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Use of TPS2493 in Hot Swap power module

TERRY COX
Prodigy 40 points
Other Parts Discussed in Thread: TPS2493, TPS2393, TPS2490, TPS2480

I have two questions concerning the use of a TPS2493 in a hot swap power module application.

1) The hot swap controller is typically used on the plug in card (load) side. In my application, the load is fixed and the power module is pluggable. Any issues to watch out for by using the TPS2493 on the plugable power supply side vs. the load side? My load condition is 100W at 48V.

2) My application requires the output to meet the requirements for a UL60959 limited power source (100W). I would like to use the TPS2493 current limit function to meet the UL LPS requirement. Any inputs or concerns here?

  • 0
    TI__Genius 9415 points

    It doesn't matter much if the hot swap controller is on the backplane or the board. When mounted on the backplane it's best to put a common schottky diode on the output rail (cathode side) to GND (Anode side). This is helpful to catch any negative voltage spike created when the load is removed.

    We have not had our TPS2393 tested with UL. The TPS2493 has an external FET. The application circuit can be certified but not the part. alone. Since the app circuit  will be different from your circuit, you would still be obliged to have your circuit tested even if we had atested our App.  

  • 0 in reply to Bob Kando
    TI__Expert 7990 points

    Hotswaps provide plug in protection and fault (overload) protection.

    Your system design should provide for plugin with no voltage on the 48V pins to protect the connector contacts.

  • 0 in reply to Bob Kando
    Prodigy 40 points

    Thanks for the input. From UL, this type of circuit falls under the QVGS2 category (Protectors, Low-voltage Solid-state Overcurrent). So my circuit would need to pass the tests for the QVGS2 category. Are you familiar with this category? Does TI offer any other parts that would be UL recognized under the QVGS2 category? 

  • 0 in reply to TERRY COX
    TI__Expert 7990 points

    I think you meant UL60950 in your original email.  I could no tfind a UL60959.

    Strictly speaking, UL was recognizing ICs as power limiters under a proprietary standard.  The IEC was many, many years behind in recognizing the technology.  TI has many devices listed under E169910.  Subsequently, the IEC improved their standard (clause 2.5) under IEC60950-1 Rev 2, ammendment 1 (2009).  We have a number of devices having passed a CB inspection under the new ammendment.  VIrtually all these devices are self-contained limiters, with a few having adjustable current limit and none of them rated to >20V.

    However, you are asking for a 60V+  "regulating circuit" listing/recognition.  As the TPS2490/91/92/93 and TPS2480/81 hotswap controllers are only a part of the total circuit, and there are numberous options for such a circuit, it is not practical to attempt to list one.