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BQ24725A Latch Off Issue

Other Parts Discussed in Thread: BQ24725A

Dear Sir 

Our BQ24725A design as below 

We find BQ24725A will be latch off when the low battery voltage and turn-on the charger

If we turn-off the high side MOSFET protection by register and than this issue could be solved

But I don't have any idea about reason ,as I know my BTST cap used wrong volume ,could you kindly share more experience about this latch off issue  ( I don't wont to turn off high side protection)

Thanks

  • Please check the datasheet P38, "The high-side FET short is detected by monitoring the voltage drop between ACP and PHASE. As a result, it not only monitors the high side switch voltage drop, but also the adapter sensing resistor voltage drop and PCB trace voltage drop from ACN terminal of RAC to charger high side switch drain. Usually, there is a long trance between input sensing resistor and charger converting input, a careful layout will minimize the trace effect."

    And, page 39 gives more detail info on the layout.

    BTST capacitor could also cause the issue because it is HIDRV's power source. If HIFET is not fully turned, the voltage across HIFET could be higher and trigger the HIDET short protection.