Description:

 The TL494 device incorporates all the functionsrequired in the construction of a pulse-widthmodulation (PWM) control circuit on a single chip.Designed primarily for power-supply control, thisdevice offers the flexibility to tailor the power-supplycontrol circuitry to a specific application.

The TL494 device 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-controlcircuits.The error amplifiers exhibit a common-mode voltagerange from –0.3 V to VCC – 2 V. The dead-timecontrol comparator has a fixed offset that providesapproximately 5% dead time. The on-chip oscillatorcan be bypassed by terminating RT to the referenceoutput and providing a sawtooth input to CT, or it candrive the common circuits in synchronous multiple-railpower supplies.The uncommitted output transistors provide eithercommon-emitter or emitter-follower output capability.The TL494 device provides for push-pull or singleended output operation, which can be selectedthrough the output-control function. The architectureof this device prohibits the possibility of either outputbeing pulsed twice during push-pull operation.The TL494 device is characterized for operation from0°C to 70°C. The TL494I device is characterized foroperation from –40°C to 85°C.

Features:

• Complete PWM Power-Control Circuitry

• Uncommitted Outputs for 200-mA Sink orSource Current

• Output Control Selects Single-Ended orPush-Pull Operation

• Internal Circuitry Prohibits Double Pulse atEither Output

• Variable Dead Time Provides Control OverTotal Range

• Internal Regulator Provides a Stable 5-VReference Supply With 5% Tolerance

• Circuit Architecture Allows Easy Synchronization

 Applications:

• Desktop PCs

• Microwave Ovens

• Power Supplies: AC/DC, Isolated, With or WithoutPFC

• Server PSUs

• Solar Micro-Inverters

• Washing Machines: Low-End and High-End

• E-Bikes

• Power: Telecom/Server AC/DC Supplies:Dual Controller: Analog

• Smoke Detectors

• Solar Power Inverters