ZXLD1360 datasheet(1/28 Pages) ZETEX

Il numero della parte	ZXLD1360

Spiegazioni elettronici	1A LED driver with internal switch

PDF	28 Pages

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Produttore elettronici	ZETEX [Zetex Semiconductors]

Homepage	http://www.diodes.com/

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Issue 1 - March 2007

1

www.zetex.com

ZXLD1360

1A LED driver with internal switch

Description

The

ZXLD1360

is

a

continuous

mode

inductive step-down converter, designed for

driving single or multiple series connected

LEDs efficiently from a voltage source higher

than the LED voltage. The device operates

from an input supply between 7V and 30V and

provides an externally adjustable output

current of up to 1A. Depending upon supply

voltage and external components, this can

provide up to 24 watts of output power.

The ZXLD1360 includes the output switch and

a high-side output current sensing circuit,

which uses an external resistor to set the

nominal average output current.

Output current can be adjusted above, or

below the set value, by applying an external

control signal to the 'ADJ' pin.

The ADJ pin will accept either a DC voltage or a

PWM waveform. Depending upon the control

frequency, this will provide either a continuous

or a gated output current. The PWM filter

components are contained within the chip.

The PWM filter provides a soft-start feature by

controlling the rise of input/output current. The

soft-start time can be increased using an

external capacitor from the ADJ pin to ground.

Applying a voltage of 0.2V or lower to the ADJ

pin turns the output off and switches the device

into a low current standby state.

Features

•

Simple low parts count

•

Internal 30V NDMOS switch

•

1A output current

•

Single pin on/off and brightness control

using DC voltage or PWM

•

Internal PWM filter

•Soft-start

•

High efficiency (up to 95%)

•

Wide input voltage range: 7V to 30V

•

40V transient capability

•

Output shutdown

•

Up to 1MHz switching frequency

•

Inherent open-circuit LED protection

•

Typical 4% output current accuracy

Applications

•

Low voltage halogen replacement LEDs

•

Automotive lighting

•

Low voltage industrial lighting

•

LED back-up lighting

•

Illuminated signs

Pin connections

Typical application circuit

LX

TSOT23-5

Top view

1

2

3

5

4

GND

ADJ

VIN

ISENSE

VIN

ISENSE

LX

GND

ZXLD1360

ADJ

VIN (7V - 30V)

Rs

0.1

4.7 F

C1

GND

N/C

D1

47 H

L1

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