ZXLD1356

ZXLD1356

Document number: DS33470 Rev. 3 - 2

2 of 29

www.diodes.com

December 2010

© Diodes Incorporated

A Product Line of

Diodes Incorporated

Block Diagram

Figure 1. Block diagram – Pin connections shown for TSOT23-5 package

Name

TSOT23-5

DFN3030-6

Description

LX

1

1

Drain of NDMOS switch

GND

2

2, 5

Ground (0V)

ADJ

3

3

Multi-function On/Off and brightness control pin:

•

output current

o

•

Drive to voltage below 0.2V to turn off output current

•

•

Connect a capacitor from this pin to ground to define soft-start time.

Soft-start time is approx.0.2ms/nF

4

4

5

6

Input voltage (6V to 60V). Decouple to ground with 4.7µF of higher X7R ceramic capacitor

close to device

Pad

-

Pad

Exposed pad (EP) - connected to device substrate.

To improve thermal impedance of package the EP must be connected to power ground

but should not be used as the 0V (GND) current path.

It can be left floating but must not be connected to any other voltage other than 0V.

Low voltage

detector

Voltage

regulator

LX

MN

L1

D1

Adj

Gnd

50K

20K

1.25V

1.35V

0.2V

600KHz

+

-

+

-

+

-

R4

R5

R2

R3

R1

2

3

54

1

D1

+

-

C1

4.7

μF

5V