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TPS1HTC30-Q1: TPS1HTC30-Q1 48V capabilities

Matei Serbanescu
Prodigy 20 points
Part Number: TPS1HTC30-Q1
Other Parts Discussed in Thread: TPS1HTC100-Q1

Tool/software:

Hello community,

Is the TPS1HTC30-Q1 switch a good candidate for a 48 V power line, for continuous operation? Its datasheet states that it can go up to 60 V actually.

What should the user pay attention to when operating it at 48 V?

Thanks!

  • 0
    TI__Expert 7761 points

    Hi Matei,

    Yes, the TPS1HTC30-Q1 is designed to be used in a 48V automotive system. When operating at high voltages, the user should pay attention to the load current and transients involved as it can cause the device to heat up faster and go into thermal shutdown. Many 48V systems require testing beyond 60V; for these transients, please make sure you are within the absolute maximum ratings specified in the datasheet as functionality is not guaranteed beyond that and the device may be damaged. Also, depending on the transient voltage, the device may not be able to operate at such high conditions as the VDS clamp may engage. If that is the case, the TPS1HTC100-Q1 has a VDS clamp that engages at a higher value.

    Best Regards,

    Rishika Patel 

  • 0 in reply to Rishika Patel
    Prodigy 20 points

    Thank you!

    The plan is to place it on a 48 V line, already regulated, thus skipping any transient voltage testing.

    I would like to clarify the SNS function, for e.g., if I don't need it and just place a 1kohm resistor to GND (according to the datasheet), wouldn't this affect the maximum load current and trigger a fault?

    DIAG_EN will most likely be at 3.3 V ... Or should I simply put DIAG_EN to GND too and disable this?

    In this case, with no DIAG_EN what protection features still apply?

    Kind regards!

  • 0 in reply to Matei Serbanescu
    TI__Expert 7761 points

    Hi Matei,

    The SNS pin is used to monitor the load current and to observe if there is a fault - it does not have any effect on the maximum load current and will not trigger a fault especially if it is connected to a resistor to ground.

    If DIAG_EN is not used, the analog sense, open-load, and short-to-battery diagnostics are not available. Protections will be normal, faults will just not be reported. Please see below.

    Best Regards,

    Rishika Patel 

  • 0 in reply to Rishika Patel
    Prodigy 20 points

    Thank you very much! This is helpful!

    Is there a SPICE model available for this switch?

  • +1 in reply to Matei Serbanescu
    TI__Expert 7761 points

    Hi Matei,

    No, there is not a SPICE model currently available for this switch. 

    Best Regards, 

    Rishika Patel