ZXLD1350Q_17 datasheet(2/21 Pages) DIODES

2 / 21 page

ZXLD1350Q

Document number: DS37076 Rev. 2 - 2

2 of 21

www.diodes.com

September 2017

ZXLD1350Q

Block Diagram

– Pin Connection

Pin Description

Pin Number

Pin Name

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 Analog voltage:



0.3V < VADJ < 2.5V  adjusts 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 pin to VIN to define nominal average output current IOUTnom = 0.1/RS

(Note: RSMIN = 0.27

Ω with ADJ pin open circuit)

VIN

Input voltage (7V to 30V). Decouple to ground with 1µF of higher X7R ceramic capacitor close to device

VIN

Comparator

GND

VIN

ISENSE

Current sense circuit

VIN

ADJ

Voltage

regulator

Shutdown

circuit

Vref

200k

1.25V

4KHz

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