Non-transformer isolated dc-dc power supply including shut down circuit

A direct current-to-direct current (DC-DC) power supply, comprising:

• a voltage converter module including an input that receives a first voltage having a first voltage level and an output that provides a second voltage having a second voltage level that is less than the first voltage level;
• an over-voltage detection module configured to receive the second voltage from the voltage converter module and to generate an over-voltage signal indicating an over-voltage condition of the DC-DC power supply based on the second voltage;
• a shutdown module configured to receive the over-voltage signal and to generate a shutdown signal in response to the over-voltage condition;
• and
• an over-voltage protection module interposed between the shutdown module and the input of the voltage converter module, the over-voltage protection module configured to selectively inhibit delivery of the input voltage to the voltage converter module in response to the shutdown signal.