Figure 7-1 depicts the device V_ISO regulation behavior across the output load range, including when the output is overloaded. For proper device operation, ensure that the device VISO output load does not exceed the maximum output current (I_{OUT_MAX}). The value for I_{OUT_MAX} over different temperature and V_INP conditions are shown from Figure 6-8 to Figure 6-11. The following protection mechanisms will be engaged if the UCC12040 is loaded beyond the recommended operating area:

1. The device limits the maximum output power. If a load exceeding I_{OUT_MAX} is applied, V_ISO drops accordingly to meet the maximum power limit.
2. If V_ISO drops below nominal 3.8 V while operating in the constant power limit region, the over-power fold-back feature will switch the power converter from active rectification to passive rectification, and the built-in recovery hysteresis will ensure the UCC12040 recovers at a lower output power. The device returns to active rectification when load drops and V_ISO increases above nominal 4.3V.
3. The device triggers a soft-start reset if V_ISO drops below the nominal 1.8-V threshold. This reset is designed to protect the device during V_ISO short-circuit conditions.
4. Thermal shutdown protection disables the converter if the device is operated in any of the above regions long enough to raise the silicon junction temperature above the thermal shutdown threshold. See the Section 7.3.4 section for more details on this device feature.

Figure 7-1 V_ISO Load Recommended Operating Area Description