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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

V

IN

D1

C1

V

IN

LX

x8 LEDs

C3

FB

C2

EN

ZXLD1101

GND

R1

Figure 1

Ref.

U1

D1

L1

R1

(1)

C1

C2

C3

1A

33 H

0

100 F

1 F

10 F

Value

Part number

ZXLD1101E6

ZHCS1000

Generic

Generic

Generic

Generic

Generic

Table 1

Schematic diagram

Manufacturer

Zetex

Zetex

Generic

Generic

Generic

Generic

Generic

Bill of materials

0805 size

Comments

LED Driver in SOT23-6

1A Schottky in SOT23

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

漏 Zetex Semiconductors plc 2006

1

www.zetex.com

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