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TPS2663: Achieving NEC Class 2 requirements with over 39V limit

Jon Byars
Prodigy 10 points
Part Number: TPS2663
Other Parts Discussed in Thread: TPS1663,

Tool/software:

I am trying to design a device that can power a number of NEC Class 2 rated circuits from a single 480W power supply at higher voltages ~60V or even 48V.  I have been unable to find anything 'off-the-shelf' for my product and have been looking into a potential custom board design.  However, I have been unable to find a solution from TI that offers a UL rated device with a PLIM pin that allows for power limiting at greater than 39V.  Is there some factor I am missing that prevents electronic fuses/circuit breakers from operating above this 39V threshold while still achieving a class 2 rating?  Is it possible to use a higher over-voltage threshold device without a plim pin and develop an external power monitoring circuit to achieve UL 1310 requirements?    

  • 0
    TI__Mastermind 36781 points

    Hello Jon,

    You are looking for a power limit of 480W?

    TPS2663 and TPS1663 has power limit variants which are UL rated. But power limit is 150W.

    With parallel configuration you can achieve that with 2 x TPS2663/TPS1663. We have app note for that.

    Parallel Operation of TPS2663 eFuses

    External power limit also you can implement on current limiting eFuse like below App note. Check figure-7.

    Designing Low-Power Circuits (LPCs) using an eFuse for Household and Similar App

    Thanks 

    Amrit 

  • 0 in reply to Amrit Jit
    Prodigy 10 points

    I am looking to split a 480W power supply into 4-8 Class 2 circuits (less than 100W each channel) with a overload voltage rating between 48V and 60V.  TPS2663 versions that control power with a plim pin have fixed overload voltages of up to 39V.  My question is why not offer a version with a plim pin that can reach the full 60V overload voltage?  Is there a good solution for limiting power to under 100W with an eFuse running up to 60V while maintaining Class 2 rating (UL 1310 requirements) or is there some limitation I am unaware of?

  • +1 in reply to Jon Byars
    TI__Mastermind 36781 points

    Hello Jon,

    Yes, You are correct. With TPS2663 adjustable OVP is not available with power limit variant.

    However, TPS16637 variant has no OVP clamp and power limit and it's UL certified recently.

    It's not updated in datasheet yet. Find the variant below. It's orderable on ti.com

    Thanks

    Amrit