SNVSBJ0A December 2019 – June 2020 LM5170
A dedicated comparator monitors the LV-Port voltage through a resistor divider. The divider consists of the internal 1-MegΩ pullup resistor between the CSB1 and OVPB pins, and an external pulldown resistor between the OVPB pin and AGND. When the OVPB pin voltage exceeds the 1.185-V threshold, both HOs and LOs are turned off. At the same time the SS capacitor is discharged, preparing to restart through soft start when the OV alarm is removed. See the Soft Start section for details.
Note the hysteresis voltage of both OVPA and OVPB comparators is approximately 100 mV. There are 5-µs built-in glitch filters for both OVPA and OVPB comparators. In addition, a small capacitor can be considered to place from the OVP pins to AGND. All these will help prevent errant operation by possible noises on the OVPA and OVPB signals.