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TPS543B20: High Side short circuit protection fault threshold

Toshiro Imi
Expert 6950 points
Part Number: TPS543B20

Tool/software:

Hello,

Our customer is trying to use TPS543B20 up to 45A output current while he looks at IHSOC of high side short circuit protection fault threshold. Then he has some questions 

1) Does TPS543B20 limits in 45A of IHSOC if the customer makes ILIM left open ?

2) Could you let him know the reason TPS543B20 defines IHSOC in datasheet ?

3) Could you let him know IHSOC max number ?

4) Would it have any output rash current specification e.g. max rush current and the duration, while TPS543B20 start up ?

Best regards,

  • 0
    TI__Expert 7236 points

    Hello, 

    The TPS543B20 does not support 45A output current. This device is only suitable for applications up to 25A, 2x TPS543B20's could support this application with 22.5A on each phase. 

    Best regards,

    Britton

  • 0 in reply to Britton Jones
    TI__Expert 6950 points

    Hello,

    Thank you very much for your feedback.

    The customer has 3 questions.

    1) Could you tell me why TPS543B20 cannot drive higher than 25A, even though the datasheet specify 45A short cricuit current ? Are there any side effect will be happened when a customer drive higher than 25A ?

    2) Can ILIM be left open, if the customer do not need ILIM function. ?

    3) Could you tell him why current limit should programm at ILIM pin ? are there any background the customer should program current limit by ILIM ?

    Best regards,

  • 0 in reply to Toshiro Imi
    TI__Expert 7236 points

    Hi Toshiro,

    The low side mosfet is not able to handle 45A safely, it is going to risk device damage to go above the stated datasheet limit of 25A. 

    I do not recommend leaving ILIM open as that will not set a low side fet protection limit in case of an overcurrent event. Without setting an ILIM you will risk device damage if an overcurrent event happens. Please set the ILIM value to 5-10A above the target load current. This is only to protect the device in cases of temporary current spikes, the device is not intended to operate above 25A continuously.

    Best regards,

    Britton