AN2050 3相辅助电源设计的基础上发射开关双极晶体管（ESBTs）

AN2050 3相辅助电源设计的基础上发射开关双极晶体管（ESBTs）

AN2050
APPLICATION NOTE
3-PHASE AUXILIARY POWER SUPPLY DESIGN BASED ON
EMITTER SWITCHED BIPOLAR TRANSISTORS (ESBTS)

1. INTRODUCTION

This document presents the results of a 3-Phase auxiliary power supply designed with the UC3845 PWM
driver and an ESBT, the new STC03DE170, as main switch. This work is supplemented by the release
of a 45W dual output SMPS demo board, widely used as auxiliary power supply in 3-phase motor drive
applications.
Moreover, the ESBT base driving circuit and some guidelines for the optimization of the power
dissipation are given. The influence of parasitic capacitance on ESBTs is also described in detai