AN1889 datasheet(1/33 Pages) STMICROELECTRONICS

Il numero della parte	AN1889

Spiegazioni elettronici	The need to choose a high value of the fly-back voltage

PDF	33 Pages

Scroll/Zoom	100%

Produttore elettronici	STMICROELECTRONICS [STMicroelectronics]

Homepage	http://www.st.com

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1 / 33 page

August 2007

Rev 3

1/33

AN1889

Application note

ESBT

STC03DE170HV in 3-phase auxiliary power supply

Introduction

The need to choose a high value of the fly-back voltage is well known to power supply

designers when efficiency and high duty cycle become important requirements. Three-

phase auxiliary power supplies, starting from a bulk voltage of 750 V, require theoretically

power transistors with a block voltage capability higher than 1200 V. Practical considerations

linked to better efficiency and safe margin may impose to choose devices with even higher

breakdown voltage (i.e. 1500 V, 1700 V). Looking at the power switches currently available,

while power bipolar transistors are strongly limited in switching frequency operation, Power

MOSFETs show a much lower current capability, which may limit their use to low power

applications. Recently available in the market, the ESBTs (Emitter Switched Bipolar

Transistors) represent a valuable and cost effective alternative for all those applications

where high voltage and high switching frequencies are a must.

This application note describes the realization of a 50 W 3-phase auxiliary power supply by

using the STC03DE170HV as main switch for the fly-back converter. Particular attention has

been given to the transformer design as well as to the ESBT driving circuit requirements.

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