Issue 2 - July 2006 1 www.zetex.com
© Zetex Semiconductors plc 2006
DN72
ZXLD1101 Driving 8 series LEDs
Description
This design note shows the ZXLD1101 driving 8 series connected LEDs. The input voltage ranges
from 4.2V to 5.2V with a maximum output current of 24mA at 5V input.
A typical schematic diagram is shown in Figure 1.
Figure 1 Schematic diagram
Ref. Value Part number Manufacturer Comments
U1 ZXLD1101E6 Zetex LED Driver in SOT23-6
D1 1A ZHCS1000 Zetex 1A Schottky in SOT23
L1 33H Generic Generic
R1
(1)
NOTES:
(1) R1 is set to zero. It shows the maximum output power characteristic of the LED driver. A regulated LED
current below the maximum value can be set by: I
LED
= V
FB
/R1, where V
FB
= 0.1V.
0⍀ Generic Generic 0805 size
C1 100F Generic Generic
C2 1F Generic Generic
C3 10F Generic Generic
Table 1 Bill of materials
L1
D1
R1
C3
EN
GND
FB
LX
V
IN
ZXLD1101
x8 LEDs
C2
C1
V
IN
