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TPS2480: TPS2483

Martin Radev
Prodigy 10 points
Part Number: TPS2480
Other Parts Discussed in Thread: TPS2490, TPS2493, TPS2483, TPS2482, TPS2481, , TPS2491, TPS2492, LM5069, INA293

Dear Madam or Sir,

 

We are developing a current sense solution involving one of the TI Hot Swap Controllers TPS2480, TPS2481, TPS2482, TPS2483. We are considering also TPS2490, TPS2491, TPS2492, TPS2493  or for that matter other Hot Swap Controllers from TI. 

The question we have is on the Current Sense Voltage. It appears from the Datasheet, that Current sense threshold can vary from 45 to 55mV. This is a variation in the current sense accuracy of +/-9% and in such for our application not precise enough. Our question is, is this possible that this variation is only theoretical on paper or it is actually this large in real circumstances? 

Thank you for your support.

 

Yours Sincerely,

Martin Radev

Electronics Developer

SEW PowerSystems GmbH

Wangen im Allgäu

Germany

  • 0
    TI__Guru** 105361 points

    Hi Martin,

    Welcome to E2E!

    Can you share your system requirements (Voltage, max current, target current monitoring accuracy, protection requirements) and your end use case details to help with suitable device.

    We have integrated solutions with advanced features as well to choose. 

    Best Regards,

    Rakesh

  • 0 in reply to Rakesh
    Prodigy 10 points

    Hi rakesh,

    Below are the requirements/ target parameters:

    voltage range is 18V to 30V,

    max/ trip current is 20,0A, 

    target current sense accuracy is 3% for temperatures from 0°C to 70°C,

    protection reaction delay 5ms max,

    timer function would be beneficial but is not required

    We are devoloping are plugable unit with real time monitoring of the current so that the output power N-MOSFET remains in check. Beneficial would we the feature operation in the Safe Operation Area SOA with monitoring on the voltage but it is not required. Thank you for your assistance

    Kind regards,

    Martin

  • 0 in reply to Martin Radev
    TI__Guru** 105361 points

    Hi Martin,

    Thanks for the details.

    All our hot-swap controllers offers current sense accuracy in the range from +/-10% to +/-15%. It is difficult to share the distribution data, the devices are manufactured across multiple fabs and mean can shift. So, distribution data may not help you.

    I think you need INA current sense device to meet your requirement. The shunt resistor can be shared between hotswap and INA

    Best Regards,

    Rakesh

  • 0 in reply to Rakesh
    Prodigy 10 points

    Hello Rakesh,

    thank you for your support. INA293B is our current solution and is very precise. With Hot Swap (LM5069) there is a highly integrated solution built within, N-MOSFET charge pump included. But because of the known fabrication tolerances you mentioned, it wouldnt suffice.

    It seems we would use INA293B in combination with a custom charge pump to switch the external N-MOSFET on and off. 

    If there is a third way i appreciate your feedback Slight smile

    Kind regards,

    Martin

    SEW Power Systems

    Germany

  • 0 in reply to Martin Radev
    TI__Guru** 105361 points

    Hi Martin,

    one question:- Why do you need very high precision? Is the power source very sensitive to overload?

    Best Regards,

    Rakesh

  • 0 in reply to Rakesh
    Prodigy 10 points

    Hello Rakesh,

    The reason is that the extrnal N-MOSFET should stay in the save operationing area SOA in all times and the still ongoing shortage of semiconductors, we want to make sure we have suficient alternatives. Still INA293 from TI is still very precise and as it seems the way to go. Furthermore we made advances with regulated custom charge pump design and tests and would combine it with INA293.

    Best regards,

    Martin

  • 0 in reply to Martin Radev
    TI__Guru** 105361 points

    Understood. Thanks a lot for the sharing the information.

    Best Regards,

    Rakesh