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Step-up current controller for 2 LEDs
Features
■ Input voltage: 0.8 V to 3.6 V
■ Output : 2 LEDs at I
■ Dimming mode with external PWM signal
■ RoHS compliant
Description
The purpose of the STEVAL-ILL039V1
demonstration board is to provide an example for
applications of an LED driver using the step-up
controller STLDC08.
The STLDC08 is designed for handheld
equipment supplied by AA or AAA batteries and
provides a precise constant current starting from
a variable input voltage source.
= 200 mA
LED
STEVAL-ILL039V1
based on the STLDC08 driver
Data brief
STEVAL-ILL039V1
The LED current is set by an external sense
resistor inserted between the feedback pin (FB)
and GND.
A regulation loop holds the voltage drop at the
sense resistor at a constant level (100 mV typ.).
October 2011 Doc ID 018912 Rev 1 1/4
For further information contact your local STMicroelectronics sales office.
www.st.com
4
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Schematic STEVAL-ILL039V1
1 Schematic
Figure 1. Schematic
2/4 Doc ID 018912 Rev 1
!-V