TL494CDR TL494CN Power Path Management IC Switching Controllers PWM Controller

1 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

   

2 Applications

• Desktop PCs

• Microwave Ovens

• Power Supplies: AC/DC, Isolated, With PFC, > 90 W

• Server PSUs

• Solar Micro-Inverters

• Washing Machines: Low-End and High-End

• E-Bikes

• Power Supplies: AC/DC, Isolated, No PFC, < 90 W

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

• Smoke Detectors

• Solar Power Inverters

   

3 Description

The TL494 device 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 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-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 device 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 device is characterized for operation from 0°C to 70°C. The TL494I device is characterized for operation from –40°C to 85°C.

Device Information