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ucc28740开关频率怎么调大?

Other Parts Discussed in Thread: UCC28740

Hi ,

目前我设计的UCC28740,啸叫声较大,测试发现轻载时开关频率在10khz一下,满载时在30Khz左右且占空比很小(远不到10%)。请问该怎么调大开关频率从而减小啸叫?

谢谢!