ZXLD1350Q 查看數據表（PDF） - Diodes Incorporated.

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ZXLD1350Q

AUTOMOTIVE COMPLIANT 350mA BUCK LED DRIVER

Diodes Incorporated. 

Block Diagram

VIN

ZXLD1350Q

RS

VIN

Voltage

5V

regulator

Shutdown

C1

circuit

ADJ

200k 4KHz

Vref

1.25V

D1

VIN

R1

Current sense circuit

ISENSE

-

+

Comparator

-

+

R2

R3

GND

Block Diagram – Pin Connection

L1

LX

MN

Pin Description

Pin Number

1

2

3

4

5

Pin Name

LX

GND

ADJ

ISENSE

VIN

Description

Drain of NDMOS switch

Ground (0V)

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)

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

(Note: RSMIN = 0.27Ω with ADJ pin open circuit)

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

ZXLD1350Q

Document number: DS37076 Rev. 2 - 2

2 of 21

www.diodes.com

September 2017

© Diodes Incorporated

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