STEVAL-TLL013V1 Datasheet, PDF (1/4 Pages) STMicroelectronics – 5-channel (2 LEDs in series per channel) step-up white LED driver demonstration board based on the STLED25

STEVAL-TLL013V1
5-channel (2 LEDs in series per channel) step-up white LED
driver demonstration board based on the STLED25
Data brief
Features
■ Operating input voltage range from 2.3 V to
5.5 V
■ ± 7.5% LED current accuracy
■ Two LEDs in series per channel
■ High-side current source
■ Up to 125 mA of total LED current
■ 86% efficiency at 100 mA
■ PWM dimming with automatic shutdown time
window
■ 2.5 MHz switching frequency
■ RoHS compliant
STEVAL-TLL013V1
Description
The STEVAL-TLL013V1 demonstration board
was designed to demonstrate the performance of
the STLED25, a fixed frequency, high-efficiency,
boost DC-DC converter with five parallel high-side
current sources.
The STLED25 is able to provide 125 mA of total
current with a maximum voltage of 7.5 V on each
channel.
Each current source supports single or dual LED
connections. The output voltage of the step-up
converter is automatically set at 100 mV above
the highest voltage required on any driver to
guarantee the proper operation of the linear
current sources. The device implements a self-
test feature to detect any failure of the LEDs and
to disable the related channel.
The failure status is reset as soon the IC is
disabled. This mode of failure detection allows the
device to continue operating driver channels that
are operating normally, while avoiding excessive
power consumption or associated thermal issues.
September 2011
Doc ID 022250 Rev 1
For further information contact your local STMicroelectronics sales office.
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