There are three levels of OCP:
- OCP1: peak current protection (highest threshold)
- Fault action: If ISNS is higher than OCP1 threshold for 4 consecutive switching cycles, the switching will stop. The system enters FAULT state, and waits for 1 s and then re-enters the startup state.
- OCP2: average input current protection (high threshold)
- Fault action: If sensed ISNS average value is above the threshold for 2 ms, the switching will stop. The system enters FAULT state, and waits for 1 s and then re-enters the startup state.
- OCP3: average input current protection (low threshold)
- Fault action: If sensed ISNS average value is above the threshold for 50 ms, the switching will stop. The system enters FAULT state, and waits for 1 s and then re-enters the startup state.
The circuit block diagram has been discussed in the Section 7.3.5 section.