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DN68

ZXSC310 High power torch reference design

Description

This design note shows a typical ZXSC310 LED driver circuit for a high powered LED torch. The

input voltage ranges from 0.7V to 1.6V with a maximum output current of 335mA at 1.4V input.

A typical schematic diagram is shown in Figure 1.

D1

V

IN

U1

Vcc

L1

Q1

Vdrive

C1

Stdn

Isense

Gnd

C2

C3

ZXSC310

R1

Figure 1

Reference Value

U1

Q1

D1

L1

R1

C1

C2

C3

2A

7.5 H

19.5m

1 F

220 F

100 F

Part number

ZXSC310E5

FMMT617

ZHCS2000

Schematic diagram

Comments

LED driver in SOT23-5

Low sat. NPN in SOT23

2A Schottky in SOT23

Manufacturer Contact details

Zetex

Zetex

Zetex

www.zetex.com

www.zetex.com

www.zetex.com

DO3316P-153x2 Coilcraft

Generic

Generic

Generic

Generic

Generic

Generic

Generic

Generic

Table 1

www.coilcraft.com I

SAT

= 3A

NA

NA

NA

NA

0805 size

Bill of materials

Issue 2 - July 2006

漏 Zetex Semiconductors plc 2006

1

www.zetex.com

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