TL494CN Datasheet

SMPS Controller


The TL494 incorporates all the functions required in the construction of a pulse-width-modulation (PWM) control circuit on a single chip. Designed primarily for power-supply control, this device 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 exhibit a common-mode voltage range from –0.3 V to VCC – 2 V. The dead-time control comparator has a fixed offset that provides 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 provide either common-emitter or emitter-follower output capability. The TL494 provides for push-pull or single-ended output operation, which can be selected through the output-control function. The architecture of this device prohibits the possibility of either output being pulsed twice during push-pull operation. The TL494C is characterized for operation from 0°C to 70°C. The TL494I is characterized for operation from –40°C to 85°C. TL494CN Features •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


[{"Name":"Maximum Supply voltage VCC ","Value":"41 V"},{"Name":"Maximum Amplifier input voltage VI","Value":"VCC + 0.3 V"},{"Name":"Maximum Collector output voltage VO","Value":"41 V"},{"Name":"Maximum Collector output voltage VO","Value":"250 mA"},{"Name":"Lead temperature 1,6 mm (1/16 inch) from case for 10 seconds","Value":"260 °C"},{"Name":"Storage Temperature TSTG","Value":"-65 to 150 °C"},{"Name":"Oscillator frequency fOSC","Value":"1 to 300 kHz"},{"Name":"","Value":""},{"Name":"","Value":""},{"Name":"","Value":""}]

Manufacturer information

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