How to exit capacitor compensation cabinet mode

What is the purpose of a compensation capacitor?

Objective of compensation is to achieve stable operation when negative feedback is applied around the op amp. Miller - Use of a capacitor feeding back around a high-gain, inverting stage. Miller capacitor only Miller capacitor with an unity-gain buffer to block the forward path through the compensation capacitor. Can eliminate the RHP zero.

Which capacitance should be used in a compensator design?

It should be noted here that the value of the capacitance used in the compensator design must be the small signal value. Ceramic capacitors lose some portion of their capacitance as their biasing voltage increases. The MLCC capacitors which are used in this example have 22μF nominal capacitance.

How does a capacitor affect a transient response?

Increasing the value of the capacitor increases the cost and increasing the value of the inductor can decrease the efficiency and can make the transient response slower. On the other hand, the output voltage ripple can be decreased by increasing the switching frequency.

What happens if MLCC capacitors are used at the output side?

Condition (38) happens when MLCC capacitors are used at the output side of the converter. Sometimes, using POS-Cap or SP-Cap types of capacitors results in a type III-B system as well. If this happens, the poles and zeros of the compensator will be placed as follows: (39) 0 ). The following formulas can be used to locate (40) (41)

How do you calculate a capacitor's life span?

The capacitors' life span is calculated by extrapolating the results of an ageing test. The IEC 61049 standard serves as the reference. The following calculation method is used: The ageing test involves submitting the capacitor to a test voltage greater than the rated voltage for a given period of time at the maximum operating temperature.

Do ceramic capacitors lose capacitance when biasing voltage increases?

Ceramic capacitors lose some portion of their capacitance as their biasing voltage increases. The MLCC capacitors which are used in this example have 22μF nominal capacitance. However, at the biasing voltage and 600kHz their capacitance drops to about 10.8μF. It is this value that must be used for all computations related to the compensation.