File E169910
SR5835820-T001

March 20, 2010

REPORT

On

Protectors - Component Protectors, Low-voltage Solid-state Overcurrent - Component

Texas Instruments Inc
DALLAS, TX

           Recognized Company:  Texas Instruments Inc 

Copyright  2010 Underwriters Laboratories Inc.

Underwriters Laboratories Inc. authorizes the above named company to reproduce the latest pages of that portion of this Report consisting of this Cover Page through Page 7.

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DESCRIPTION

PRODUCT COVERED:

	*USR:  Component – Low voltage solid-state overcurrent protectors, Model TPS-2420, TPS-2590, and SN1010017 may be followed by RSA, may be followed by R.

GENERAL:

These devices are solid-state overcurrent protectors. These devices limit the output current to a safe level when the output lead exceeds the current-limit threshold or a short-circuit is present.  These devices are intended to be used on the load-side of an isolating transformer, power supply or battery to provide a means of supplementary protection. 

Electrical Ratings

Model	Input Voltage [Vdc]	Continuous Current Output Rating [A]	Protective Current Limit [A]	
TPS-2420/2590 Series (1)/ SN1010017	3.0 to 20.0	0.8	1.2	
TPS-2420/2590 Series (2)/ SN1010017	3.0 to 20.0	3.6	4.4	

				

     (1) – With Resistor RFLT = 200kΩ  
     (2) - With Resistor RFLT = 49.9kΩ    - Minimum value              

Environmental Ratings

Model	Operating Temperature [°C]	Shipping and Storage Temp per UL 2367(°C)	
ALL	-40 to 85	-30 to 130	

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Nomenclature

TPS-2420		RSA		R		X		
I		II		III		IV		

I.	Basic Designation
	TPS-2420 Series
      TPS-2590 Series
	SN1010017

II.	Packaging Type

RSA:  (4-mm × 4-mm QFN)

III.	Handling Code
R:  Tape & Reel

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MODEL DIFFERENCES:

	Models TPS2420 and TPS2590 Series are identical except TPS2590 Series is not provided with some features that TPS2420 Series incorporates.
	Packages covered are as indicated below:

	

Model SN1010017 is identical to Model TPS2590 Series, except for model designation.

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TECHNICAL CONSIDERATIONS (NOT FOR FIELD REPRESENTATIVE USE):

	Use - For use only in complete equipment where the acceptability of the combination has been determined by Underwriters Laboratories Inc. 

USR indicates investigation to the United States Outline of Investigation For Solid State Overcurrent Protectors, UL Subject 2367, issued May 13, 2004. 

Conditions of Acceptability – 

1.	These devices are integrated circuits and electrical spacings within the device are not specified. 

2.	These devices are entirely electronic in nature and have no means for manual operation or reset. 

3.	The terminals of these devices are for factory wiring only and intended to be mounted on a printed wiring board.  

4.	These devices have only been evaluated for supplementary overcurrent protection of secondary circuits supplied by the load side of a transformer or battery, and have not been evaluated for branch-circuit protection. 

5. 	These devices have been investigated as electronic overcurrent protective devices in accordance with the requirements contained in Subject 2367 – Outline of Investigation for Solid State Overcurrent Protectors. As a result, use is permitted only on the load-side of an isolating transformer, power supply or battery with maximum levels limited as follows:

Output Voltage (Voc)	Output Current (Isc)	VA	
Vac	Vdc	A	(V×A)	
 20	 20	1000 / Voc	 250	
20 < Voc  30	20 < Voc  30	1000 / Voc	 250	
—	30 < Voc  60	1000 / Voc	 250	

6.	Use on secondary supply circuits with a higher power capability requires additional evaluation for reliability, such as are contained in the Standard for Safety-Related Controls Employing Solid-State Controls, UL 991. 

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7. 	These devices have not been subjected Tests for Telecom applications and their suitability for connection to telecommunication networks with outside plant connections should be determined in the end-use. 

8. 	These devices were evaluated with respect to continuous current operation at the current levels shown in the electrical ratings section of this report.

9.	These devices have been subjected to environmental conditionings with respect to the following conditions (per UL Subject 2367):
Shipping and Storage: -30°C to 130°C
Temperature Range: -40°C to 85°C
Thermal Cycling
Endurance
Abnormal

10.  	Product shall be installed with surge protection at the input rated
     	minimum for the rated voltage range. 

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11.	These devices were tested in the circuit shown below. The following components should be used in the end use application: C3 rated 0.1uF, 25Vdc; D4 rated 1A, 15V, 400W; C4 rated 0.58uF 10V. This device was tested and evaluated using the external capacitors/resistors shown in the schematic and outlined above. Malfunction such as oscillation may occur causing unacceptable results and/or performance if different or no such capacitors are used.  Q1 and Q2 are used on the board to turn on the indicator LEDs and have nothing to do with protection functions.  All other components are not considered critical for the operation of the device. The smallest value for external resistor Rflt= 49.9Kohm to ensure rated overcurrent protection remains under 4.4 Amps.        

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MARKING: 

The manufacturer’s name, trade name or trademark, catalog number, electrical ratings and Recognized Component Mark  (due to the small size of the device, the catalog number and Recognized Component Mark may appear on the smallest package or reel).  Additional suffixes after the model number designate the type of integrated circuit package, integrated circuit lead types, or other features that are considered not to affect the functionality of the device.

CONSTRUCTION DETAILS:

Insulated Housing – Epoxy – using a high pressure, high temperature molding process, rated 130 C.

FIG. #	Description	
1	Test board for Model TPS2420 which is considered of all models	

ILL. #	Description	
1 and 2	Specification sheet for Models TPS2420 and TPS2590 Series