CL1
________________________________________________________________________________
Initial Release
Simple, 90V, 20mA Temperature Compensated
Constant Current LED Driver IC
Features
5.0V to 90V operating range (V
a-b
)
20mA ±5% at 45V V
a-b
-8.5µA / °C Typical Temperature
Coefficient
SOT-89 and D-PAK package
No external components (two terminal
device)
Can be paralleled for higher current
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.
Applications
LED driver
Industrial lamp indicators
Signage
Accent lighting
Automotive
Constant current source
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 surface mount SOT-89 and D-PAK
packages.
Typical Application Circuit
Va
Functional Circuit Diagram
Va
CL1
Up to 90V
+ V
LED(total)
I
LED
< 20mA
Vb
Control Circuit
and Temperature
Compensation
+
V
LED(total)
-
Vb
10/30/03
Supertex Inc. does not recommend the use of its products in life support applications and will not knowingly sell its products for use in such applications unless it receives an adequate "products liability
indemnification insurance agreement." Supertex does not assume responsibility for use of devices described and limits its liability to the replacement of devices determined to be defective due to
workmanship. No responsibility is assumed for possible omissions or inaccuracies. Circuitry and specifications are subject to change without notice. For the latest product specifications, refer to the
Supertex website: http://www.supertex.com. For complete liability information on all Supertex products, refer to the most current databook or to the Legal/Disclaimer page on the Supertex website.
1
SUPERTEX [ Supertex, Inc ]
