Other Parts Discussed in Thread: BQ500215,
Dear,
I'm currently trouble shooting an implementation of a colleague of mine but I'm a bit out of options at the moment. The design comprises a wireless power transmitter based on the BQ500215 and a receiver based on the BQ51025. Together these should be able to transfer 10 watts of power. We implemented it into a dedicated system so interoperabiliteit / interchangeability is not of a concern.
The problem I currently observe is that in 60-70% of the times placing the receiver on the transmitter, in starts as expected but only in low-power mode (PMODE pin is high, transmitter LED is blinking slow). When increasing the load beyond 5 watt the current limit comes in as expected. The rest of the times the receiver enters proprietary mode (PMODE pin remains low, transmitter LED is blinking fast) and the full 10 watt can be used.
What we tried so far:
- Checking all voltage levels and wave forms.
- Tune receivers resonant tank as explained in the datasheet.
Everything seems to be correct, but the behavior described above stays the same. Any ideas where to start?