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LM5116: SW、HO、LO波形异常,带载很差,一加负载输出电压就大幅下降,想知道问题出在哪里

Part Number: LM5116

24V输入,-32V输出,原理图参考了TI Power Designer设计工具,SW、HO、LO波形异常,带载很差,一加负载输出电压就大幅下降,想知道问题出在哪里

原理图: ,之前电感为47uH,但是板子空载没有输出,怀疑可能是饱和电流问题,因此换了一个22uH电感,这个电感饱和电流更大,空载输出-32V,原理图中的D2、R10、C18、C17在板子没有焊接,C20、R11和R12也没有焊接,在板子上短路了R11和R12,R5修改为18k,C4修改为3.3nF,C5修改为100pF

PCB:PCB顶层 ,内层1:

,内层2: ,底层:

SW引脚波形: ,HO引脚波形: ,LO引脚波形: