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BQ51050B: Charge distance problem

Part Number: BQ51050B

Dear TI,

The product structure is as follows. The product (lid) is located at the bottom of the coil.
The height between the coil and the surface after the position is 4.0mm.
It works well with the main charger, but the fast charger (Xiaomi, Samsung) is charged for about 5 seconds when it is installed as below, and charging stops.
Also, if you remove the appliance and put it on the charger immediately in the coil state, the charge will be good.
There is a problem depending on the distance. The distance of 4.0mm does not seem to be a long distance, so I would like to know if there is any part that we miss.
  • Hello BJ Han

    A couple of things to check:

    1.) This could be FOD triggering a fault, increase R24 to provide more margin.  Remove R20, can reinstall later.

    2.) Check the voltage at RECT to determine if start up is completing and voltage is converging on target.

    3.) Do you have a Qi Sniffer that can read info from RX to TX, do you seen EPT?