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关于TPS40193开关频率如何设置。反馈电路参数配置

Other Parts Discussed in Thread: TPS40193

j近期用TPS40193芯片做了一个电源转换模块,按照经典电路可以输出1.8V,但是用示波器测量SW端的时候发现频率只有2点多KHZ,波形也不稳定。搞了很久都不知道什么问题?想请教一下社区大牛,我这情况问题出在哪里?期待大家指导。