SNVSC22A October 2023 – March 2024 LM51772
ADVANCE INFORMATION
This feature shall avoid any damage to the device in case the ext. feedback pin is not working properly i.e is shorted
The over voltage protection is realized by the converter core and reference system. The device main logic only monitors the OVP 2 function the converter logic will take an appropriate measure (e.g. emergency skip mode) to avoid a further increase of the output voltage.
If the output voltage threshold VT+(OVP2) is reach on the VOUT-pin the buck-boost core logic disables the converter power stage and enters a high impedance state at the switch nodes. If the output voltage falls back under this threshold the convert operation is resumed
Due to wide recommended operation range, the OVP2 protection of lower Vo application is limited. Therefore the OVP2 threshold is programmable by the V_OVP2 register field.
For power savings e.g. in burst mode or uSleep the OVP2 circuit can be turned off. In this case it need to be ensured that a fault on the feedback or any other mechanism enter- re-enter sleep will not impact the correct function of OVP