Poles locating compensating

Locating the compensating poles and zeros in the error amplifier... 

The first compensating pole will be located at the capacitor s ESR frequency (4,020 Hz). 

Locate the compensating error amplifier pole at the lowest anticipated zero frequency caused by the ESR of the capacitor or... 

Locate the compensating error amplifier zero at the location of the lowest manifestation of the filter pole or... 

The more complicated methods of compensation, such as this, allow the designer much more control over the final closed-loop bode response of the system. The poles and zeros can be located independently of one another. Once their frequencies are chosen, the corresponding component values can be easily determined by the step-by-step procedure below. The zero and pole pairs can be kept together in pairs, or can be separated. The high-frequency pole pair appear to yield better results if they are separated and placed as below. The zero pair are usually kept together, but can be separated and placed either side of the output filter pole s corner frequency to help minimize the gain effects of the Q of the T-C filter (refer to Figure B-23). 

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