VOLTAGE CONVERTER COMPENSATION APPARATUS AND METHODS

摘要

In described examples, a voltage converter (200) generates an output voltage (V_OUT). A sense circuit (243) generates a sense signal (V_SENSE) proportional to the output voltage (V_OUT). A regulation feedback controller (255) determines a difference between the sense signal (V_SENSE) and a reference voltage (V_REF), and generates a negative feedback control signal that causes a pulse width modulation ("PWM") regulation controller (219) to drive the output voltage (V_OUT) closer to a set-point determined by the reference voltage (V_REF). A voltage divider (280) is coupled to a secondary winding (223) of a flyback transformer (216) to increase the reference voltage (V_REF) in proportion to a magnitude of current flow at the output of the converter (200) and to increase the set-point to compensate for a voltage drop between the converter (200) and a device powered by the converter (200).