UNISONIC TECHNOLOGIES CO., LTD TL494 LINEAR INTEGRATED CIRCUIT 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. 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 www.unisonic.com.tw Copyright © 2009 Unisonic Technologies Co., Ltd Package Packing DIP-16 SOP-16 Tube Tape Reel 1 of 7 QW-R103-004,F TL494 LINEAR INTEGRATED CIRCUIT PIN CONFIGURATION BLOCK DIAGRAM Input control Pulse Steering Flip-Flop 8 9 E1 11 C2 T oscillator CT 5 C1 Q1 Q RT 6 13 Q2 Q 10 E2 dead time comparator 14 VREF 4 dead time control 5V reference regulation PWM comparator 12 Vcc 0.7mA 1 16 2 15 Error Amplifier Error Amplifier UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 7 GND 2 of 7 QW-R103-004,F TL494 LINEAR INTEGRATED CIRCUIT ABSOLUTE MAXIMUM RATINGS (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 UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw SYMBOL VCC VIN VOUT Ic If CT RT fosc Ta RATINGS MIN 7 -0.3 0.47 1.8 1 0 MAX 40 Vcc-2 40 200 0.3 10000 500 300 70 UNIT V V V mA mA nF kΩ kHz °C 3 of 7 QW-R103-004,F TL494 LINEAR INTEGRATED CIRCUIT ELECTRICAL CHARACTERISTICS (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: UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 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 4 of 7 QW-R103-004,F TL494 LINEAR INTEGRATED CIRCUIT TEST CIRCUIT Vcc=15V 2W 150 12 TEST INPUTS 4 3 12k 6 5 0.01 F DEAD-TIME Vcc FEEDBACK C1 E1 2W 150 8 OUTPUT 1 9 RT CT 1 C2 E2 11 10 OUTPUT 2 2 16 ERROR AMPLIFIER 15 13 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 LINEAR INTEGRATED CIRCUIT TEST CIRCUIT(Cont.) 1 Vin 2 ERROR AMPLIFIER FEEDBACK TERMINAL 16 Vref 15 ERROR AMPLIFIER FIG 2. AMPLIFIER CHARACTERISTICS UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 6 of 7 QW-R103-004,F TL494 LINEAR INTEGRATED CIRCUIT TYPICAL PERFORMANCE CHARACTERISTICS 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