Over-voltage clamp circuit

A clamp circuit, comprising:

• an output transistor device that includes a control terminal, an input terminal, and an output terminal;
• a current sensor coupled with the output terminal of the output transistor device;
• a current source coupled to the current sensor;
• a divider circuit coupled in parallel with the current source;
• a mirror transistor device coupled in series with the current source and the divider circuit, the mirror transistor device including a control terminal that is coupled with the control terminal of the output transistor device;
• and
• a gate control circuit having an input coupled to an intermediate node of the divider circuit.

A clamp system, comprising:

• a mirror circuit configured to control an output voltage of an output node of the clamp system in response to a control signal and an input voltage;
• a current sensor configured to provide a current sensor signal based on an output current of the output node;
• a current source configured to generate scaled current in response to the current sensor signal, wherein the mirror circuit is configured to provide a feedback signal representing the output voltage based on scaled current of the current source;
• a sample network configured to sample the feedback signal and to set a clamping threshold;
• and
• a controller configured to generate the control signal in response to the sampled feedback signal, the controller configured to clamp the output voltage of the output node via the control signal in response to the output voltage exceeding the clamping threshold.