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TPS7A4501-SP: Current Limit

Richard Pappalardo
Prodigy 30 points
Part Number: TPS7A4501-SP

The table in data sheet section 7.6 lists Current Limit as 1.9A typical for a differential voltage of 7V.  Data sheet Figure 14 shows the Current Limit as about 2.4A typical for the same differential voltage.  Which one is correct?

  • +1
    TI__Guru 62930 points

    Richard,

    My interpretation, is that these two entries do not have same conditions.

    The electrical table has a Vin to Vout differential with Vout =0 V.

    Figure 14 has graphs by Vin to Vout forced to Vout = Vout programmed -100mV.

    So in the first case Vout is shorted to ground.  In the second, a simulated heavy load causing Vout to be 100mV below programmed.

    In the graph, the Vin to Vout delta of 7V, has multiple solutions for Vout.   One solution could be Vin of 8, programmed Vout of 1, with Vout forced to 900mV.    Unfortunately, I do not have the exact conditions that were used to generate this graph.   Its intent is to show how the safe operating area of device changes the current limit based on the Vin to Vout differential.  The electrical table is showing current limit behavior with a short to ground with a 7 V Vin   This is independent of what Vout feedback divider is set to.

    Hopefully this resolves your query.

    If so, lease click this resolved my question.
    Regards,
    Wade