CL1
________________________________________________________________________________
1
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
-8.5
A / C Typical Temperature
Coefficient
SOT-89 and D-PAK package
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 20mA5%
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 surface mount SOT-89 and D-PAK
packages.
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.
10/30/03
I
LED
< 20mA
Va
Vb
CL1
Up to 90V
+ V
LED(total)
+
V
LED(total)
-
Va
Control Circuit
and Temperature
Compensation
Vb
Functional Circuit Diagram
CL1
________________________________________________________________________________
2
Va
Vb
TO-252
(D-PAK)
NC
Va
Vb
TO-243AA
(SOT-89)
Va
NC
Package Options
Va
Vb
TO-92
NC
NC = No Connect
Absolute Maximum Ratings*
Va-b, Operating Voltage
100V
T
J
, Operating Junction Temperature
0C to +125C
Ts, Storage Temperature
-55C to +150C
*Absolute Maximum Ratings are those values beyond which damage to the
device may occur. Functional operation under these conditions is not implied.
Continuous operation of the device at the absolute rating level may affect
device reliability.
Thermal Characteristics
Package Power
Dissipation
@
T
A
=25C
JC
C/W
JA
C/W
TO-243AA (SOT-89)
1.3W*
15
78*
TO-252 (D-PAK)
2.0W*
6.0
50*
* Mounted on FR4 board; 25mm x 25mm x 1.57mm.
Ordering Information
Order Number / Package
D-PAK
TO-243AA*
CL1K4 CL1N8
*Same as SOT-89 product supplied on 2000 piece tape reels.
CL1
________________________________________________________________________________
3
Electrical Characteristics
(@ T
J
=25C unless otherwise specified)
Symbol Parameter
Min Typ Max
Units Conditions
Va-b
Maximum operating voltage
90
V
17.1 18.0 18.9 mA Va-b=5V
19.0 20.0 21.0 mA Va-b=45V
Ia-b
Current regulation
21.8 23.0 24.2 mA Va-b=90V
Ia-b/
T
Ia-b temperature coefficient
-8.5 A/C
Va-b=45V,
T
J
=0C to 100C
Ra-b
AC resistance
17 K
Va-b=5.0V to 90V
T
J
Operating junction temperature
0
125
C
0
5
10
15
20
25
0
10
20
30
40
50
60
70
80
90
100
Va-b (Volts)
I
a
-
b
(
m
A
)
Output Current vs Voltage
CL1
________________________________________________________________________________
4
I
LED
~20mA
Vb
Va
CL1
Up to 90V
+V
LED(total)
I
LED
~20mA
Vb
Va
CL1
I
LED
~20mA
Vb
Va
CL1
I
LED
~20mA
Vb
Va
CL1
+
V
LED(total)
-
CL1 for 120V Off Line LED Driver
CL1 for Multiple LED Strings
CL1 for 120V Off Line LED Driver
Vb
Va
CL1
Up to 90V
+V
LED(total)
Vb
Va
CL1
I
LED
~60mA
Vb
Va
CL1
+
_
V
LED
(total)
Package Outlines
1235 Bordeaux Drive, Sunnyvale, CA 94089
TEL: (408) 222-8888 FAX: (408) 222-4895
www.supertex.com
2003 Supertex Inc. All rights reserved. Unauthorized use or reproduction prohibited.
5
TO-243AA (SOT-89:N8)
08/14/03
BSC
BSC
1 2 3
0.177
0.004
(4.4958
0.1016)
0.068
0.004
(1.7272
0.1016)
0.161
0.006
(4.0894
0.1524)
0.096
0.006
(2.4384
0.1524)
0.041
0.006
(1.0414
0.1524)
0.0165
0.0025
(0.4191
0.0635)
0.059
(1.499)
0.118
(2.997)
0.020
0.003
(0.508
0.0762)
0.059
0.004
(1.4986
0.1016)
0.0155
0.0015
(0.3937
0.0381)
0.087
0.003
(2.2098
0.0762)
TO-252 (DPAK:K4)
1
2
3
4
3
2
1
4
0.2585
0.0065
(6.566
0.166)
0.2100
0.0049
(5.335
0.125)
0.0425
0.0075
(1.080
0.190)
0.3898
0.0197
(9.900
0.500)
0.2406
0.0044
(6.1115
0.1115)
0.0299
0.0047
(0.760
0.120)
0.090
(2.286)
BSC
0.0376
0.0073
(0.955
0.185)
0.0325
0.0073
(0.8250
0.1850)
0.0902
0.0035
(2.290
0.090)
0.0203
0.0026
(0.515
0.065)
0.005
(0.127)
max
0.0624
0.0073
(1.585
0.185)
0.1080
(2.743)
REF
0.020
(0.508)
BSC
0.0207
0.0030
(0.525
0.075)
0.2087
(5.300)
min
0.1732
(4.400)
min
5
5
Dimensions in Inches
(Dimensions in Millimeters)
Measurement Legend =
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