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BQ24725: BQ24725 cannot charge

Part Number: BQ24725

Hi all,

I have built a charger with BQ24725, circuit is identical to evm board, but my board only show response with resistor load. Charge current and voltage can be set with this setup.

When the resistor is replaced by real battery, the ACFET turn off immediately once initiating charging action by SMbus, charging cannot be started. It looks like protection triggered.

Is there any way to figure it out ?

Thanks!