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TPS62873-Q1: webench 仿真问题

Part Number: TPS62873-Q1
Other Parts Discussed in Thread: TPS62873

Hi,Ti support,

使用webnench仿真TPS62873。

Vi:3.3~3.5V

Vo: 0.5V

1、Iout =5A,webench 显示正常。当Iout为6A时, webench提示design update  failed,请问是什么原因呢?

2、失败的原因“phase margin either smaller than 35 or greater than 120”。按照运放环路稳定性判断准则,phase margin大于45度即可判断为稳定,为什么大于120度也不稳定呢?