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
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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
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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=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
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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 ΔTa=MIN ~ MAX(note 2) Short-Circuit Output Current IO(SC) VREF=0 35 Oscillator Section 10 Frequency F CT=0.01μF, RT=120kΩ All Values of VCC CT, RT, TA Standard Deviation of Frequency 10 constant 0.1 Frequency Change with Voltage VCC=7v ~ 40V,Ta=25°C CT=0.01μF, RT=12kΩ, ΔTa=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 ΔVOUT=3V, VOUT=0.5V ~ 3.5V GBW CMRR VCC=40V,TA=25°C 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 μA 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
μA μA V mA μA % 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=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:
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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
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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
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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.
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QW-R103-004,D