Abstract: Provided is a feedback circuit and control circuit for a lamp load. The feedback circuit is connected to a drive circuit having a non-dimming chip, a semiconductor switching device and a sampling resistor, the semiconductor switching device has a gate, a source and drain connected to a negative terminal of the lamp load, the sampling resistor is connected between the source and the ground; and the chip includes a first output terminal and a voltage feedback terminal, the first output terminal is connected to the gate and the feedback circuit has a first voltage-dividing resistor and a second voltage-dividing resistor with a first end of the first voltage-dividing resistor connected to the negative terminal, a second end connected to a first end of the second voltage-dividing resistor, and a second end connected to the source and the voltage feedback terminal connected to the second end of the first voltage-dividing resistor.