ZXLD1320DCATC【PDF 1/18 页】IC LED DRVR WHITE BCKLGT 14-TDFN

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ZXLD1320

Buck mode DC-DC converter for LED driving with

1.5A output and current control

Description

The ZXLD1320 is an inductive DC-DC

converter, with an internal switch, designed

for driving single or multiple LEDs in series up

to a total of 1.5A output current.

Applications cover both commercial and

automotive environments with input voltages

ranging from 4V to 18V. Depending upon

supply voltage and external components, this

can provide up to 24W of output power.

The device employs a variable 'on' and 'off'

time control scheme with adjustable peak

switch current limiting and operates in the

step-down (Buck) operating mode, offering

higher power efficiency and lower system

cost than conventional PFM circuitry.

The device includes the DC-DC converter, a

high-side current monitor and an NPN

switching transistor to provide an integrated

solution offering small PCB size, competitive

cost/performance, high power efficiency of

DC-DC conversion and maximum LED

brightness/reliability. More importantly, it

retains design flexibility to add customer

specific features.

Features

The feedback control circuitry inside the

ZXLD1320 provides excellent load and current

regulation, resulting in very stable LED current

over the full operating voltage and temperature

range.

The LED current can be adjusted from 100%

down to 10% of the set value by applying a dc

voltage to the ADJ pin and down to 1% by

applying a PWM signal. An on-chip LED

protection circuit also allows output current to

be reduced linearly above a predetermined

threshold temperature using an external

thermistor at the TADJ pin.

External resistors set nominal average LED

current and coil peak current independently.

The 'Power-OK' (POK) output flag remains high

during normal operation, but switches low if the

switch transistor remains on for more than

500 μ s. This provides indication of a low battery,

or fault condition. The POK output may be used

to drive an LED or the input of an MCU.

The device can be shut down by applying a

continuous low level dc voltage to the ADJ pin.

Applications

Step-down LED driver

4V to 18V input voltage range

Up to 1.5A output current

Typical efficiency # > 85%

User-defined thermal control of LED

output current using external thermistor

High output current stability over input

Low voltage halogen lamp replacement

with LEDs

High power LED flashlights

LED back-up lighting

General LED lighting

Automotive lighting

voltage and temperature

12 μ A typical standby current

LED current adjustable from 100%

down to 2%

Adjustable soft-start

Power 'OK' flag output

Capable of driving 4 LEDs in series

Note* : Using standard external components as specified under electrical characteristics. Efficiency is dependent upon

external component types and values. Higher efficiency is possible with alternative coils.

Issue 1 - January 2008

? Zetex Semiconductors plc 2008

www.zetex.com

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