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TLV62568A: Reverse current protection

evs
Genius 5910 points
Part Number: TLV62568A
Other Parts Discussed in Thread: TLV62569A

I'm planning to use the TLV62568A  for charging a Supercap.

When the power is off the supercap is still charged so the current can possibly flow back. Is this a problem for the TLV62568A?

I assume the highside mosfet protect the IC and lift the VCC voltage which is isolated with a diode from the rest of the circuit.

 If not, what is the best way to protect the device?

Thanks!

  • 0
    TI__Mastermind 37141 points

    Hi Ernst,

    TLV62569A does not have reverse current protection.

    Best regards,

    Excel

  • 0 in reply to Excel Regidor
    Genius 5910 points

    Hi Excel,

    Thanks for the reply.

    Do you have a suggested solution for implementing reverse current protection?

    A diode between the L-C and the voltage feedback resistor?

    like this:

    Thanks!

    Edit:: maybe add a C before the Diode in the feedback to add some feedback ripple the peak current controller.

  • 0 in reply to evs
    TI__Mastermind 37141 points

    Hi Ernst,

    The schematic diagram looks fine but this approach was validated during the device development stage. I recommend to fully characterize the circuit if it fits to your application.

    Just a reminder. Placed the FB resistor divider (330k & 100k) as close as possible to the IC and diode as well. The 100k resistor needs to be connected to the IC Gnd pin to avoid regulation error.

    Best regards,

    Excel