Hi Sir/ Madam
Please help to review the circuit.
I have few questions.
Please help to solve the issues
1. There is an 'A' letter inside my circuit. If the resistor is 121K, the inductor is 2.2uH and this pin isn't connected to any device, it can work properly?
2. See the letter 'B' inside my circuit. When the battery is full charged, the mosfet isn't turn off. Do you know why?
I measured Vg and Vd and Vs, and I got Vd = Vs and Vg is low.
3. We turn on the system, the NVDC starts to work.
The input voltage, ADPIN_T, is 12.44V.
The VSYS voltage, DCINP, is 6V~8.4V.
The battery voltage, UPSBAT, is 6V~7V because isn't full charged yet.
The bug is that charger stop bucking the input power to output, and battery starts discharging.
We can see the SYSOVP flag becomes high, but we cann't find VSYS is over 12V.
Why SYSOVP flag becomes high?
The temperature is 27 ℃ .
