Linear LT8582故障保护双路PWM DC电源解决方案

2012年02月01日 12:38 发布者：1770309616

Linear公司的LT8582是带故障保护的双路独立的PWM DC/DC转换器,每路包括42V主开关和42V从开关,并联使用的总电流为3A,具有过压,超温以及输出短路保护.工作电压2.5V-22V,开关频率高达2.5MHz,每路可容易配置成升压,SEPIC,反向或反激转换器,主要用在本地电源,VFD偏压电源,TFT-LCD偏压电源和汽车引擎控制单元(ECU)电源.本文介绍了LT8582主要特性,方框图,基本应用电路以及多种典型应用电路与两种拓扑的元件布局图.

The LT8582 is a dual independent channel PWM DC/DC converter with a power good pin and built-in fault protection to help guard against input overvoltage and overtemperature conditions. Each channel consists of a 42V master switch and a 42V slave switch that can be tied together for a total current limit of 3A.

The LT8582 is ideal for many local power supply designs. Each channel can be easily configured in boost, SEPIC, inverting, or flyback configurations. Together, the two channels can produce a 12V and a –12V output with 14.4W of combined output power from a 5V input. In addition, the LT8582’s slave switch allows the part to be configured in high voltage, high power charge pump topologies that are more efficient and require fewer components than traditional circuits.

The LT8582 also features innovative SHDN pin circuitry that allows for slowly varying input signals and an adjustable undervoltage lockout function. Additional features such as output short protection, frequency foldback and soft-start are integrated. The LT8582 is available in a 24-pin 7mmx 4mm DFN package.

LT8582主要特性:

Dual 42V, 3A Combined Power Switch

Master/Slave (1.7A/1.3A) Switch Design

Wide Input Range: 2.5V to 22V Operating, 40V Maximum Transient

Power Good Pin for Event Based Sequencing

Switching Frequency Up to 2.5MHz

Each Channel Easily Configurable as a Boost, SEPIC, Inverting or Flyback Converter

Low VCESAT Switch: 270mV at 2.75A (Typical)

Can be Synchronized to an External Clock

Output Short-Circuit Protection

High Gain SHDN Pin Accepts Slowly Varying Input Signals

24-Pin 7mmx 4mm DFN Package

LT8582应用:

Local Power Supply

Vacuum Fluorescent Display (VFD) Bias Supplies

TFT-LCD Bias Supplies

Automotive Engine Control Unit (ECU) Power