Hello,
I am using bq51051byfpr as power receiver with a 6uH antenna (Wurth's 760308105214).
The transmitter is QI compliant.
I tried to size the capacitors following the equations I found in the datasheet of the receiver and this is what I got:
C1-series=422 nF
C2-parallel=4.2 nF
I am attaching the schematic.
The problem is that apparently the transmitter does not identify the receiver, so the power transfer never starts, I only see a signal coming and stopping several times, as follows.
This is what I get from an oscilloscope, analyzing pins P8 and P9 of the schematic:
The main frequency seems to be about 170 kHz. The signal is sent several times but never stabilizes to a continuous transmission.
May you help finding the mistake in the design?
Thank you in advance,
Ilaria
