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TPS4H160-Q1: offset leakage current

Fei Jiang
Prodigy 60 points
Part Number: TPS4H160-Q1

Hi TI experts，

How to understand Rpu can offset leakage current?

As i can understand, Current can flow through Rpu to load, so Rpu can not offset leakage current, but make it worse.

If Rpu is added, one more leakage path from Vbat to GND through Load is added. And during channel off, Vout will go higher(more current go through load) -> VDS=VS-Vout will be lower. this will result in Vds under channel off state getting closer to Vds under open load state.

  • 0
    TI__Genius 16390 points

    Hi Fei,

    You can think of this way. If you don't have an external pull-up resistor, and consider there are leakage path from VS to VOUT and VOUT to GND internal to the device. If the VS to VOUT impedance is 1MOhm, and VOUT to GND impedance is 1MOhm, then the VOUT voltage will be VS/2. If it's some other ratio, it will be an undefined voltage.

    With the external pull-up (much stronger than the internal leakage path), the VOUT can be pull-up to a defined voltage (very close to VS), and enables the open-load detection for the part.

    Hope this clarifies.

    Regards,

    Yichi