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Original question:

TPS1HB08-Q1: Pin 15 Internal connection

TPS1HB08-Q1: reverse current ratings

Elec Cheng
Expert 7055 points
Part Number: TPS1HB08-Q1

Hi Expert,

I am reading ST VN7008 datasheet and find some confusion parts.

1. I see that they have a parameter, reverse DC output current. Do we have similar parameter like that? 

2. They say the diode&res network can protect driving inductive load. But I don't really understand how it protects. Is it the same as our high side? May you help clarify based on your knowledge? Thanks.

BR,

Elec Cheng

  • 0
    TI__Genius 16390 points

    Hi Elec,

    For 1. the reverse max current will be close to the nominal current since the switch will be auto enabled during reverse current situation. It will be a bit less since the reverse Ron will be higher than the forward Ron.

    2. Without the resistor, during an inductive discharge, the IC_GND will be pulled to Output negative voltage since there is parasitic path inside the IC from IC_GND to output. The GND network helps to pull the IC_GND close to the system GND during the inductive discharge.

    Please let me know if you have additional questions.
    Regards,

    Yichi

  • 0 in reply to Yichi Zhang.
    TI__Expert 7055 points

    Hi Yichi,

    Thanks for your support here. 

    Yichi Zhang. said:
    or 1. the reverse max current will be close to the nominal current since the switch will be auto enabled during reverse current situation. It will be a bit less since the reverse Ron will be higher than the forward Ron.

    But  how does the high switch know there is reverse current or reverse battery happening? Thanks.

    BR,

    Elec Cheng

  • 0 in reply to Elec Cheng
    TI__Expert 7055 points

    Hi Yichi,

    Any feedback about this question? Thanks.

    BR,

    Elec Cheng

  • 0 in reply to Elec Cheng
    TI__Genius 16390 points

    Hi Elec,

    Sorry for the delayed reply. Usually a certain pin in the device (EN pin) for example, that connects to the internal logic. Once the reverse voltage is at the pin, it will turn-on the gate for the MOSFET automatically. Please let me know if you have additional questions.
    Regards,

    Yichi