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LM5116: 实测驱动波形的频率只有设定频率的一半

Part Number: LM5116


用LM5116搭建一个38V转10/3A的DCDC电路。通过电阻设定运行频率为250KHz,实测HO、LO的驱动频率只有125KHz。只有设定频率的一半。请问下这是什么原因