DC-DC Converter Protection Circuit and Protection Method Thereof

A protection circuit of a DC-DC converter, the DC-DC converter comprising an input terminal, an output terminal, and an output stage, the input terminal receiving an input voltage and the output terminal providing an output voltage, the output stage being disposed between the input terminal and the output terminal, the protection circuit comprising:

• a current sensor, coupled to at least one circuit unit of the output stage and providing a sensing signal;
• a first comparator, coupled to the current sensor and comparing a default over-voltage with the sensing signal to provide an over-current control signal;
• a determining circuit, providing a determining control signal;
• and
• a protection control circuit, coupled to the determining circuit and the first comparator and determining whether to enable a short protection according to the over-current control signal and the determining control signal.