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ZXSC300
Maximum battery life solution
To ensure optimum efficiency, and therefore
maximum battery life, the LED is supplied with a
pulsed current. Maximum efficiency is ensured with
the removal of rectifier losses experienced in the
maximum brightness solution.
100
V BATT
L1
100μH
Single LED Load
U1
V cc
V drive
I sense
Gnd
ZXSC300
Q1
FMMT617
R1
0.33R
LED1
WHITE LED
95
90
85
1.0
1.5
2.0
2.5
3.0
3.5
Input Voltage (V)
Input Voltage v Efficiency
Materials list
Ref
U1
Q1
R1
L1
LED1
Value
N/A
N/A
330mW
100 H
5600mcd
Part Number
ZXSC300E5
FMMT617
Generic
DO1608P-104
NSPW500BS
Manufacture
Zetex Plc
Zetex Plc
Various
Coilcraft
Nichia
Comments
Single cell converter, SOT23-5
Low V CE(SAT) NPN, SOT23
0805 Size
Surface mount inductor
White LED
ISSUE 4 - SEPTEMBER 2007
7
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