Feedback circuit for non-isolated power converter

A power converter, comprising:

• a feedback circuit comprising:
• a sense circuit coupled to receive an output current of a power converter;
• and
• a voltage-to-current converter operable to output a feedback signal representative of the output current of the power converter, the voltage-to-current converter comprising a shunt regulator coupled to the sense circuit, wherein a voltage across the shunt regulator changes in response to a change in a voltage across the sense circuit, and wherein the feedback signal changes in response to a change in the voltage across the shunt regulator;
• and
• a controller coupled to receive the feedback signal from the feedback circuitry, wherein the controller is operable to control the output current based at least in part on the feedback signal.

An apparatus, comprising:

• a light-emitting diode;
• and
• a power converter coupled to the light-emitting diode to provide an output current to the light-emitting diode, wherein the power converter comprises:
• a feedback circuit comprising:
• a sense circuit coupled to receive an output current of a power converter;
• and
• a voltage-to-current converter operable to output a feedback signal representative of the output current of the power converter, the voltage-to-current converter comprising a shunt regulator coupled to the sense circuit, wherein a voltage across the shunt regulator changes in response to a change in a voltage across the sense circuit, and wherein the feedback signal changes in response to a change in the voltage across the shunt regulator;
• and
• a controller coupled to receive the feedback signal from the feedback circuitry, wherein the controller is operable to control the output current based at least in part on the feedback signal.