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Tool/software:
Dears,
The customer used BQ25703 and found that the low side MOSFET would turn on, causing the battery to be pulled down to a protective state. The probability was originally very small, but later in order to control the input voltage to be greater than 12V before it can be turned on. The customer has added input voltage and current limiting circuits, which means that MQ2206 is turned off when the input voltage is below 12V, and only turn on when the input voltage is greater than the set voltage of 12V. When inserting and unplugging Type C twice in a row, there is a high probability that the second time will trigger the phenomenon of low side MOSFET turn on. May I ask when this phenomenon will occur? How to set it up to solve this problem? Thanks.
Hi,
Do you have a waveform to share? If this was a shot-through issue, you need to follow the EVM MOSFET selection.
Regards,
Tiger
Hi, Jon,
The input voltage() register means min input voltage to keep the charger operation. You can set the register to 0x00 to disable the input voltage regulation.
From the waveform, I could not see how VSW1 links to VBAT. There is FET and inductor, which may block the current flow.
I would suggest you monitoring the inductor current, or even trying the test on a TI EVM board.
Regards,
Tiger