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TPS4811-Q1: Reverse current protection

Ben
Intellectual 390 points
Part Number: TPS4811-Q1

Tool/software:

Hello TI team,

In case of the Motor driver system supplying from load switch TPS48111.

As the motor generates energy through regenerative braking or free-wheeling, the energy sent through a load switch to the battery.

I think, if INP is holding high at that time, the regenerative energy can be pass back to back FET to the battery.

TPS48111 sense output current by shunt resistor(R_SNS), If shunt resistor detect reverse current level, does it okay?

Thank you.

  • +1
    TI__Expert 8100 points

    Hi Ben, 

    Yes If INP is HIGH then the reverse current can flow to the battery for charging. The important thing is that no min/max specs are violated. If you have any negative voltage for example you need to place TVS diodes on the input and output. You can find this description in section "9.4 Power Supply Recommendations". 

    The device cannot detect reverse current and forward current at the same time. In other words the topology you choose will determine if current protections exist  in the forward direction (as show in the datasheet) or in the reverse. In this way the device will not react to reverse current. 

    If you need the capability for both directions you can consider a device like TPS4812, which has the TPS1211 features in addition to bi directional current sense capabilities. 

    https://www.ti.com/lit/ds/symlink/tps4812-q1.pdf?ts=1738876353119&ref_url=https%253A%252F%252Fwww.ti.com%252Fproduct%252FTPS4812-Q1

    Thank you, 

    Sarah