error amplifier การใช้

• An error amplifier is essentially what its name says, that is, it amplifies an error signal.
• The error amplifier compares the voltage at the middle point of the divider with the target value and adjusts the controlling current.
• An example of this kind of use would be a DC error amplifier used in a regulated power supply circuit feedback loop system.
• Simple linear regulators may only contain a Zener diode and a series resistor; more complicated regulators include separate stages of voltage reference, error amplifier and power pass element.
• Internal circuitry in the equipment monitors the actual current through the transistor / FET, compares it to a user-programmed desired current, and through an error amplifier changes the drive voltage to the transistor / FET to dynamically change its resistance.