Data brief
For further information contact your local STMicroelectronics sales office.
December 2009 Doc ID 16766 Rev 2 1/4
4
STEVAL-ILL026V1
3 W non-isolated offline LED driver
demonstration board based on the VIPer22A-E
Features
■ Input voltage: 90 to 265 V
RMS
■
Provides 350 mA constant current for LEDs
■ Capable of driving 3 x 1 W LEDs in series with
high-precision constant current (± 5%
tolerance)
■ Overtemperature protection
■ LED open circuit protection
■ LED short-circuit protection
■ 230 V
AC
input version with no electrolytic
capacitor
■ EN55015 & EN6100-3-2 compliant
■ RoHS compliant
Description
The progress made in the field of LEDs is visible
on an almost day-by-day basis. Many high power
LEDs are currently on the market, such as 0.7 A
and 1 A devices. However, the most commonly
used LEDs are those with a current of 0.350 A.
This demonstration board is designed for 350 mA
LEDs and is capable of driving three 1 W LEDs in
series with high-precision constant current (± 5%
tolerance). The design is based on the VIPer22A-
E, which combines a dedicated current mode
PWM controller with a high voltage power
MOSFET on the same silicon chip.
The internal control circuit offers a large input
voltage range on the V
DD
pin, accommodates
changes in auxiliary supply voltage, and supports
automatic burst mode in low load conditions. The
board also features protections against
overtemperature, overcurrent and overvoltage
conditions.
STEVAL-ILL026V1
www.st.com
