ZXLD1356 datasheet(2/29 Pages) DIODES

2 / 29 page

ZXLD1356

Document number: DS33470 Rev. 3 - 2

2 of 29

www.diodes.com

December 2010

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

Drain of NDMOS switch

GND

2, 5

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 24% to 200%

of IOUTnom

•

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

Soft-start time is approx.0.2ms/nF

ISENSE

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

IOUTnom = 0.2/RS

(Note: RSMIN=0.36V 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

detector

Voltage

regulator

ISENSE

Adj

Gnd

VIN

50K

20K

1.25V

1.35V

0.2V

600KHz

4.7

μF

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