Other Parts Discussed in Thread: BQ51221
Hi team,
Can you explain when OVP EPT is issued in BQ51020or the condition? According to a customer, the transmitter is intermittenly received during charging process.
Thanks,
Best Regards,
Sam Lee
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Hello Sam
The bq51020 will set the OVP fault when Voltage at RECT is 15.V ( 14.6V to 15.6V range). At that point the bq51020 will send EPT04 (End Power Transfer 04) and turn on (ground) CLAMP1 & 2 pins to reduce voltage. The TX will turn off when EPT04 is received. TI TX will restart after about 40mS.
The cause of OVP could be a RX coil or tuning of the RX coil. The problem would probably occur during a high load to light load condition, system cannot change operating point quickly enough to reduce voltage and trips OVP.