Part Number: LM5013
问题请教：
Question for advice:
按照datasheet中的参数设计，设计VOUT=12V，FSW=300K；在VIN=48V时，输出正常，而VIN=24V时，SW出现双波，频率也和设计不同；为什么会出现低压输入的这种双波？
According to the parameters in the datasheet, the design specifies VOUT = 12V and FSW = 300K. When VIN = 48V, the output is normal, but when VIN = 24V, a double wave appears at SW, and the frequency also differs from the design. Why does this double wave occur under low input voltage?
参数选取：
Parameter selection from datasheet:
VIN=24V，VOUT=12V，load=1.25A，SW及IL出现如下波形，频率变成了设计值的一半：
VIN=24V，VOUT=12V，load=1.25A，SW and IL exhibit the following waveform, the frequency becomes half of the designed value：
VIN=48V，VOUT=12V，load=1.25A，SW及IL出现如下波形：
VIN=48V，VOUT=12V，load=1.25A，SW and IL exhibit the following waveform：
