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PMP20795:辅助绕组Naux的电容

Other Parts Discussed in Thread: PMP20795

TI设计PMP20795的电路图中,辅助绕组Naux的功能应该就是反馈电压给IC吧?

这里电容C616的容量是100uF。

为了减小元件的尺寸,可否改用更小容量的电容如22uF、33uF?

或者能否不要这个电容,只用旁边的D604?