基于LT3748的絕緣反激拓?fù)溟_(kāi)關(guān)電源控制技術(shù)介紹

本文介紹了LT3748主要特性，方框圖以及25W/12V通信電源，汽車(chē)IGBT控制電源，±300V 絕緣反激轉(zhuǎn)換器和輸入24-96V輸出48V/0.5A 電源。Linear 公司的LT3748是開(kāi)關(guān)電源控制器，特別設(shè)計(jì)用于絕緣反激開(kāi)關(guān)電源。輸入電壓5V-100V，平均柵極驅(qū)動(dòng)源電流和沉電流1.9A，能驅(qū)動(dòng)低邊外接功率MOSFET，不需要第三個(gè)繞組或光隔離器，并具有可編的軟起動(dòng)，主要用于絕緣的通信轉(zhuǎn)換器，大功率汽車(chē)電源和絕緣工業(yè)電源。


LT3748主要特性：

5V to 100V Input Voltage Range

1.9A Average Gate Drive Source and Sink Current

Boundary Mode Operation

No Transformer Third Winding or Opto-Isolator Required for Regulation

Primary-Side Winding Feedback Load Regulation

VOUT Set with Two External Resistors

INTVCC Pin for Control of Gate Driver Voltage

Programmable Soft Start

Programmable Undervoltage Lockout

Available in MSOP Package

LT3748應(yīng)用：

Isolated Telecom Converters

High Power Automotive Supplies

Isolated Industrial Power Supplies

圖1。LT3748方框圖

圖2。LT3748 25W/12V通信電源框圖