Led driving circuit and led lighting circuit

A driving circuit for a light emitting source, comprising

• an input adapted to receive a power supply;
• a conversion circuit, adapted to convert the power supply and provide a converted power, comprising a power switch;
• an output, adapted to output the converted power;
• an output capacitor connected at the output;
• a first control circuit coupled to the output and connected to the power switch, adapted to sense a voltage corresponding to the voltage on the output capacitor and control the power switch operate in a power-reducing mode to reduce the converted power when the voltage corresponding to the voltage on the output capacitor sensed by the first control circuit exceeds a first level;
• and
• a second control circuit connected to the output capacitor and connected to a control terminal of the power switch, adapted to:
• sense a voltage at the output capacitor and
• electrically connect the output capacitor and the control terminal, and apply, between the control terminal and a current-out terminal of the power switch, a first portion of the voltage on the output capacitor which first portion being higher than a maximum rating voltage for the control terminal and the current-out terminal, so as to damage and make the power switch unoperational permanently, when the voltage at the output capacitor sensed by the second control circuit exceeds a second level.