Linear LT3748绝缘反激拓扑开关电源控制方案

Linear 公司的LT3748是开关电源控制器，特别设计用于绝缘反激拓扑和大功率开关电源。输入电压5V-100V，平均栅极驱动源电流和沉电流1.9A，能驱动低边外接功率MOSFET，不需要第三个绕组或光隔离器，并具有可编的软起动，主要用于绝缘的通信转换器，大功率汽车电源和绝缘工业电源。本文介绍了LT3748主要特性，方框图以及25W/12V通信电源，汽车IGBT控制电源，±300V 绝缘反激转换器和输入24-96V输出48V/0.5A 电源。

The LT®3748 is a switching regulator controller specifically designed for the isolated flyback topology and capable of high power. It drives a low side external N-channel power MOSFET from an internally regulated 7V supply. No third winding or opto-isolator is required for regulation as the part senses the isolated output voltage directly from the primary-side flyback waveform.

The LT3748 utilizes boundary mode to provide a small magnetic solution without compromising load regulation. Operating frequency is set by load current and transformer magnetizing inductance. The gate drive of the LT3748 combined with a suitable external MOSFET allow it to deliver load power up to several tens of watts from input voltages as high as 100V.

The LT3748 is available in a high voltage 16-lead MSOP package with four leads removed.

LT3748主要特性：

5V to 100V Input Voltage Range

1.9A Average Gate Drive Source and Sink Current
..

查看全文