ST TLL003V1 User Manual

STEVAL-TLL003V1

Power flash LED driver evaluation board based on the STCF02

Features

■ Flash LED driver based on the STCF02 high-

power white LED driver

■ A High operating frequency: 1.8 MHz

■ The device can operate in five modes which

are selected using a combination of logic
signals (connected to three enable pins) Five
selectable operating modes:

– Shutdown mode: quiescent current less

than 1µA (typical)

– Shutdown mode with activated negative

temperature coefficient (NTC) LED
temperature sensing, useful for measuring
the temperature before starting both torch

and flash modes
– Torch mode: drives the LED up to 250 mA
– Flash mode: drives the LED up to 600 mA
– Middle flash mode: the current is set

between the torch and the flash mode

levels

STEVAL-TLL003V1

Data Brief

Description

This evaluation board is dedicated to the design of
a flash LED driver using the STCF02 step-up/
down current mode converter, providing the
proper recommendations for PCB layout and
external components. The device can operate in
five modes which are selected using a
combination of logic signals (connected to three
enable pins). Also implemented is a simple
programmable RC circuit used to shut down the
device to prevent LED burning during flash mode
in the event of microcontroller fault. This
evaluation board drives a single flash LED with a
forward voltage range of 2.7 to 5 V.

December 2007 Rev 1 1/4

For further information contact your local STMicroelectronics sales office.

www.st.com

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Board schematic STEVAL-TLL003V1

1 Board schematic

Figure 1. Schematic

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