Data brief

For further information contact your local STMicroelectronics sales office.

September 2011

Doc ID 022250 Rev 1

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STEVAL-TLL013V1

5-channel (2 LEDs in series per channel) step-up white LED

driver demonstration board based on the STLED25

Features

5.5 V

window

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.

STEVAL-TLL013V1

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