A power device controller includes a voltage mode control loop to generate
an error voltage and to control a power device and a current mode control
loop to generate a current control voltage and to control the power
device. The current mode control loop includes a current feed-forward to
reduce a load dependence of a loop gain by reducing a load current
dependence of a low frequency component of a gain of the error voltage to
the output voltage with a current loop closed. A multi-phase power device
controller for controlling several power devices includes a shared
voltage mode control loop to generate an error voltage and a shared
current mode control loop to generate a current control voltage, the
shared current mode control loop including a current feed-forward to
reduce a load current dependence of a low frequency component of a loop
gain.