AN2961 Datasheet, PDF (1/14 Pages) STMicroelectronics – STEVAL-ILL026V1 non-isolated 3 W offline LED driver based on the VIPER22A-E

AN2961
Application note
STEVAL-ILL026V1 non-isolated 3 W offline
LED driver based on the VIPER22A-E
Introduction
This application note describes the functioning of the STEVAL-ILL026V1 non-isolated 3 W
offline LED driver power supply designed using the VIPER22A-E low power offline SMPS
primary switcher from STMicroelectronics. The circuit regulates the load current to 350 mA
and generates about 10 V. The load is composed of three high-brightness (HB) LEDs,
connected in series.
The project does not provide safety isolation between the input and output.
This document provides the power supply specification, circuit diagrams, the complete bill of
materials, and reports the results of circuit testing.
Figure 1. STEVAL-ILL026V1 board photographs
November 2009
Doc ID 15559 Rev 1
!-V
1/14
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