The LM73100 allows the user to implement overvoltage lockout to protect the load from input overvoltage conditions. The OVLO comparator on the OVLO pin allows the overvoltage protection threshold to be adjusted to a user defined value. Once the voltage at the OVLO pin crosses the OVLO rising threshold V_OV(R), the device turns off the power to the output. Thereafter, the devices wait for the voltage at the OVLO pin to fall below the OVLO falling threshold V_OV(F) before the output power is turned ON again. The rising and falling thresholds are slightly different to provide hysterisis. The Figure 7-2 and Equation 2 below show how a resistor divider can be used to set the OVLO set point for a given input supply voltage.

Figure 7-2 Adjustable Overvoltage Protection

Equation 2.

While recovering from an overvoltage event, the LM73100 starts up with inrush control (dVdt).

Figure 7-3 LM73100 Overvoltage Lockout and Recovery