[FAQ] BQ25792: Why does the SYS output of the evaluation module (EVM) collapse when no battery (or battery simulator) is attached to the BAT pins?

The EVMs are configured to simulate working with a battery with a thermistor.  When the battery is removed but the simulated thermistor is still present, the charger continues to change the BAT as a battery is present. The charger tries to charge the battery causing an over voltage protection (OVP) event.  The OVP event causes the converter to temporarily turn off, in an effort to protect the system, resulting in SYS collapsing. To prevent the SYS voltage from collapsing when the battery is removed or is not present, remove its thermistor earlier or at the same time as battery removal or disable the simulated thermistor on the EVM using the headers and shunts.  Alternatively, the host can disable charging when the battery is not present.