TL494 - Switch mode Pulse Width Modulation Control Circuit

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DATA Semiconductor Components Industries, LLC, 2005August, 2021 Rev. 71Publication Order Number: TL494 /DSwitch mode Pulse WidthModulation Control CircuitTL494, NCV494The TL494 is a fixed frequency, Pulse Width Modulation controlcircuit designed primarily for Switch mode power supply Complete Pulse Width Modulation Control Circuitry On Chip Oscillator with Master or Slave Operation On Chip Error Amplifiers On Chip V Reference Adjustable Deadtime Control Uncommitted Output Transistors Rated to 500 mA Source or Sink Output Control for Push Pull or Single Ended Operation Undervoltage Lockout NCV Prefix for Automotive and Other Applications Requiring Siteand Control Changes Pb Free Packages are Available*MAXIMUM RATINGS (Full operating ambient temperature range applies,unless otherwise noted.)RatingSymbolValueUnitPower Supply VoltageVCC42VCollector Output VoltageVC1,VC242VCollector Output Current(Each transistor) (Note 1)IC1, IC2500mAAmplifier Input Voltage RangeVIR to +42VPower Dissipation @ TA 45 CPD1000mWThermal Resistance, Junction to AmbientRqJA80 C/WOperating Junction TemperatureTJ125 CStorage Temperature RangeTstg 55 to +125 COperating Ambient Temperature RangeTL494BTL494CTL494INCV494BTA 40 to +1250 to +70 40 to +85 40 to +125 CDerating Ambient TemperatureTA45 CStress

The TL494 is a fixed−frequency pulse width modulation control circuit, incorporating the primary building blocks required for the control of a switching power supply. (See Figure 1.) An internal−linear sawtooth oscillator is frequency− programmable by two external components, RT and CT. The approximate oscillator frequency is determined by:

  Control, Pulse, Circuit, Modulation, Width, Pulse width modulation control circuits