DN72

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.
L1
D1
VIN
C1
x8 LEDs
C2
VIN
LX
EN
ZXLD1101
C3
FB
GND
Figure 1
Ref.
Value
U1
R1
Schematic diagram
Part number
Manufacturer
Comments
ZXLD1101E6
Zetex
LED Driver in SOT23-6
1A Schottky in SOT23
D1
1A
ZHCS1000
Zetex
L1
33␮H
Generic
Generic
R1(1)
0⍀
Generic
Generic
C1
100␮F
Generic
Generic
C2
1␮F
Generic
Generic
C3
10␮F
Generic
Generic
Table 1
0805 size
Bill of materials
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: ILED = VFB/R1, where VFB = 0.1V.
Issue 2 - July 2006
© Zetex Semiconductors plc 2006
1
www.zetex.com
DN72
Typical operating characteristics
(For typical application circuit where Tamb = 25°C unless otherwise stated)
Figure 2
Performance graphs
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Issue 2 - July 2006
© Zetex Semiconductors plc 2006
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