ZXLD1366

Document number: DS31992 Rev. 9 - 2

2 of 31

www.diodes.com

April 2016

© Diodes Incorporated

ZXLD1366

Block Diagram

Figure 1. Pin Connection for TSOT25 Package

Pin Description

Name

TSOT25

V-DFN3030-6

SO-8EP

Function

LX

1

1

1

Drain of NDMOS switch

GND

2

2, 5

2, 3, 6, 7

Ground (0V)

ADJ

3

3

4

Multi-function On/Off and brightness control pin:

•

•

Drive to voltage below 0.2V to turn off output current

•

•

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

Soft start time increases approximately 0.2ms/nF

4

4

5

Connect resistor RS from this pin to VIN to define nominal average output current

5

6

8

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

capacitor close to device.

Pad

-

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

dete ctor

Voltage

regulator

LX

MN

L1

D1

Adj

Gnd

50K

20K

1.25V

1.35V

0.2V

600KHz

+

-

+

-

+

-

R4

R5

R2

R3

R1

2

3

5

4

1

D1

+

-

C1

4.7µF

5V