Patent ID: 7929266

Claim:
An electronic device comprising: a signal reference module having an output terminal, wherein the output terminal is configured to provide a reference signal; and a feedback control module having a first input terminal, a second input terminal, and an output terminal, wherein: the first input terminal of the feedback control module is coupled to the output terminal of the signal reference module to receive the reference signal; the second input terminal of the feedback control module is configured to receive a signal corresponding to a scaled signal based upon a signal at a current carrying terminal of a power transistor; the feedback control module is configured to provide: an output signal in a first state when the scaled signal is less than a threshold signal; or the output signal in a second state when the scaled signal at least the threshold signal; the output terminal of the feedback control module is configured to be coupled to a control electrode of the power transistor; the feedback control module comprises: a first measurement module having a first input terminal, a second input terminal, an output terminal, wherein: the first input terminal of the first measurement module is coupled to the output terminal of the signal reference module to receive the reference signal that is a reference voltage; the second input terminal of the first measurement module is configured to receive the scaled signal that corresponds to a fraction of a voltage difference between current carrying terminals of the power transistor; and the output terminal is configured to provide an output signal in a third state or a fourth state, wherein: the third state corresponds to the reference voltage being greater than a second input signal on the second input terminal; and the fourth state corresponds to the reference voltage being less than the second input signal on the second input terminal; and a control signal drive module having an input terminal and an output terminal, wherein: the input terminal of the control signal drive module is coupled to the output terminal of the first measurement module; the control signal drive module is configured to provide an output signal in the first state or the second state, wherein: the first state being in response to the output signal from the first measurement module being in the third state; and the second state being in response to the output signal from the first measurement module being in the fourth state; and the output input terminal of the control signal drive module is configured to be coupled to the control electrode of the power transistor.