The UC1826 family of average current mode controllers accurately accomplishes secondary side average current mode control. The secondary side output voltage is regulated by sensing the output voltage and differentially sensing the AC switching current. The sensed output voltage drives a voltage error amplifier. The AC switching current, monitored by a current sense resistor, drives a high bandwidth, low offset current error amplifier. The output of the voltage error amplifier can be used to drive the current amplifier which filters the measured inductor current. Fast transient response is accomplished by utilizing voltage feedforward in generating the PWM ramp.