TL494是TI公司的一款PWM与谐振控制器产品，TL494是脉冲宽度调制 (Pwm) 控制电路，本页介绍了TL494的产品说明、应用、特性等，并给出了与TL494相关的TI元器件型号供参考。
TL494 - 脉冲宽度调制 (Pwm) 控制电路 - PWM与谐振控制器 - 离线隔离型DC/DC控制器和转换器 - TI公司（Texas Instruments，德州仪器）
- 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
- 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
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.
| PART NUMBER | PACKAGE (PIN) | BODY SIZE |
|---|---|---|
| TL494 | SOIC (16) | 9.90 mm × 3.91 mm |
| PDIP (16) | 19.30 mm × 6.35 mm | |
| SOP (16) | 10.30 mm × 5.30 mm | |
| TSSOP (16) | 5.00 mm × 4.40 mm |
