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你好，
客户将UCC28063改为UCC28061后，系统无法启动。Pin5 COMP低电平，其他引脚电压正常。请帮忙分析一下，谢谢！
电路图如下：
UCC28063 SCH.pdf
Hi
是否直接替代？，2个芯片还是有些差异的，不能直接替代，见美国那边的回复： e2e.ti.com/.../ucc28063-ucc28063-replace-ucc28061-the-system-fails-to-start
