nF k kHz C 0.47 1.8 1 0 UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 3 of 7 QW-R103-004,D TL494 ELECTRICAL CHARACTERISTICS LINEAR INTEGRATED CIRCUIT (Over recommended operating free-air temperature range, VCC=15V,f=1kHz,Unless otherwise specified) PARAMETER SYMBOL TEST CONDITIONS MIN TYP Reference Section Output Voltage VOUT IOUT=1mA 4.75 5 Input Regulation VIN VCC=7V ~ 40V 2 Output Regulation VOUT IOUT=1 ~ 10mA 1 Output Voltage Change with Temperature 0.2 Ta=MIN ~ MAX(note 2) Short-Circuit Output Current IO(SC) VREF=0 35 Oscillator Section 10 Frequency F CT=0.01F, RT=120k All Values of VCC CT, RT, TA Standard Deviation of Frequency 10 constant 0.1 Frequency Change with Voltage VCC=7v ~ 40V,Ta=25C CT=0.01F, RT=12k, Ta=MIN Frequency Change with Temperature ~ MAX Amplifier Section Input Offset Voltage Error VI(OFF) VOUT(pin 3)=2.5V 2 Input Offset Current II(OFF) VOUT (pin 3)=2.5V 25 0.2 Input Bias Current II(BIAS) VOUT (pin 3)=2.5V Common-Mode Input Voltage Range Error Open-Loop Voltage Amplification Unity-Gain Bandwidth Common-Mode Rejection Ratio Output Sink Current(pin 3) Output source Current(pin 3) Output Section Collector off-state current Emitter off-state Current Collector -emitter Common-emitter Saturation Voltage Emitter-Follower Output Control Input Current Dead Time Control Section Input bias (pin 4) Maximum duty cycle, each output Input threshold Voltage(pin 4) PWM comparator Section Input Threshold Voltage(pin 3) Input Sink Current (pin 3) Total Device Standby Supply Current VCC =15V VCC =40V VCC=7V ~ 40 V VOUT=3V, VOUT=0.5V ~ 3.5V GBW CMRR VCC=40V,TA=25C VID=-15mV ~ -5V IO(SINK) V(pin 3)=0.5V IO(SOURCE) VID=15mV ~ -5V, V(pin 3)=3.5V IC(OFF) IE(OFF) VCE=40V, VCC=40V VCC=VC=40V, VE=0 VE=0, IC=200mA VC=15V, IE=-200mA VIN=VREF VIN=0 ~ 5.25V VIN(pin 40=0 Zero duty Cycle Maximum duty cycle Zero Duty cycle Vpin 3= 0.7V pin 6 at VREF, all other Inputs and outputs open -0.3 ~ Vcc-2 MAX UNIT 5.25 25 15 1 V mV mV % mA kHz % % 12 10 250 1 % mV nA A V 70 65 0.3 -2 Error 95 800 80 0.7 dB kHz dB mA mA 2 1.1 1.5 100 -100 1.3 2.5 3.5 -10 3.3 A A V mA A % V II(BIAS) VTHR -2 45 3 0 4 0.7 6 9 7.5 VTHR II(SINK) IST-BY 4.5 0.3 V mA mA mA ns ns ns ns 10 15 Average supply current Vpin 4=2V Switching Characteristics, Ta=25C Output Voltage Rise Time tR 100 200 Common-emitter configuration Output Voltage Fall Time tF 25 100 Output Voltage Rise Time tR 100 200 Emitter-follower configuration Output Voltage Fall Time tF 40 100 Note 1:All typical Values except for temperature coefficient are at Ta=25C. Note 2:For conditions shown as MIN or MAX, use appropriate value under recommended operating conditions. Note 3:Duration of the short-circuit should not exceed one second. Note 4:Standard deviation is a measure of the statistical distribution the mean as derived from the formula: UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 4 of 7 QW-R103-004,D TL494 TEST CIRCUIT LINEAR INTEGRATED CIRCUIT Vcc=15V TEST INPUTS 12 4 3 12k 6 5 0.01 F 1 2 16 15 13 2W 150 2W 150 DEAD-TIME FEEDBACK RT CT Vcc C1 E1 8 9 OUTPUT 1 C2 E2 11 10 OUTPUT 2 ERROR AMPLIFIER 50k OUTPUT CONTROL VREF OUTPUT GND 7 14 VOLTAGE at C1 VOLTAGE at C2 VOLTAGE at CT DEAD-TIME CONTROL INPUT THRESHOLD VOLTAGE THRESHOLD VOLTAGE FEEDBACK FIG 1. OPERATIONAL TEST CIRCUIT AND WAVEFORMS UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 5 of 7 QW-R103-004,D TL494 TEST CIRCUIT(Cont.) LINEAR INTEGRATED CIRCUIT 1 Vin 2 16 Vref 15 ERROR AMPLIFIER FEEDBACK TERMINAL ERROR AMPLIFIER FIG 2. AMPLIFIER CHARACTERISTICS UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 6 of 7 QW-R103-004,D TL494 TYPICAL PERFORMANCE CHARACTERISTICS LINEAR INTEGRATED CIRCUIT 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. UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 7 of 7 QW-R103-004,D |
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