Transistors for overload delay

Posted on Jun 24, 2012

Transient overloads are not short circuits but can push the power supply above its nominal load value. This scenario occurs with typical loads such as printer heads and small motors. When facing such a load profile, the power supply can easily trigger its protection circuit, especially if the open-loop gain is high. You will see any decrease in the output voltage on the primary side as a loss of feedback current, because the controller cannot keep the voltage constant.

This circuit permanently monitors the feedback line (Pin 2) to detect whether a short circuit is present on the secondary side. If so, Pin 2 jumps to its internal pullup voltage and triggers a protective burst mode. Note that this protection acts independ

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