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UCC3895应用

Other Parts Discussed in Thread: UCC3895

我有个项目想要用UCC3895,我按资料的电路搭了起来,我用外部控制方式,外部输入频率在20-120K,工作频率是10-60K。搭好后测试,在外部输入频率后,显示2组互补的方波,没有移相,在外围元件不变的情况下,利于7,8脚的RC振荡频率,输出正常,有移相。我尝试在3脚输入相同频率的锯齿波,调节EAP还是没有移相。请问UCC3895用外部输入频率控制,IC的外围电路怎样接?应该注意哪些?