7.3.5 Overvoltage Comparator

The voltage at the FB pin is compared to a 0.92-V internal reference. If the voltage rises above 0.92 V, the ON-time is immediately terminated. This condition is known as overvoltage protection (OVP). It can occur if the input voltage or the output load changes suddenly. Once the OVP is activated, the main MOSFET remains off until the voltage at the FB pin falls below 0.92 V. The synchronous MOSFET will stay on to discharge the inductor until the inductor current reduces to zero, and then switch off.