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TPS4H160-Q1: Overcurrent spec for each channel

Frank QIN
Expert 8890 points
Part Number: TPS4H160-Q1

Tool/software:

Hi Team,

We are planning to use TPS4H160-Q1 for a four-channel lighting load, the load current requirement is 2.5+0.5+0.5+0.3=3.8A. We calculated the thermal with 85C, each channel overcurrent capacity is 1.3A, looks good overall.

While we found in the datasheet, nominal DC load current is marked as 0-2.5A. Is this 2.5A means the current on each channel cannot exceed 2.5A? I suppose the overcurrent limit is configurable which is 8A. Are I understand the correct?

We concern the requirement for each channel is 2.5A, peak current is below 5A, while the constant current might exceed 2.5A a little bit. Would that be a problem?

Thanks

Best,

Frank

  • 0
    TI__Mastermind 28490 points

    Hi Frank,

    Are all of the VOUT pins driving the full load together, or is 2.5A on VOUT1, 0.5A on VOUT2, etc?

    The nominal 2.5A load current primarily considers thermal properties - for instance at 85C, the part can output 2.5A without hitting thermal shutdown. Calculations show that the device driving 3.8A won't trigger thermal shutdown at Ta = 25C, but can soon above that temperature. If all four loads can be driven simultaneously by all channels in parallel so the current is shared more or less equally, this will be best as the average transient thermal impedance will be lowest and the temperature rise will be least.

    Thanks,

    Patrick