• State Resolved
  • Locked Locked
  • Replies 2 replies
  • Subscribers 40 subscribers
  • Views 242 views
  • Users 0 members are here
Support feedback
Options
Options
Similar topics

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

TIDA-00623: Custom designed based on reference appears to work, but doesn't transfer power?

Timothy Sweeney-Fanelli
Prodigy 10 points
Part Number: TIDA-00623
Other Parts Discussed in Thread: BQ51051B

I have a custom PCB based on TIDA-00623 using same coil from the reference: WE 760308111, which was also recommended to me directly by WE to pair with the coil I use on my RX side. 

In initial testing, the implementation appears to function normally. It recognizes devices placed on the coil, the LED_A (using LED Control Option 1, 24.9kohm) blinks slow indicating power transfer, and I can measure just over 6VAC moving through the coil.

When placing my iPhone on the coil, it recognizes the charger and indicates "charging" however the battery continues to discharge. When placing my custom RX device based on BQ51051B on the coil, same behavior -- and I can see my custom charge status indicators on the RX side are unresponsive.

Anyone have any idea why TIDA-00623 based design would indicate power transfer but no power is received on the RX side, only apparently communication?

  • +1
    TI__Mastermind 19195 points

    Hello Timothy,

    This could be related to the FOD calibration. You can try increasing FOD_THR (FOF Threshold) to check. 

    Would be good to see scope capture of RX Rect waveform and the schematic.

    Thanks,

    Nick

  • 0
    Prodigy 10 points

    I think you’re right… for a quick test I shorted FOD_THR to 3v disabling FOD. Charger works well now.

    I’ll start with the low hanging fruit and verify my BOM. Won’t be surprised if one of the fod calibration or threshold resistors got placed incorrectly.

    Ill grab a fresh proto off the shelf and start on FOD Calibration and see about capturing the rx rect waveform.

    thanks