March 2010

Doc ID 15599 Rev 1

1/31

AN2982

Application note

1 x 54 W T5 fluorescent lamp ballast in wide input voltage range

using the L6585DE - STEVAL-ILB005V2

Introduction

This application note describes the STEVAL-ILB005V2 demonstration board equipped with

the L6585DE lighting controller, STD7NM50N MOSFETs and an STTH1L06 Shottky diode

able to drive a 54 W linear T5 fluorescent lamp in a wide input voltage range (88 - 277 Vac).

The design steps, schematic and board performance are also given.

The L6585DE lighting controller embeds both the PFC stage and ballast stage suitable for

driving all kinds of lamps (T8, T5, T4, CFLn,...) and all kinds of topologies having an input

power greater than 25 W.

New T5 lamps are characterized by very high luminous efficiency and compactness. To

optimize their performance, high accuracy in both preheating of the cathodes and steady-

state parameters is required. The minimum performance of T5 ballasts together with their

minimum safety requirements are summarized in international norms, especially IEC61347-

2-3, IEC60929, and IEC60081.

The demand for these lamps is rapidly growing and the L6585DE is able to control electronic

ballasts meeting all performance specifications and reliability with low component count and

a small PCB.

The STEVAL-ILB005V2 has been developed to drive a 54 W T5-HO lamp.

Figure 1.

STEVAL-ILB005V2 demonstration board

www.st.com