Zxsc300, Input voltage v efficiency, Efficiency (%) – Diodes ZXSC300 User Manual
Page 7: Led1, Materials list
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ZXSC300
ISSUE 4 - SEPTEMBER 2007
7
Ref
Value
Part Number
Manufacture
Comments
U1
N/A
ZXSC300E5
Zetex Plc
Single cell converter, SOT23-5
Q1
N/A
FMMT617
Zetex Plc
Low V
CE(SAT)
NPN, SOT23
R1
330mW
Generic
Various
0805 Size
L1
100
H
DO1608P-104
Coilcraft
Surface mount inductor
LED1
5600mcd
NSPW500BS
Nichia
White LED
1.0
1.5
2.0
2.5
3.0
3.5
85
90
95
100
Input Voltage v Efficiency
Single LED Load
Efficiency (%)
Input Voltage (V)
Q1
FMMT617
R1
0.33R
L1
100µH
V
BATT
LED1
WHITE LED
V
cc
Gnd
I
sense
V
drive
U1
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.
Materials list
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