If you need a very high crossover frequency above 15 kHz or so in order to reduce component size on a high frequency, high density converter, you will probably need some additional high-performance components for the feedback amplifier. Remember, crossover frequency is not an objective or specification of the power supply. The important quantities are output impedance and line rejection which determine the step load response of the converter, and the input noise rejection. Loop Gain Measurement Releasing a power supply to production without a comprehensive set of loop gain measurements is poor engineering practice. This measurement is as important as checking the peak voltage stress on the power switches with an oscilloscope.
Many companies continue to design and release power supplies without a loop gain measurement.
And many power supplies in the field oscillate and fail. Don't fall into this trap, modern equipment makes it inexpensive, easy and quick to verify loop gains. A couple of days extra work in characterizing and optimizing the control loop is much better than stopping the production line or losing a valued customer. The existing models are theoretically sound, but they often do not take into account circuit parasitics, especially in multi-output converters.