ZXLD1350

30V 350mA LED DRIVER with AEC-Q100

ZXLD1350

Document number: DS33468 Rev. 8 - 2

2 of 22

www.diodes.com

March 2011

© Diodes Incorporated

A Product Line of

Diodes Incorporated

Block Diagram

Figure 1. Block diagram – Pin Connection

Pin Description

Name

Pin No.

Description

LX

1

Drain of NDMOS switch

GND

2

Ground (0V)

ADJ

3

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

4

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)

VIN

5

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

device

MN

-

+

VIN

Comparator

R1

R2

R3

GND

-

+

LX

VIN

ISENSE

Current sense circuit

VIN

ADJ

RS

L1

D1

5V

Voltage

regulator

Shutdown

circuit

Vref

200k

1.25V

4KHz

C1