bq500212A based transmitter issue

Mahesh Natu

Other Parts Discussed in Thread: BQ500412EVM-584

Hi,

I am working on Wireless Power , I have attached schematics & Gerber files of circuit, Reciever part is working fine ( that i have checked with Ti's EVM -- bq500412EVM-584 ) but transmitter is having issue ( i do not get any output on reciever OUT pin ) i am gettting around 90Khz on Tx coil terminals ,

I would appreciate if anyone can point out the mistake

Regards,

Mahesh

0535.et-wi-txrx-1.zip

over 9 years ago

0 Bill Johns over 9 years ago

TI__Guru 68796 points

I did not see any problems with the schematic.

Try changing the LED_MODE resistor to 48.7k, this will disable the external Sleep and Snooze ckt, will not have to worry about problems there. You should see the 3.3V stay up all the time. Also will see a digital ping at 175kHz every 500mS. This will be enough to power up the RX and it should reply.

See slide 8 of FAQ-bqTESLA TX Sleep Mode

http://e2e.ti.com/support/power_management/wireless_power/f/693/t/372430.aspx

The 3.3V LDO output plot does not apply. But TX coil Voltage and RX Vrect are valid.

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bq500212A based transmitter issue