TL494 - 脉冲宽度调制 (Pwm) 控制电路

TL494是TI德州仪器公司的一款PWM与谐振控制器产品，TL494是脉冲宽度调制 (Pwm) 控制电路，本站介绍了TL494的封装应用图解、特点和优点、功能等，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 - 德州仪器

产品特性

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

产品应用

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

产品说明

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.

产品器件信息

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

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