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bq500212A / difference of A5 and A11, efficiency

Guru 20090 points
Other Parts Discussed in Thread: BQ500412, BQ500212A

Hello,

I have two questions about wireless charger.

(1) Transmitter coil of 5V
Could you please let me know the difference of A5 and A11 ?
I checked WE Homepage. However I couldn't understood the difference.
http://katalog.we-online.de/en/pbs/WE-WPCC_Transmitter?sid=25557f794a#vs_t2:2

(2) Efficiency
Are there difference of efficiency between 5V system and 12V system ?
Also I would like to know the efficiency difference between 5V system and 12Vsystem.
I could find the efficiency graph in datasheet ofbq500212A and bq500412.
Then these efficiency graphs are exactly the same.

Best Regards,
Ryuji Asaka


  • (1) Transmitter coil of 5V
    Could you please let me know the difference of A5 and A11 ?----BJ-The only difference between A5 and A11 is the magnet used for positioning aid.  The A5 has a magnet in the center and A11 has none.  The magnet did not work well as a centering aid due to weight of the phone.  It also increases the risk of saturation of RX coils with thin shields. 
    Most new TX designs do not use the A5.

    (2) Efficiency
    Are there difference of efficiency between 5V system and 12V system ?---BJ—Efficiency for bq500212A (5V input) and bq500412 (12V input) are about the same.  As you noted the graph are available in the data sheet. 
    A more detail graph of the Efficiency is available in the EVM User’s Guide for each device.