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TL494 Pulsewidth Mod Controller CCT

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$2.24 (inc GST) $2.04 (exc GST)
Ships in 7 to 10 bus. days

Product Description

TL494 Pulsewidth Modulation Controller 

The TL494 possesses all of the functions required to construct a pulse-width-modulation (PWM) control 
circuit on a single chip. Designed from the outset for power-supply control, this chip offers the flexibility to tailor the 
power-supply control circuitry to a specific application. 
The TL494 contains two error amplifiers, an on-chip adjustable oscillator, a dead-time control (DTC) comparator, 
a pulse-steering control flip-flop, a 5-V, 5%-precision regulator, and output-control circuits. 
The error amplifiers display a common-mode voltage range from –0.3 V to VCC – 2 V. The dead-time control 
comparator has a fixed offset that gives approximately 5% dead time. The on-chip oscillator can be bypassed 
by terminating RT to the reference output and providing a sawtooth input to CT, or it can drive the common 
circuits in synchronous multiple-rail power supplies. 
The uncommitted output transistors allow for either common-emitter or emitter-follower output capability. The 
TL494 provides for push-pull or single-ended output operation, which can be chosen through the output-control 
function. The architecture of this device alleviates the possibility of either output being pulsed twice during 
push-pull operation.


  • Complete PWM Power-Control Circuitry
  • Uncommitted Outputs for 200-mA Sink or Source Current
  • Output Control Selects Single-Ended or Push-Pull Operation
  • Internal Circuitry Prohibits Double Pulse at Either Output
  • Variable Dead Time Provides Control Over Total Range
  • Internal Regulator Provides a Stable 5-V Reference Supply With 5% Tolerance
  • Circuit Architecture Allows Easy Synchronization

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