ZXLD1366 datasheet(2/30 Pages) DIODES

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ZXLD1366

Document number: DS31992 Rev. 9 - 2

2 of 31

www.diodes.com

April 2016

ZXLD1366

Block Diagram

Figure 1. Pin Connection for TSOT25 Package

Pin Description

Name

TSOT25

V-DFN3030-6

SO-8EP

Function

Drain of NDMOS switch

GND

2, 5

2, 3, 6, 7

Ground (0V)

ADJ

Multi-function On/Off and brightness control pin:

•

Leave floating for normal operation.(VADJ = VREF = 1.25V giving nominal

average output current IOUTnom = 0.2V/RS)

•

Drive to voltage below 0.2V to turn off output current

•

Drive with DC voltage (0.3V < VADJ < 2.5V) to adjust output current from 25%

to 200% of IOUTnom

•

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

Soft start time increases approximately 0.2ms/nF

ISENSE

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

IOUTnom = 0.2V/RS.

(Note: RSMIN = 0.2V with ADJ pin open-circuit)

VIN

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

capacitor close to device.

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

ISENSE

Adj

Gnd

VIN

50K

20K

1.25V

1.35V

0.2V

600KHz

4.7µF

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