Creating the V_CORE compensation network

This application note relates how to design an effective compensation network for the V_CORE error amplifiers of the MC33907 and MC33908. The V_CORE Regulator integrated inside these System Basis Chips is a non-synchronous voltage mode buck regulator. It generates the microcontroller core supply voltage. This voltage is adjusted using an external voltage divider in the range of 0.9V to 5V.

As with any switch-mode DC/DC converter, the V_CORE Regulator needs a compensation network for stabilising the converter. It is necessary for compensating the gain and phase shift caused by the output filter of the buck regulator. Only with proper compensation can the buck converter react fast enough to load steps without falling into an unstable mode.

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Originally published by Freescale Semiconductor at www.freescale.com as "Designing the V_CORE Compensation Network".