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Reverse current protection of TPS22910A

Masami Michino
Genius 5070 points
Other Parts Discussed in Thread: TPS22910A

Dear, All

There are the following questions about TPS22910A from a customer.
Please teach me the structure or the operation method of reverse current protection.

Thanks, Masami M.

  • 0
    TI__Expert 5275 points

    Hi Masami,

      

    The TPS22910 provides reverse current protection in ON and OFF states.    When OFF, RCP is always active and will block reverse current.  When ON, the device uses a reverse voltage comparator to sense the voltage across this FET. 

    In this scenario where VOUT is greater than VIN, there is potential for reverse current to flow through the pass FET or the body diode. The TPS22910 monitors VIN and VOUT voltage levels. When the reverse current voltage threshold (VRCP) is exceeded, the switch is disabled (within 10μs typ). Additionally, the body diode is disengaged so as to prevent any reverse current flow to VIN. The pass FET, and the output voltage (VOUT), will resume normal operation when the reverse current scenario is no longer present. See page 15 in the datasheet for more details on RCP when the switch is ON.

    The reverse voltage threshold of this device is 44mV.  This will require ~400mA peak of reverse current across the FET (110mohm max) to engage the RCP when in the ON state.

    Let me know if there are any more, specific questions and I would be happy to help!

      

    Best Regards,

    Adam Hoover

    Load Switch Applications Engineer

  • 0 in reply to Adam Hoover
    TI__Expert 5275 points

    Hi Masami,

     

    I hope the above information was helpful!  Do you have any other questions about this?

     

    Kind Regards,

    Adam

  • 0 in reply to Adam Hoover
    Genius 5070 points

    Hi Adam.

    Thank your reply.

    I'm sorry that reply is slow.
    I answered it to the customer.
    It is satisfactory at this reply, now.

    Thanks, Masami M.

  • 0 in reply to Masami Michino
    TI__Expert 5275 points

    Hey Masami,

     

    No worries here.  Just wanted to make sure we closed the loop.  Do let me know if there are follow on questions.

     

    Best,

    Adam

     

    P.S. Thanks for verifying my answer to this question!

  • 0 in reply to Adam Hoover
    Prodigy 30 points
    Hi,

    I have an additional question. Is 6V the maximum voltage that the TPS22910 can tolerate in the output? We would like to use this device in one of our applications, but the reverse voltage to be protected against in the fault situation is 12V.

    Best Regards,
    Ari
  • 0 in reply to Ari Kurttila
    TI__Genius 15760 points

    Hi Ari,

    You are correct, 6V is the maximum voltage that the TPS22910 can tolerate.  Putting 12V on any of the pins will risk damaging the device.

    Regards,

    Alek Kaknevicius

  • 0 in reply to Aleksandras_Kaknevicius
    Prodigy 30 points
    Hi Alek,

    Thank You for the confirmation.

    BR, Ari