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problem in DCDC converter loop stability simulation

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Does SPICE simulation include the high order (high frequency) poles/zeros effect in converter system?
I have a boost converter system with variable load. I have compensated the loop with heavy load and the crossover frequency is about 15% of the switching frequency. Then I found when the load is light, the crossover frequency increases a lot, even equal or more than the switching frequency. I think the result is not correct because of the high order (high frequency) poles/zeros in converter system. But the simulation result in SPICE is still stable. Why?
Thanks!
 

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