VOLTAGE MODE CONTROL CIRCUIT TL494 incorporates functions require

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VOLTAGE MODE CONTROL CIRCUIT TL494 incorporates functions require

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UNISONIC TECHNOLOGIES CO., TL494
VOLTAGE MODE CONTROL CIRCUIT
TL494 incorporates functions required construction pulse-width modulation switching circuit. Designed primarily switching power supply control DC-DC convectors, offers systems engineer flexibility tailor control circuitry application.
LINEAR INTEGRATED CIRCUIT
FEATURES
*Complete power control circuitry *Uncommitted outputs 200mA sink source current *Output control selects single ended 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.,
QW-R103-004,F
TL494
CONFIGURATION
LINEAR INTEGRATED CIRCUIT
BLOCK DIAGRAM
Pulse Steering Flip-Flop oscillator
Input control
dead time comparator dead time control comparator 0.7mA Error Amplifier Error Amplifier
VREF reference regulation
UNISONIC TECHNOLOGIES CO.,
www.unisonic.com.tw
QW-R103-004,F
TL494
ABSOLUTE MAXIMUM RATINGS
LINEAR INTEGRATED CIRCUIT
(Unless otherwise noted over operating free temperature range) PARAMETER SYMBOL Supply Voltage(Note Amplifier Input Voltage Collector Output Voltage VOUT Collector Output Current Ta=25°C Continuous Total Dissipation Derate Ta25°C
RATINGS UNIT VCC+0.3 1000 mW/°C Junction Temperature Operating Temperature TOPR Storage Temperature TSTG +150 Note Absolute maximum ratings those values beyond which device could permanently damaged. Absolute maximum ratings stress ratings only functional device operation implied. voltage values, except differential voltages with respect 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 VOUT fosc RATINGS -0.3 Vcc-2 10000 UNIT
0.47
UNISONIC TECHNOLOGIES CO.,
www.unisonic.com.tw
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 Reference Section Output Voltage VOUT IOUT=1mA 4.75 5.25 Input Regulation VCC=7V Output Regulation VOUT IOUT=1 10mA Output Voltage Change with Temperature Ta=MIN MAX(note Short-Circuit Output Current IO(SC) VREF=0 Oscillator Section Frequency CT=0.01F, RT=12k Values Standard Deviation Frequency constant Frequency Change with Voltage VCC=7V 40V,Ta=25°C CT=0.01F, RT=12k, Frequency Change with Temperature Ta=MIN Amplifier Section Input Offset Voltage Error VI(OFF) VOUT (pin 3)=2.5V Input Offset Current II(OFF) VOUT (pin 3)=2.5V Input Bias Current II(BIAS) VOUT (pin 3)=2.5V -0.3 Common-Mode Input Voltage Range Error VCC=7V Vcc-2 Open-Loop Voltage Amplification VOUT=3V, VOUT=0.5V 3.5V Unity-Gain Bandwidth Common-Mode Rejection Ratio Error CMRR VCC=40V,TA=25°C VID=-15mV Output Sink Current(pin IO(SINK) V(pin 3)=0.5V Output source Current(pin IO(SOURCE) VID=15mV -5V, V(pin 3)=3.5V Output Section Collector off-state current IC(OFF) VCE=40V, VCC=40V Emitter off-state Current IE(OFF) VCC=VC=40V, VE=0 -100 Collector -emitter Common-emitter VE=0, IC=200mA Saturation Voltage Emitter-Follower VC=15V, IE=-200mA Output Control Input Current VIN=VREF Dead Time Control Section Input bias (pin II(BIAS) VIN=0 5.25V Maximum duty cycle, each output VIN(pin 40)=0 Input threshold Voltage(pin VTHR Zero duty Cycle Maximum duty cycle comparator Section Input Threshold Voltage(pin VTHR Zero Duty cycle Input Sink Current (pin II(SINK) V(pin 0.7V Total Device =15V VREF, other Inputs Standby Supply Current IST-BY outputs open =40V Average supply current V(pin 4)=2V Switching Characteristics, Ta=25°C Output Voltage Rise Time Common-emitter configuration Output Voltage Fall Time Output Voltage Rise Time Emitter-follower configuration Output Voltage Fall Time Note 1:All typical Values except temperature coefficient Ta=25°C. Note 2:For conditions shown MAX, appropriate value under recommended operating conditions. Note 3:Duration short-circuit should exceed second. Note 4:Standard deviation measure statistical distribution mean derived from formula:
UNIT
UNISONIC TECHNOLOGIES CO.,
www.unisonic.com.tw
QW-R103-004,F
TL494
TEST CIRCUIT
LINEAR INTEGRATED CIRCUIT
Vcc=15V
TEST INPUTS
0.01
DEAD-TIME FEEDBACK
OUTPUT
OUTPUT
ERROR AMPLIFIER
OUTPUT CONTROL VREF OUTPUT
VOLTAGE
VOLTAGE
VOLTAGE
DEAD-TIME CONTROL INPUT
THRESHOLD VOLTAGE
THRESHOLD VOLTAGE FEEDBACK
OPERATIONAL TEST CIRCUIT WAVEFORMS
UNISONIC TECHNOLOGIES CO.,
www.unisonic.com.tw
QW-R103-004,F
TL494
TEST CIRCUIT(Cont.)
LINEAR INTEGRATED CIRCUIT
Vref
ERROR AMPLIFIER FEEDBACK TERMINAL
ERROR AMPLIFIER
AMPLIFIER CHARACTERISTICS
UNISONIC TECHNOLOGIES CO.,
www.unisonic.com.tw
QW-R103-004,F
TL494
TYPICAL PERFORMANCE CHARACTERISTICS
LINEAR INTEGRATED CIRCUIT
assumes responsibility equipment failures that result from using products values that exceed, even momentarily, rated values (such maximum ratings, operating condition ranges, other parameters) listed products specifications products described contained herein. products designed life support appliances, devices systems where malfunction these products reasonably expected result personal injury. Reproduction whole part prohibited without prior written consent copyright owner. information presented this document does form part quotation contract, believed accurate reliable changed without notice.
UNISONIC TECHNOLOGIES CO.,
www.unisonic.com.tw
QW-R103-004,F

VOLTAGE MODE CONTROL CIRCUIT TL494 incorporates functions require

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