ZXLD1352 datasheet(2/21 Pages) DIODES

2 / 21 page

ZXLD1352

Document number: DS33469 Rev. 3 - 2

2 of 21

www.diodes.com

December 2010

A Product Line of

Diodes Incorporated

Block Diagram

Figure 1. Block Diagram

Pin Description

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. (V

ADJ = 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<V

ADJ<2.5V) to adjust output current from 25% to 200%

† of I

OUTnom

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

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)

ISENSE

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

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

50k

1.25V

600KHz

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