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https://e2e.ti.com/support/power-management-group/power-management/f/power-management-forum/685514/uc3863-frequency-change-automaticlly
1.实际实验输出频率为何与设计参数的值不一致？
2.实验的输出频率有时会改变，例如，当只有控制部件电源被添加到控制板时，UC3863的输出频率为250K， 当将主电源输入添加到电路中的某个电压(例如80V)时、频率会自动变为290K、并且在移除主电源输入后、频率仍为290K。原因。
UC3863用于半桥 LLC 的开环控制
