AN3372 Datasheet, PDF (1/37 Pages) STMicroelectronics – This note describes digital ballast for 70 W HID lamps

AN3372
Application note
STEVAL-ILH004V1: 70 W HID digital ballast
By Sebastiano Messina
Introduction
This note describes digital ballast for 70 W HID lamps (sodium or metal halide) used in
general lighting applications. The ballast is composed of a boost converter (power factor
controller PFC) working in transition mode and an inverter composed of a half bridge that
drives the lamp in low frequency square wave.
Both the half bridge and the PFC stage are managed by the ST7LITE49K2 that controls the
L6382D5, activating all the power switches.
The tests have been conduced using a 70 W metal halide lamp. With test results some
design criteria are given.
Figure 1. STEVAL-ILH004V1 image
January 2013
Doc ID 018625 Rev 1
1/37
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