The controller circuits of both converters employ a fixed-frequency, multiple-feedforward controller topology. The circuits monitor input voltage, output voltage, and voltage drop across the switches. Changes in the operating conditions of the converters directly affect the duty cycle and must not take the indirect and slow way through the output voltage control loops. Measurement errors in this feedforward system are corrected by a self-learning control system. An external capacitor damps the output to avoid output-voltage steps due to output changes of this selflearning control system.

The voltage loops, determined by the error amplifiers, must only handle small signal errors. The error amplifiers feature internal compensation. Their inputs are the feedback voltages on the FBP and FBN pins. The device uses a comparison of these voltages with the internal reference voltage to generate an accurate and stable output voltage.