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TPS1211-Q1: Connecting CS+/CS- between Mosfet Drain Source?

Asim
Prodigy 10 points
Part Number: TPS1211-Q1

Tool/software:

Is it possible to measure the current and having short circuit protection from FETs internal resistance? What will happen in the turn-off state?

Thanks and regards,

Asim

  • 0
    TI__Expert 8460 points

    Hi Asim, 

    Can you help clarify what you mean by "from FETs internal resistance"?

    The TPS1211-Q1 device is designed such that current can be monitored through the RSNS resistor at IMON to GND. This is used as a current mirror to monitor short circuit events. In this way, yes you can both monitor current and maintain short circuit protection. You cant have short circuit protection without monitoring current. 

    In the event of a short circuit detection the PD will pull low to SRC and shut off the FET within a specified time. FLT_I also goes low. You can configure the CTMR value to begin retrying to turn on the FET. This can be configured to completely latch off (not retry), or retry a specific number of times. 

    This information is detailed in section "8.3.3.1 Overcurrent Protection with Auto-Retry" and "8.3.3.3 Short-Circuit Protection" of the data sheet. 

    Thank you, 

    Sarah

  • +1 in reply to Sarah Raines
    Prodigy 10 points

    Hi Sarah,

    I mean the configuration like below. 

    Thanks,

    Asim

  • 0 in reply to Asim
    TI__Expert 8460 points

    Hi Asim, 

    I understand. You cannot connect the C+ and a C- between the drain and source with TPS1211 device. The Absolute maximum rating for voltage between C+/C- is listed at 0.3V. When the device is turned off and during turn on the voltage would be greater than 0.3V with RDSON sensing. 
    The diagram you are showing is for TPS1200, which has a much higher absolute maximum. 

    Thank you,

    Sarah