CL1

Features

5.0 to 90V operating range (V

20mA ±5% at 45V (V

-8.5µA/°C typical temperature coefficient

Available in TO-243AA (SOT-89), TO-252 (D-PAK),

& TO-92 packages

No external components (two terminal device)

Can be paralleled for higher current

Applications

LED driver

Industrial lamp indicators

Signage

Accent lighting

Automotive

Constant current source

Constant current sink

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General Description

The Supertex CL1 is a high voltage, temperature compensated,

constant current source. The device is trimmed to provide a

constant current of 20mA±5% at an input voltage of 45V. No

external components are required. The device can be used

as a two terminal constant current source or constant current

sink.

Atypical application for the CL1 is to drive LEDs with a constant

current of 20mA. Multiple CL1s can also be used in parallel to

provide higher currents such as 40mA, 60mA or 80mA. The

device is available in TO-243AA (SOT-89), TO-252 (D-PAK),

and TO-92 packages.

Typical Application Circuit

Simple, 90V, 20mA, Temperature Compensated,

Constant Current, LED Driver IC

I

LED

20mA

VA

VB

CL1

Up to 90V

+

-

VA

Control Circuit

and Temperature

Compensation

VB

Functional Circuit Diagram