Linear LT3748 150度C开关稳压器控制方案

Linear 公司的LT3748是可工作在150度C结温的开关稳压器控制器,适用于大功率隔离性反激拓扑. LT3748能从内部的7V电源驱动外接的N沟功率MOSFET,不需要第三个绕组或光耦合器,就可实现绝缘的输出.输入电压5V-100V,平均栅极驱动电流和沉电流为1.9A,主要用在隔离的通信转换器,大功率汽车电源和隔离的工业电源.本文介绍了LT3748主要特性, 方框图以及多种应用电路.

The LT3748 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

Boundary Mode Operation
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