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Demystifying Type II and Type III Compensators Using Op ...

Application Report SLVA662 July 2014 1 Demystifying Type II and Type III Compensators Using Op-Amp and OTA for DC/DC Converters SW Lee Power Management ABSTRACT The error amplifier for frequency compensation can be a simple voltage-to-voltage amplification device, that is, the traditional Op-Amp. This type of Op-Amp requires local feedback (between its output and inputs) to make it stable. And also, the error amplifier can be a voltage-to-current amplification device, that is, the gm Op-Amp (Operational Transconductance Amplifier, OTA).

The biggest change compared to the conventional Op-Amp approach is the divider network and the OTA g. m. parameter now enters into the equations. Regarding the divider network in the Op-Amp case; thanks to the virtual ground effect, both pins were at a similar potential and the ac contribution of the lower resistor (R. 4) was nonexistent.

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