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Creating the VCORE compensation network

Posted: 03 Dec 2013     Print Version  Bookmark and Share

Keywords:compensation network  error amplifier  MC33907  MC33908  DC/DC converter 

This application note relates how to design an effective compensation network for the VCORE error amplifiers of the MC33907 and MC33908. The VCORE 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 VCORE 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.

View the PDF document for more information.

Originally published by Freescale Semiconductor at as "Designing the VCORE Compensation Network".

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