DN72 Datasheet, PDF (1/2 Pages) Zetex Semiconductors – ZXLD1101 Driving 8 series LEDs

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
V_IN
C1
C2
V_IN
LX
EN ZXLD1101 ^FB
GND
x8 LEDs
C3
R1
Figure 1 Schematic diagram
Ref.
U1
D1
L1
R1⁽¹⁾
C1
C2
C3
Value
1A
33␮H
0⍀
100␮F
1␮F
10␮F
Part number
ZXLD1101E6
ZHCS1000
Generic
Generic
Generic
Generic
Generic
Manufacturer
Zetex
Zetex
Generic
Generic
Generic
Generic
Generic
Comments
LED Driver in SOT23-6
1A Schottky in SOT23
0805 size
Table 1 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
1
© Zetex Semiconductors plc 2006
www.zetex.com