1

Simple 90V 20mA Temperature Compensated

Constant Current LED Driver IC

Features

-8.5

µA / °C Typical Temperature

Coefficient

SOT-89, 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

Typical Application Circuit

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.

A typical application for the CL1 is to drive LEDs with

a constant current of 20mA. They can also be used

in parallel to provide higher currents such as 40mA,

60mA or 80mA. The device is available in SOT-89,

D-PAK and TO-92 packages.

I

LED

< 20mA

Va

Vb

CL1

Up to 90V

+V

LED(total)

+

-

Va

Control Circuit

and Temperature

Compensation

Vb

Functional Circuit Diagram

CL1