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UC3879 引用外部时钟问题

Other Parts Discussed in Thread: UC3879

各位专家:

          下午好!我现在用UC3879做动态频率跟踪电源,该芯片CLKSYNC端需要接受外来的时钟,我将RT拆除(解除芯片自身震荡时钟),发现19脚RAMP无斜坡信号,导致无法移相操作,请给位给点建议!如何在外接时钟下能移相控制?谢谢!