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TPS2HB35-Q1: what is the max continuous load current

Sherry Liang
Genius 10255 points
Part Number: TPS2HB35-Q1

Dear team,

In the datasheet, we list the typ continuous load current 3.5A/ch. My customer wants to know what the max continuous load current is? Why typ value is 3.5A? How to compute it?

In addition, the max current limit is 25A. I don't know why our current limit can be so large. After all our continuous current is only 3.5A or 5A. What is the benefit for large current limit? Is there any relationship between continuous load current and current limit?

Thanks & Best Regards,

Sherry

  • +1
    TI__Genius 16390 points

    Hi Sherry,

    The max current is derived from thermal limitations. For continuous current of 3.5A/5A with 70 degC ambient, then our part will be near the thermal limitations. However, if the ambient temp is lowered or there are other means of cooling such as forced air etc. Then the current can be higher.

    For large inrush limit, it's for initial cap charging/bulb driving. It allows the cap to be charged at a faster rate, but it meant for short duration. The short-term thermal impedance will be smaller than the steady state thermal impedance, that's why a higher current limit can be used during start up. 

    Regards,

    Yichi