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UNISONIC TECHNOLOGIES CO., LTD TL494 LINEAR INTEGRATED CIRCUIT www.unisonic.com.tw 1 of 8 Copyright © 2013 Unisonic Technologies Co., Ltd QW-R103-004. I 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 system s 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 ORDERING INFORMATION Ordering Number Package Packing Lead Free Halogen Free TL494L-D16-T TL494G-D16-T DIP-16 Tube TL494L-P16-R TL494G-P16-R TSSOP-16 Tape Reel TL494L-P16-T TL494G-P16-T TSSOP-16 Tube TL494L-S16-R TL494G-S16-R SOP-16 Tape Reel TL494L-S16-T TL494G-S16-T SOP-16 Tube
TL494 LINEAR INTEGRATED CIRCUIT UNISONIC TECHNOLOGIES CO., LTD 2 of 8 www.unisonic.com.tw QW-R103-004. I PIN CONFIGURATION PIN DESCRIPTION PIN No. SYMBAL NAME AND FUNCTION 1, 16 NONINV INPUT Erro r Amplifier NONINV Input 2, 15 INV INPUT Error Amplifier INV Input
3 FEEDBACK Output Feedback Voltage
4 DEAD-TIME CONTROL Output DEAD-TIME Control
5 CT Timing Capacitor
6 RT Timing Resistor
7 GND Ground
8 C1 Internal Power NPN Collect1
9 E1 Internal Power NPN Emitter1
10 E2 Internal Power NPN Emitter2
11 C2 Internal Power NPN Collect2
12 VCC Supply Voltage
13 OUTPUT CONTROL Output mode select
14 VREF Reference Voltage
TL494 LINEAR INTEGRATED CIRCUIT UNISONIC TECHNOLOGIES CO., LTD 3 of 8 www.unisonic.com.tw QW-R103-004. I BLOCK DIAGRAM
TL494 LINEAR INTEGRATED CIRCUIT UNISONIC TECHNOLOGIES CO., LTD 4 of 8 www.unisonic.com.tw QW-R103-004. I ABSOLUTE MAXIMUM RATINGS (unless otherwise specified) PARAMETER SYMBOL RATINGS UNIT Supply Voltage(Note 3) V CC 41 V Amplifier Input Voltage V IN V CC+0.3 V Collector Output Voltage V OUT 41 V Collector Output Current I CO 250 mA Power Dissipation (TA=25C) PD 1000 mW Derate at TA＞25C 9.2 mW/ C Junction Temperature T J 125 C Operating Temperature T OPR -25 ~ +85 C Storage Temperature T STG -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 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 OUT 40 V Collector Output Current (each Transistor) I C 200 mA Current into Feedback I f 0.3 mA Timing Capacitor C T 0.47 10000 nF Timing Resistor R T 1.8 500 k Ω Oscillator Frequency f OSC 1 300 kHz Operating Free-Air Temperature T A 0 70 C ELECTRICAL CHARACTERISTICS (Over recommended operating free-air temperature range, VCC=15V, f=1kHz, unless otherwise specified) PARAMETER SYMBOL TEST CONDITIONS MIN TYP MAX UNIT REFERENCE SECTION Output Voltage V OUT I OUT=1mA 4.75 5 5.25 V Input Regulation V IN V CC=7V ~ 40V 2 25 mV Output Regulation V OUT I OUT=1 ~ 10mA 1 15 mV Output Voltage Change with Temperature TA=MIN ~ MAX(note 2) 0.2 1 % Short-Circuit Output Current I O(SC) V REF=0 35 mA OSCILLATOR SECTION Frequency F C T=0.01μF, RT=12kΩ 10 kHz Standard Deviation of Frequency All Values of VCC CT, RT, TA constant 10 % Frequency Change with Voltage V CC=7V ~ 40V,Ta=25C 0.1 % Frequency Change with Temperature CT=0.01μF, RT=12kΩ, TA=MIN ~ MAX 12 %
