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 or Without

PFC

• 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

3 Description

The TL494 device incorporates all the functions

required in the construction of a pulse-widthmodulation

(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 singleended

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 TL494 device is characterized for operation from

0°C to 70°C. The TL494I device is characterized for

operation from –40°C to 85°C.

TL494C属于集成电路（IC） > DC-DC 开关控制器。美国德州仪器公司制造生产的TL494CDC-DC 开关控制器PMIC（电源管理集成电路）DC 到 DC 开关式控制器是用于高效率电路的稳压 IC，其配置为生成高于（突升或步升）或低于（突降或步降）输入电源的输出电源电压。其他拓扑结构可能包括：降压-升压、反激、正激、Cuk、SEPIC、全桥、半桥和推挽式。这些器件不同于需要最小电压并“烧尽”多余电压的线性稳压器。