ZXLD1360 datasheet(2/25 Pages) DIODES

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ZXLD1360

Document number: DS33471 Rev. 3 - 2

2 of 25

www.diodes.com

December 2010

A Product Line of

Diodes Incorporated

Block Diagram

Figure 1. Block diagram – Pin Connection for TSOT23-5 Package

Block Diagram

Name

Pin No.

Description

Drain of NDMOS switch

GND

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 = 0.1/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

•

Drive with PWM signal from open-collector or open-drain transistor, to adjust output current.

•

Adjustment range 25% to 100% of IOUTnom for f>10kHz and 1% to 100% of IOUTnom for f < 500Hz

•

Connect a capacitor from this pin to ground to increase soft-start time. (Default soft-start time =

0.5ms. Additional soft-start time is approx.0.5ms/nF)

ISENSE

Connect resistor RS from this to VIN to define nominal average output current IOUTnom=0.1/RS

(Note: RSMIN=0.1V with ADJ pin open circuit)

VIN

Input voltage (7V to 30V). Decouple to ground with 4.7µF of higher X7R ceramic capacitor close to

device

Low voltage

detector

Voltage

regulator

ISENSE

Adj

Gnd

VIN

200K

20K

1.25V

1.35V

0.2V

4.7mF

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