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EN/SS control of several TPS56121

K. Sasaki14
Guru 10200 points
Other Parts Discussed in Thread: TPS56121

Is it possible to control sequence in condition that EN/SS pin of several TPS56121 are connected?

  • 0
    TI__Genius 17240 points

    Hi Sasaki-san,

    The EN/SS pins of several TPS56121 should not be connected together directly. In Figure 19 of the datasheet, you can see the profile on EN/SS pin. After the initial calibration time, the EN/SS voltage needs to be pulled below 0.4V to start the PWM switching. But from part to part, the calibration time could be slightly different. If on one part, the EN/SS is being pulled low while other parts' EN/SS is charged up, there will be some interference between those parts and affecting the soft-start.

    One solution is to use an open-drain switch to connect to the EN/SS pin for enable/disable. All the open-drain switches for several TPS56121 can be controlled by a single control signal.

    Regards,

    Na