Diodes ZXSC410/ZXSC420/ZXSC440 - Manual (Page 13)

ZXSC410/ZXSC420/ZXSC440
Document number: DS33618 Rev. 5 - 2
13 of 17
www.diodes.com
March 2013
© Diodes Incorporated
ZXSC410/ZXSC420/ZXSC440
Application Examples
(cont.)
Battery Powered Two 1W LED Lamp
This application shows the ZXSC410/420/440 driving 2 serial LEDs. The input voltage ranges from 2V to 3.6V with a maximum output current of
360mA from 2.6V input.
The wide input voltage range allows the use of different battery cell combinations. This could be dual alkaline cells with voltage starting from 3V
down to 2V or triple NiCad/NiMH cells with voltage starting from 3.6V down to 2.7V.
2.8 2.6 2.4 2.2 2.0 3.6 3.4 3.2 3.0
INPUT VOLTAGE (V)
Efficiency vs. Input Voltage
100
90
60
50
80
70
E
F
F
IC
IE
N
C
Y
(%
)
0.4
0.0
0.2
O
U
T
P
U
T
C
U
R
R
EN
T
(A
)
2.8 2.6 2.4 2.2 2.0 3.6 3.4 3.2 3.0
INPUT VOLTAGE (V)
LED Current vs. Input Voltage
ZXSC410
ZXTN25012EFH
ZHCS2000
22µH
18mΩ 820m Ω
22µF
100µF