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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
!-V
www.st.com
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