基于LTR3741大功率20A降压电源控制方案

基于LTR3741大功率20A降压电源控制方案

Linear 公司的LTR3741是大功率恒流恒压20A降压电源控制器，输入电压VIN从6V到36V，输出电压高达VIN-2V，稳压精度1.5%,稳流精度±6%，效率高达94%，主要应用在通用工业领域，超电容充电，恒压或恒流源。本文介绍LTR3741主要特性，方框图，以及典型应用电路，包括10V/20A恒压恒流降压转换器电路图，20A超电容充电器电路图，20A LED驱动器电路图以及10A单个锂离子电池充电器电路图等。

LT3741-High Power, Constant Current, Constant Voltage, Step-Down Controller



AddiTIonal Features include an accurate external reference voltage for use with the CTRL pins, an accurate UVLO/EN pin that allows for programmable UVLO hysteresis, and thermal shutdown.

LTR3741主要特性:

Control Pin Provides Accurate Control of Regulated Output Current

1.5% Voltage RegulaTIon Accuracy

±6% Current RegulaTIon Accuracy

6V to 36V Input Voltage Range

Wide Output Voltage Range Up to (VIN – 2V)

Average Current Mode Control

<1μA Shutdown Current

Up to 94% Efficiency

AddiTIonal Pin for Thermal Control of Load Current

Thermally Enhanced 4mmx 4mm QFN and 20-Pin FE Package

LTR3741应用:

General Purpose Industrial

Super-Cap Charging

Applications Needing Extreme Short-Circuit Protection and/or Accurate Output Current Limit

Constant Current or Constant Voltage Source

图1。LTR3741方框图

图2。LTR3741 10V/20A恒压恒流降压转换器电路图


图3。LTR3741 5V稳压输出的20A超电容充电器电路图

图4。LTR3741 20A LED驱动器电路图

图5。LTR3741 10A单个锂离子电池充电器电路图