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UCC20520同步降压启动瞬间输入电压过冲

Other Parts Discussed in Thread: UCC20520, UCC27211

我在用ucc20520设计同步降压电路,现在发现在给pwm信号的时候 输入电压会有很大幅度的毛刺, 波形见下图:

可以看到在给pwm信号的时刻, 输入电压会有很大的毛刺,请问怎么消除这个毛刺, 如果加稳压二极管的话可以么? 这个问题是不是同步降压的电感参数不对引起的?