ST TLL002V1 User Manual

Flash driver evaluation board based on the STCF01

Features

■ For camera flash in cellular phones

■ PWM mode control

■ High efficiency over wide range of input voltage

from 2.6 V to 5.5 V

■ Output voltage: 16.5 V

■ High switching frequency: 1.5 MHz

Description

This evaluation board is based on the STCF01,
that is a white LED driver optimized for driving two
to four LEDs from a Li-Ion battery input.

It provides up to 300 mA over an input voltage
range of 2.6 V to 5.5 V and it features 16.5 V
output voltage, 1.5 MHz internal power switch,
internal soft start, open load voltage protection
and optimized internal compensation.

STEVAL-TLL002V1

Data Brief

Only an inductor, a Schottky diode, two capacitors
and two resistors are required. Besides, a low
output ripple is guaranteed by the current mode
PWM topology and by the use of low E.S.R. SMD
ceramic capacitors

The STCF01 is ideal for camera flash in cellular
phones requiring, small circuit size and very high
efficiency (up to 90%).

STEVAL-TLL002V1

October 2008 Rev 1 1/4

For further information contact your local STMicroelectronics sales office.

www.st.com

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Board schematic STEVAL-TLL002V1

1 Board schematic

Figure 1. Typical application schematic

Suggested Values:

RLC=12kΩ
RHC=4kΩ

C1=2.2µF
C2=4.7µF
L1=10µH

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