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Original question:

TPS61175: Power Delivery Issue

TPS61175: TPS61175

Hafiz Rizwan Waheed
Prodigy 60 points
Part Number: TPS61175

Tool/software:

Hi Team,

We have been using TPS61175 in our design of high-speed PCB. We are using TPS61175 for Reverse Wireless charging through our device. We are facing quite a strange problem with TPS61175 enable pin. We are connecting it to GPIO and sending signal through SOM for enabling it, it gets enabled and provides 9V desired output to the system but does not provide enough power to IC to enable Wireless Charging. But when we provide 4V directly to enable pin by shorting it with Vin, everything works fine and Wireless Charging gets enabled. Is there any factor of driving strength in GPIO signal? We need your assistance with this.

Please provide response as soon as possible.

Best Regards,
Hafiz Rizwan Waheed.

  • 0
    TI__Genius 16295 points

    Hi Hafiz,

    Sorry, I'm a little confused about the description.

    When EN pin is connected to GPIO of MCU, the output is desired 9V, but it is not powerful enough to the wireless charging?

    Does that mean the current is limited and the voltage drops when adding some load?

    When EN is connected to Vin, the output is still 9V and the current is larger?

    When normal working, the output power is only limited by its peak current limitation.

    The device's current will not be influenced by external setting.

    For EN pin it has an inner pull down resistor of 800kohm typical.

    I guess something other changes between the two situations.

    Could you double check this and looking forward to your reply.

    Best Regards,

    Fergus