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UCC28C44: 关于UCC28C44和UCC28C54的差异性

Part Number: UCC28C44
Other Parts Discussed in Thread: UCC28C54

scope_43.jpgscope_10.jpg

工况是反激电源满载关机的瞬间。左图为使用了UCC28C54、右图使用了UCC28C44。图中蓝色是VCC,黄色是PWM波、绿色是CS引脚 。在这里为什么左图中当COMP引脚和CS引脚为高电平的时候,PWM波立马关闭;但是右图中PWM没有关闭。按照UCC28C44的规格书中此时PWM波应该关闭。