STEVAL-TLL001V1 Datasheet, PDF (1/4 Pages) STMicroelectronics – White LED controller evaluation board based on the STLD40D

STEVAL-TLL001V1
White LED controller evaluation board based on the STLD40D
Data Brief
Features
■ Inductor switches boost controller
■ PFM mode control
■ High efficiency over wide range of input voltage
from 3.0 V to 5.5 V
■ Over-voltage protection with automatic restart
■ Adjustable peak current limit
■ Enable pin with possibility of PWM dimming
control
■ Low shutdown current <1 µA
Description
This evaluation board is based on the STLD40D
that is a boost converter that operates from 3.0 V
to 5.5 V and can provide an output voltage as 37 V
and can drive up to 10 white LEDs in series. The
converter is a PFM (pulse frequency modulation)
inductor switches and can work in discontinuous
(DCM) mode operation. A minimum OFF time of
the embedded boost switch TSW is fixed
internally and allows limiting the switching
frequency. The output current capability is 20 mA
with an output voltage of 37 V. The regulation is
done by sensing the led current through the
resistor R_LED. The device can be turned ON/OFF
through the logic enable signal pin EN. Applying a
low frequency PWM signal the LEDs can be
dimmed. The maximum peak inductor current can
be programmed.
STEVAL-TLL001V1
October 2008
Rev 1
For further information contact your local STMicroelectronics sales office.
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