What Compensator Type Should I Select?

Type II Analog and Digital 2-Pole/ 2-Zero (2P2Z) Converter

These converter types are required when the Phase boost is less than 90o and the System-Plant dominant pole is of determined to be of the first-order. For example, in the case of a current mode buck converter, where the dominant system pole is a function of the load resistance times the output capacitance.

Type III Analog and Digital 3-Pole/ 3-Zero (3P3Z) Converter

These converter types are required when the Phase boost is between 90o and <180o or when the System-Plant dominant pole is determined to be of the second-order. For example, in the case of a Voltage-Mode Buck converter, where the dominant system pole is a function of the output inductor and the output capacitance.

Proportional Integral Derivative (PID) Converter

This converter is considered to be an excellent compensator for different applications and it involves the tuning of three specific parameters Kp, Ki, Kd gain terms. These gains are used to modify the Phase boost and Gain margins of the loop-gain (closed-loop). This compensator allows you to configure the placement of the compensator origin pole and two zeros.

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Compensator coefficients are computed based on specific hardware configuration settings. If these hardware settings change, you must recalculate the compensator coefficients.

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