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SLUA962

dtluigi
Intellectual 595 points

Messrs TI,

following your application note SLUA962, in order to avoid to damaging the converter because of reverse current, is it possible to choice a synchronous DC/DC converter with a Vin_min>Vout?

If this works the user could avoid to use a UVLO setting with a voltage divider.

  • 0
    TI__Expert 4035 points

    Hi Dtluigi,

    It maybe work but it's not easy to pick out a part with Vin_min > Vout to meet high output cases.

    BRs,

    Ryan

  • 0 in reply to Ryan Hu (BSR-MV)
    Intellectual 595 points

    I agree with you, in fact I am focused on low output voltage (3,3V-3,8V).

    Do you think it could be an issue to have a synchronous DC/DC without UVLO divider resistor and with a Vin_min=3V so with a dV=Vout-Vin_min<1V?

    Do you have measured a threshold (Vout-Vin_min) above which it is recommended to use a UVLO divider resistor?

    Regards

    Luigi

  • 0 in reply to dtluigi
    TI__Expert 4035 points

    Hi Luigi,

    Since the output voltage is not very high, it would not be a damage risk by reverse current.

    In most applications, no big reverse current existed. And having reverse current doesn't mean damage risk. Usually we can set the start / stop VIN voltage higher than target output voltage to avoid reverse current damage risk. It's not a must. I have no certain answer if a UVLO resistor network needed. Different Rdson, inductor DCR/Value, different voltage gap between VIN_UVLO and Vout would result in different reverse current. So the answer is case by case.

    BRs,

    Ryan