TL594中文资料PWM 控制器数据手册ONSEMI规格书

描述 Description

The TL594 PWM Controller 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 systems engineer the flexibility to tailor the power-supply control circuitry to a specific application.The TL594 PWM Controller contains two error amplifiers, an on-chip adjustable oscillator, a dead-time control (DTC) comparator, a pulse-steering control flip-flop, a 5-V regulator with a precision of 1.5%, an undervoltage lockout control circuit, and output control circuitry.The error amplifiers have a common-mode voltage range of -0.3 V to VCC-2 V. The DTC 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 be used to drive the common circuitry in synchronous multiple-rail power supplies.The uncommitted output transistors provide either common-emitter or emitter-follower output capability. Each device provides for push-pull or single-ended output operation, with selection by means of the output-control function. The architecture of these devices prohibits the possibility of either output being pulsed twice during push-pull operation. The undervoltage lockout control circuit locks the outputs off until the internal circuitry is operational.The TL594CD, CN, CDTB are characterized for operation from -40C to 85C.

特性 Features

• PWM Buck Controller Configuration
• Simple to use in buck configuration
• Variable Frequency Operation (up to 300 KHz)
• Optimize system size and efficiency
• Complete Pulse Width Modulation Control Circuitry
• On-Chip Oscillator with Master or Slave Operation
• On-Chip Error Amplifiers
• On-Chip 5.0 V Reference, 1.5% Accuracy
• Adjustable Deadtime Control
• Uncommitted Output Transistors Rated to 500 mA Source or Sink
• Output Control for Push-Pull or Single-Ended Operation
• Undervoltage Lockout
• Pb-Free Packages are Available

应用 Application

• Off-line power supply
• Buck converter
• VPA (Vehicle Power Adapter)
• LED Lighting

简介

TL594属于集成电路（IC）的DC-DC开关控制器。由制造生产的TL594DC-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。