ST TLL002V1 User Manual

Flash driver evaluation board based on the STCF01
Features
For camera flash in cellular phones
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
4
Board schematic STEVAL-TLL002V1

1 Board schematic

Figure 1. Typical application schematic

Suggested Values:
RLC=12k RHC=4k
C1=2.2µF C2=4.7µF L1=10µH
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