Zero gain crossover frequency (SMPS)

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gain crossover frequency

Hello, In a switch mode power supply, should the zero gain crossover frequency be set...

1. At one fifth of the swithcing frequency or less ?....or...
2. At a frequency less than the output filters corner frequency?
 

smps crossover frequency

It should be set at 1/10 to 1/20th of the switching frequency but this is only a practical rule. The corner (resonant) frequency of the filter is usually in the 1-5 kHz range. So if the switching frequency is 200 kHz, you can choose your crossover frequency at 10 kHz. However, you might want to go lower to achieve higher phase margin or go a little higher if you want faster transient response.

\[v_c\]
 

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