Feedback control apparatus

A feedback control apparatus comprising:

• a detector configured to detect an output value based on a controlled object;
• a P control circuit comprising a discrete differential amplifier circuit and a discrete analog circuit, the discrete differential amplifier circuit being configured to receive a detection value of the detector and a target value, the discrete analog circuit being configured to output a P control component VP to an output of the discrete differential amplifier circuit, the discrete differential amplifier circuit and the discrete analog circuit being separate circuits;
• an I control section configured to output an I control component VI by integrating a deviation of the detection value from the target value by digital processing;
• an analog adder circuit for adding the P control component VP from the P control circuit and the I control component VI from the I control section, the analog adder circuit is such that the output of the discrete differential amplifier circuit and the I control component VI are added to each other therein;
• and
• a driver element configured to be driven based on the output of the analog adder circuit to control the controlled object.