TL494

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. 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 Lead Free:TL494L Halogen Free:TL494G ORDERING INFORMATION Normal TL494-D16-T TL494-S16-R Ordering Number Lead Free Plating TL494L-D16-T TL494L-S16-R Halogen Free TL494G-D16-T TL494G-S16-R Package DIP-16 SOP-16 Packing Tube Tape Reel www.unisonic.com.tw Copyright © 2009 Unisonic Technologies Co., Ltd 1 of 7 QW-R103-004,F TL494 PIN CONFIGURATION 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,F 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=25°C Continuous Total Dissipation PD Derate at Ta＞25°C 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 kΩ kHz °C 0.47 1.8 1 0 UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 3 of 7 QW-R103-004,F 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 MAX Reference Section Output Voltage VOUT IOUT=1mA 4.75 5 5.25 Input Regulation VIN VCC=7V ~ 40V 2 25 Output Regulation VOUT IOUT=1 ~ 10mA 1 15 Output Voltage Change with Temperature ΔTa=MIN ~ MAX(note 2) 0.2 1 Short-Circuit Output Current IO(SC) VREF=0 35 Oscillator Section Frequency F CT=0.01μF, RT=12kΩ 10 All Values of VCC CT, RT, TA 10 Standard Deviation of Frequency constant Frequency Change with Voltage VCC=7V ~ 40V,Ta=25°C 0.1 CT=0.01μF, RT=12kΩ, Frequency Change with Temperature 12 ΔTa=MIN ~ MAX Amplifier Section Input Offset Voltage Error VI(OFF) VOUT (pin 3)=2.5V 2 10 Input Offset Current II(OFF) VOUT (pin 3)=2.5V 25 250 Input Bias Current II(BIAS) VOUT (pin 3)=2.5V 0.2 1 -0.3 ~ Common-Mode Input Voltage Range Error VCC=7V ~ 40 V Vcc-2 Open-Loop Voltage Amplification ΔVOUT=3V, VOUT=0.5V ~ 3.5V 70 95 Unity-Gain Bandwidth GBW 800 Common-Mode Rejection Ratio Error CMRR VCC=40V,TA=25°C 65 80 VID=-15mV ~ -5V 0.3 0.7 Output Sink Current(pin 3) IO(SINK) V(pin 3)=0.5V Output source Current(pin 3) IO(SOURCE) VID=15mV ~ -5V, V(pin 3)=3.5V -2 Output Section Collector off-state current IC(OFF) VCE=40V, VCC=40V 2 100 Emitter off-state Current IE(OFF) VCC=VC=40V, VE=0 -100 Collector -emitter Common-emitter VE=0, IC=200mA 1.1 1.3 Saturation Voltage Emitter-Follower VC=15V, IE=-200mA 1.5 2.5 Output Control Input Current VIN=VREF 3.5 Dead Time Control Section Input bias (pin 4) II(BIAS) VIN=0 ~ 5.25V -2 -10 Maximum duty cycle, each output VIN(pin 40)=0 45 Input threshold Voltage(pin 4) VTHR Zero duty Cycle 3 3.3 Maximum duty cycle 0 PWM comparator Section Input Threshold Voltage(pin 3) VTHR Zero Duty cycle 4 4.5 Input Sink Current (pin 3) II(SINK) V(pin 3)= 0.7V 0.3 0.7 Total Device 6 10 VCC =15V pin 6 at VREF, all other Inputs and Standby Supply Current IST-BY outputs open 9 15 VCC =40V Average supply current V(pin 4)=2V 7.5 Switching Characteristics, Ta=25°C 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=25°C. 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: UNIT V mV mV % mA kHz % % % mV nA μA V dB kHz dB mA mA μA μA V mA μA % V V mA mA mA ns ns ns ns UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 4 of 7 QW-R103-004,F 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,F 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,F 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,F