zxld1366 Zetex Semiconductors plc., zxld1366 Datasheet

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zxld1366

Manufacturer Part Number

zxld1366

Description

High Accuracy 1a, 60v Led Driver With Internal Switch

Manufacturer

Zetex Semiconductors plc.

Datasheet

1.ZXLD1366.pdf (32 pages)

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ZXLD1366

High accuracy 1A, 60V LED driver with internal switch

Description

The

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 6V and 60V and

provides an externally adjustable output

current of up to 1A. Depending upon supply

voltage and external components, this can

provide up to 48 watts of output power.

The ZXLD1366 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.

Features

•

•

•

•

•

•

•

•

Pin connections

Issue 2 - September 2008

© Diodes Incorporated 2008

GND

ADJ

LX

Typically better than 0.8% output current

accuracy

Available in thermally enhanced DFN

package

Simple and with low part count

Single pin on/off and brightness control

using DC voltage or PWM

PWM resolution up to 1000:1

High efficiency (up to 97%)

Wide input voltage range: 6V to 60V

Inherent open-circuit LED protection

1

2

3

ZXLD1366

TSOT23-5

Top view

5

4

V

I

SENSE

IN

is

a

GND

ADJ

LX

continuous

DFN633

Top view

mode

GND

I

V

SENSE

IN

1

The ADJ pin will accept either a DC voltage or a

PWM waveform. Depending upon the control

frequency, this will provide either a continuous

(dimmed) or a gated output current. Soft-start

can be forced 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.

Applications

•

•

•

•

•

•

•

•

•

Typical application circuit

V

IN

Low voltage halogen replacement LEDs

Automotive lighting

Low voltage industrial lighting

LED back-up lighting

Illuminated signs

Emergency lighting

SELV lighting

LCD TV backlighting

Refrigeration lights

(24V)

GND

C1

Diodes Incorporated

100nF

4.7 F

A Product Line of

ADJ

V

IN

D1

0.2

Rs

ZXLD1366

I

SENSE

GND

L1

LX

www.diodes.com

www.zetex.com

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