Diodes ZXSC300 - Manual (Page 7)

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