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Figure 5. Because these protection circuits are fully inte- grated inside the IC without external components, the reliability is improved without increasing cost. Once a fault condition occurs, switching is terminated and the Sense FET remains off. This causes Vcc to fall. In this manner, the auto-restart can alternately enable and disable the switching of the power Sense FET until the fault condition is eliminated.
In this situation, the protection circuit should be activated in order to protect the SMPS. In order to avoid this undesired operation, the OLP circuit is designed to be activated after a specified time to determine whether it is a transient situation or an overload situation.
In conjunction with the Ipk current limit pin if used the cur- rent mode feedback path would limit the current in the Sense FET when the maximum PWM duty cycle is attained.
If the output consumes more than this maximum power, the output voltage Vo decreases below its rating voltage. This reduces the current through the opto-coupler LED, which also reduces the opto-coupler transistor current, thus increasing the feedback voltage VFB. In this condition, VFB increases until it reaches 6V, when the switching opera- tion is terminated as shown in Figure 6. The shutdown delay time is the time required to charge Cfb from 3V to 6V with 5uA current source.
DMO265R Datasheet PDF - Fairchild Semiconductor
DMO265R DATASHEET PDF