ZXLD1352 データシートの表示（PDF） - Diodes Incorporated.

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ZXLD1352

30V 350mA LED DRIVER WITH 1000:1 PWM DIMMING AND AEC-Q100

Diodes Incorporated. 

Block Diagram

VIN

A Product Line of

Diodes Incorporated

RS

ZXLD1352

D1

C1

ADJ

VIN

Voltage

5V

regulator

Shutdown

circuit

50k 600KHz

VIN

R1

Current sense circuit

ISENSE

-

+

Comparator

-

+

R2

Vref

1.25V

R3

L1

LX

MN

GND

Figure 1. Block Diagram

Pin Description

Name

LX

GND

ADJ

ISENSE

VIN

Pin No.

1

2

3

4

5

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 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.

o Adjustment range 0.1% to 100% of IOUTnom for 100Hz < f < 1kHz

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

approx.0.5ms/nF)

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

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

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

device

ZXLD1352

Document number: DS33469 Rev. 3 - 2

2 of 21

www.diodes.com

December 2010

© Diodes Incorporated

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