When the FB pin, for some reason, has a voltage higher than 1 V applied, the device shuts down immediately. Both FETs are kept off. This is called overvoltage protection. For the TPS54200 device, this is a latched shutdown. Cycling VIN resets the device. For the TPS54201 device, a device shutdown starts the overvoltage auto-retry timer tHIC_OV. During the shutdown period, both FETs are kept off. Once the overvoltage auto-retry timer expires, the TPS54201 device restarts again. If the failure still exists, the TPS54201 device repeats the foregoing auto-retry shutdown-and-restart process.