TL494 LINEAR INTEGRATED CIRCUIT UNISONIC TECHNOLOGIES CO., LTD 5 of 8 www.unisonic.com.tw QW-R103-004. I ELECTRICAL CHARACTERISTICS(Cont.) PARAMETER SYMBOL TEST CONDITIONS MIN TYP MAX UNIT AMPLIFIER SECTION Input Offset Voltage Error V I(OFF) VOUT (pin 3)=2.5V 2 10 mV Input Offset Current I I(OFF) V OUT (pin 3)=2.5V 25 250 nA Input Bias Current I I(BIAS) V OUT (pin 3)=2.5V 0.2 1 μA Common-Mode Input Voltage Range Error V CC=7V ~ 40 V -0.3 ~ VCC-2 V Open-Loop Voltage Amplification VOUT=3V, VOUT=0.5V ~ 3.5V 70 95 dB Unity-Gain Bandwidth GB W 800 kHz Common-Mode Rejection Ratio Error CMRR V CC=40V,TA=25C 65 80 dB Output Sink Current(pin 3) I O(SINK) VID=-15mV ~ -5V, V(pin 3)=0.5V 0.3 0.7 mA Output source Current(pin 3) I O(SOURCE) VID=15mV ~ -5V, V(pin 3)=3.5V -2 mA OUTPUT SECTION Collector off-state current I C(OFF) VCE=40V, VCC=40V 2 100 μA Emitter off-state Current I E(OFF) V CC=VC=40V, VE=0 -100 μA Collector -emitter Saturation Voltage Common-emitter V E=0, IC=200mA 1.1 1.3 V Emitter-Follower V C=15V, IE=-200mA 1.5 2.5 Output Control Input Current V IN=VREF 3.5 mA DEAD TIME CONTROL SECTION Input bias (pin 4) I I(BIAS) V IN=0 ~ 5.25V -2 -10 μA Maximum duty cycle, each output V IN(pin 4)=0 45 % Input threshold Voltage(pin 4) V THR Zero duty Cycle 3 3.3 V Maximum duty cycle 0 PWM COMPARATOR SECTION Input Threshold Voltage(pin 3) V THR Zero Duty cycle 4 4.5 V Input Sink Current (pin 3) I I(SINK) V(pin 3)= 0.7V 0.3 0.7 mA TOTAL DEVICE Standby Supply Current VCC =15V IST-BY pin 6 at VREF, all other Inputs and outputs open 6 10 mA VCC =40V 9 15 Average supply current V(pin 4)=2V 7.5 mA SWITCHING CHARACTERISTICS, TA=25C Output Voltage Rise Time t R Common-emitter configuration 100 200 ns Output Voltage Fall Time t F 25 100 ns Output Voltage Rise Time t R Emitter-follower configuration 100 200 ns Output Voltage Fall Time t F 40 100 ns Notes: 1. All typical Values except for temperature coefficient are at TA=25C. 2. For conditions shown as MIN or MAX, use appr opriate value under recommended operating conditions. 3. Duration of the short-circuit should not exceed one second. 4. Standard deviation is a measure of the statistical distribution the mean as derived from the formula:
TL494 LINEAR INTEGRATED CIRCUIT UNISONIC TECHNOLOGIES CO., LTD 6 of 8 www.unisonic.com.tw QW-R103-004. I TEST CIRCUIT DEAD-TIME FEEDBACK RT CT ERROR AMPLIFIER OUTPUT CONTROL GND C1Vcc TEST INPUTS Vcc=15V 2W 150 2W 150 OUTPUT 1 OUTPUT 2 VREF OUTPUT 50k 12k 0.01 F VOLTAGE at C1 DEAD-TIME CONTROL INPUT FEEDBACK VOLTAGE at C2 VOLTAGE at CT THRESHOLD VOLTAGE THRESHOLD VOLTAGE FIG 1. OPERATIONAL TEST CIRCUIT AND WAVEFORMS
TL494 LINEAR INTEGRATED CIRCUIT UNISONIC TECHNOLOGIES CO., LTD 7 of 8 www.unisonic.com.tw QW-R103-004. I TEST CIRCUIT(Cont.) Vin ERROR AMPLIFIER1 Vref ERROR AMPLIFIER FEEDBACK TERMINAL Fig. 2 AMPLIFIER CHARACTERISTICS
TL494 LINEAR INTEGRATED CIRCUIT UNISONIC TECHNOLOGIES CO., LTD 8 of 8 www.unisonic.com.tw QW-R103-004. I 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.