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CL25
Simple 90V, 25mA, Temperature Compensated, Constant Current, LED Driver IC
Features
5.0V to 90V operating range (VA-B) 25mA 10% at 5-90V 0.01% / C typical temperature coefficient No external components (two terminal device) Can be paralleled for higher current
General Description
The Supertex CL25 is a high voltage, temperature compensated, constant current source. The device is trimmed to provide a constant current of 25mA 10% at an input voltage of 5-90V. 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 CL25 is to drive LEDs with a constant current of 25mA. They can also be used in parallel to provide higher currents such as 50mA, 75mA or 100mA. The device is available in TO-92 and TO-243AA (SOT-89) packaging.
Applications
LED channel lighting Industrial lamp indicators Accent lighting
Typical Application Circuit
VA
Functional Circuit Diagram
VA
CL25 Up to 90V
+ VLED(total)
VB Control Circuit and Temperature Compensation
+
ILED 25mA
VLED(total)
VB
-
CL25
Ordering Information
Device CL25 Package Options TO-92 CL25N3-G TO-243AA (SOT-89) CL25N8-G
-G indicates package is RoHS compliant (`Green')
Thermal Characteristics
Package TO-92 TO-243AA (SOT-89) Power Dissipation @TA = 25OC 0.6W 1.3W*
O
Pin Configuration
JC C/W
O
JA C/W
VB
125 15
170 78*
* Mounted on FR4 board; 25mm x 25mm x 1.57mm
Absolute Maximum Ratings
Parameter Operating voltage, VA-B Operating junction temperature, TJ Storage temperature, TS Value 100V -40C to +125C -55C to +150C
VA NC VB (front view) VA VB NC
TO-92
TO-243AA
(top view) NC = No Connect
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. All voltages are referenced to device ground.
Electrical Characteristics
(TJ=25C unless otherwise specified)
Symbol VA-B IA-B IA-B/T TJ RA-B
Parameter Operating voltage Current regulation IA-B temperature coefficient Operating junction temperature Dynamic resistance
Min 5 22.5 -40 -
Typ 25 0.01 300k
Max 90 27.5 125 -
Units V mA %/ C
O O
Conditions --VA-B = 5V - 90V VA-B = 45V, TJ = -40OC to +100OC -----
C
Functional Circuit Diagram
VA
Equivalent Block Diagram
VA
Control Circuit and Temperature Compensation
25mA 10%
VB
VB
2
CL25
Temperature Characteristics
1.02
Current, normalized to 25C
1.01
1.00
0.99
5V 10V 30V 45V 90V
0.98 -55
-35
-15
5
25
45
65
85
105
Temperature (C)
Output Current vs Voltage
30 25 20 15 10 5 0
I A-B (mA)
0
10
20
30
40
50
60
70
80
90
100
VA-B
3
CL25
CL25 for Multiple LED Strings
VA VA VA VA
Up to 90V
+VLED(TOTAL)
CL25
ILED 25mA
VB
CL25
ILED 25mA
VB
CL25
ILED 25mA
VB
CL25
ILED 25mA
VB
+
VLED(TOTAL)
-
CL25 for Higher Current
VA VA VA
Up to 90V +VLED(TOTAL)
CL25
VB
CL25
VB
CL25 +
VB
ILED 75mA
VLED(TOTAL)
_
4
CL25
3-Lead TO-92 Package Outline (N3)
0.135 MIN 0.125 - 0.165 0.080 - 0.105 1 2 3
Top View
0.175 - 0.205 0.170 - 0.210 123
Seating Plane
0.500 MIN 0.014 - 0.022 0.014 - 0.022 0.045 - 0.055 0.095 - 0.105
Front View
Side View
Notes: All dimensions are in millimeters; all angles in degrees.
3-Lead TO-243AA (SOT-89) Package Outline (N8)
4.50 0.10 1.72 0.10 0.40 0.05
Exclusion Zone
1.50 0.10
4.10 0.15 2.45 0.15 2.21 0.08
No Vias/Traces in this area. Shape of pad may vary.
1.05 0.15 0.42 0.06 1.50 BSC 3.00 BSC 0.5 0.06
Top View
Side View
Bottom View
Notes: All dimensions are in millimeters; all angles in degrees.
(The package drawings in this data sheet may not reflect the most current specifications. For the latest package outline information go to http://www.supertex.com/packaging.html.)
Doc.# DSFP-CL25 A121506
5

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