ST ILL039V1 User Manual

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

Schematic STEVAL-ILL039V1

1 Schematic

Figure 1. Schematic

2/4 Doc ID 018912 Rev 1

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