AN2747 datasheet(1/44 Pages) STMICROELECTRONICS

Part #	AN2747

Description	250 W HID metal halide electronic ballast

PDF	44 Pages

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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1 / 44 page

May 2008

Rev 1

1/44

AN2747

Application note

250 W HID metal halide electronic ballast

Introduction

This application note describes the two stages of electronic ballast for a 250 W HID metal

halide lamp. The ballast is composed of a boost converter (power factor controller PFC)

working in fixed OFF time and an inverter composed of a full bridge that drives the lamp at

low frequency square wave.

This design was realized thanks to the very large STMicroelectronics product portfolio. The

components include a PFC driver, half-bridge drivers, a microcontroller, an auxiliary power

supply, a voltage reference, logic parts, an amplifier, comparators, power devices as Power

MOSFETs, IGBTs, and fast diodes.

In the present note special attention has been given to the full bridge stage. The tests have

been conducted using a 250 W metal halide lamp HQI - T (OSRAM) and some design

criteria are given with test results. In the full bridge section all lamp phases have been

analyzed.

Figure 1.

STEVAL-ILH001V1

www.st.com

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