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TLV755P: Regarding reverse current protection of TLV755P, TLV758P and TLV759P

Shinichi Inoue
Guru 19671 points
Part Number: TLV755P
Other Parts Discussed in Thread: TLV759P, TLV758P,

Dear Specialists,

My customer is considering TLV755P, TLV758P and TLV759P.

He has an inquiry, I would be grateful if you could advise.

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According to the datasheet of Reverse Current, an external diode is recommended when the output cap is large.

When the input power is off, output should be discharged but Vin<Vout+0.3V is happen in a short time.  

Could you please let me know, when using 20uF output cap, is this value large enough or not?

In this condition, is it possible not to use external diode.

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I appreciate your great help in advance.

Best regards,

Shinichi

  • 0
    TI__Guru 55940 points

    Hi Shinichi,

    An external Schottky Diode is recommended for any application where Vout is expected to exceed Vin.  This external diode will provide a robust path for the reverse current.  A Schottky Diode is used due to its low forward voltage characteristics.

    The internal body diode is a parasitic diode and the current through this diode is not limited.  While a short duration of reverse current will help mitigate the risk of damage, we still recommend placing an external Schottky Diode on any application where reverse current is expected.

    Very Respectfully,

    Ryan

  • 0 in reply to Ryan Eslinger
    Guru 19671 points

    Hi Ryan,

    Thank you for your reply.

    I understand the external diode is recommended when small output capacitance is used.

    I'll share this information with the customer.

    If he has an additional question, I consult you again.

    I appreciate your great help and cooperation.

    Best regards,

    Shinichi