Feedback circuit and control circuit for lamp load

A feedback circuit for a lamp load, connected to a drive circuit of the lamp load, the drive circuit comprising a non-dimming chip, a semiconductor switching device and a sampling resistor, the semiconductor switching device comprising a gate, a source and a drain;

• the drain of the semiconductor switching device is connected to a negative terminal of the lamp load, and a positive terminal of the lamp load is connected to a power input terminal;
• the sampling resistor is connected between the source of the semiconductor switching device and the ground;
• and the non-dimming chip comprises a first output terminal and a voltage feedback terminal, the first output terminal is connected to the gate of the semiconductor switching device, wherein the feedback circuit comprises:
• a first voltage-dividing resistor and a second voltage-dividing resistor, wherein a first end of the first voltage-dividing resistor is connected to the power input terminal, a second end of the first voltage-dividing resistor is connected to the positive terminal of the lamp load, and a first end of the second voltage-dividing resistor is connected to the drain of the semiconductor switching device, and a second end of the second voltage-dividing resistor is connected to the source of the semiconductor switching device,
• wherein the voltage feedback terminal is connected to the second end of the first voltage-dividing resistor.