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(UCC28711)用于电机驱动器的 400V 到 690V 交流输入 50W 隔离式反激电源参考设计

你好,请问将《用于电机驱动器的 400V 690V 交流输入 50W 隔离式反激电源参考设计》中的启动电压改变,变成200V启动,是重新计算公式15,RS1为50.1kΩ(RS2相应改动了),然后HV启动引脚上的电阻只留下一个,为什么启动电压是220V呢?