this is why most people use current mode as it removes the effect of the output inductor from the transfer function of the power stage - i.e. you are now controlling a current into a capacitor (& load). Unless you are extremely adept in designing voltage control loops - you will find that any attempt to control the converter faster than the output LC res freq will give you an unstable result (except for discontinuous operation at very light loads) Regards, Orson Cart.