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ZXSC300
REFERENCE DESIGNS
Two typical LED driving applications are shown.
Firstly a maximum brightness solution and
secondly an optimised battery life solution.
Maximum brightness solution
This circuit provides a constant current output to
the LED by rectifying the switching pulses. This
ensures maximum LED brightness.
VBATT
L1
100μH
D1
U1
V cc
V drive
I sense
ZHCS1000
Q1
FMMT617
C1
2.2μF
LED1
WHITE LED
Gnd
ZXSC300
R1
0.1R
Material List
Ref
U1
Q1
D1
R1
C1
L1
LED1
Value
N/A
N/A
1A
100mR
2.2 F
100μH
5600mcd
Part Number
ZXSC300E5
FMMT617
ZHCS1000
Generic
Generic
DO1608P-104
NSPW500BS
Manufacture
Zetex Plc
Zetex Plc
Zetex Plc
Various
Various
Coilcraft
Nichia
Comments
Single cell converter, SOT23-5
Low V CE(sat) NPN, SOT23
1A Shottky diode, SOT23
0805 Size
Low ESR ceramic capacitor
Surface mount inductor
White LED
ISSUE 4 - SEPTEMBER 2007
6
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