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BQ51050B: RX loop antenna

Part Number: BQ51050B
Other Parts Discussed in Thread: TIDA-00318

Hi i am working on a low power application.. and it is a small device... I ordered a wireless loop RX coil for my BQ51050 which is small in size that matches my board and size of my product, but the RX loop that arrived with 8.3 uH inductance and the DC resistance of 950mOhm which yield a  Q-Factor of which is less than 77 which is not recommended....  and the charging is not happening as intented........ is it he RX loop that could be the issue  or is there any other issue in my cirucit.... i am posting my circuit schematic as well in this post... 

Hi i am working on a low power application.. and it is a small device... I ordered a wireless loop RX coil for my BQ51050 which is small in size that matches my board and size of my product, but the RX loop that arrived with 8.3 uH inductance and the DC resistance of 950mOhm which yield a  Q-Factor of which is less than 77 which is not recommended....  and the charging is not happening as intented........ is it he RX loop that could be the issue  or is there any other issue in my cirucit.... i am posting my circuit schematic as well in this post... 

  • I would need more info on the RX coil. As a general rule as the coil gets smaller the inductance value needs to go up, for 22mm diameter coil a value of 27uH would be good. See TIDA-00318 and TIDA-00329.
    The value of 8.3uH looks low. Take a look at voltage at RECT pin it must be greater than 2.7V during digital ping for the unit to start.