CL320

General Description

The CL320 is designed to drive 3 strings of LEDs at a

constant current of 20mA.

Other drivers with currents in the range of 20 - 30mA are

available. The drive current is fixed, with a ±6% tolerance

over a V

Separate enable pins for each channel allow for PWM

dimming, 3-step linear dimming, or individual disconnection

of faulty LED strings.

Over-temperature protection circuitry shuts down all 3

channels when the nominal die temperature reaches 135°C.

Normal operation resumes when the die temperature drops

by 30°C.

The CL320 is available in the 8-Lead SOIC (w/Heat Slug)

package and requires a single ceramic bypass capacitor

which may be shared among several drivers.

Block Diagram and Typical Application Circuit

3-Channel 20mA Linear LED Driver

Features

±6% current accuracy @ 4.0 -15V

90V standoff voltage

Separate enable pins for each channel allow for

PWM dimming

Over-temperature protection

8-Lead SOIC (w/Heat Slug) package

Applications

LCD backlighting

Indicator lamps

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EN1

EN2

EN3

OUT1

OUT2

OUT3

GND

6.5 - 90V

CL320

REG

VIN

Host

Controller

1

2

3

87

6

5

4

100nF