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DN70

ZXSC400 Driving 2 serial high power LEDs

Description

This design note shows the ZXSC400 driving 2 serial LEDs. The input voltage ranges from 2V to

3.6V with a maximum output current of 360mA from 2.6V input.

Figure 1 shows a typical constant current solution with the ZXSC400 driving two 1W LEDs in

series. 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.

V

IN

=1.8V to 3.6V

L1

D1

Q1

U1

Vcc

Stdn

Vdrive

Isense

V

FB

C2

C1

Gnd

ZXSC400

R1

R2

Figure 1

Ref.

U1

Q1

D1

L1

R1

R2

R3

C1

C2

C3

2A

22 H

18m

820m

1K

22uF/10V

100uF/10V

220nF/10V

Value

Part number

ZXSC400E6

ZHCS2000

Generic

Generic

Generic

Generic

Generic

Generic

Generic

Table 1

Schematic diagram

Manufacturer

Zetex

Zetex

Generic

Generic

Generic

Generic

Generic

Generic

Generic

Bill of materials

0805 size

Comments

LED driver in SOT23-6

Low sat. NPN transistor in SOT23

2A Schottky in SOT23

I

SAT

= 2A

0805 size

0805 size

0805 size

ZXTN25012EFH Zetex

Issue 3 - July 2007

漏 Zetex Semiconductors plc 2007

1

www.zetex.com

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