1. Description

The SD4945 is a DC-DC controller with a built-in 150V high-voltage MOSFET for switching power supplies.

The SD4945 features built-in high-voltage startup and self-powering capabilities, meeting the requirements for fast startup and low standby power consumption. It has an adaptive frequency reduction function to further optimize conversion efficiency under light load conditions. It also features soft-start functionality to reduce device stress and effectively prevent inductor saturation during startup. The SD4945 integrates various abnormal state protection functions, including: VDD undervoltage protection, output overload protection, output overvoltage protection, and overtemperature protection. After protection is triggered, the circuit will automatically restart continuously until the system is operating normally.