求救，为什么UCC28251 20脚软起动脚调整外接电容起动状态无变化，当温度保护开关K2动做之后再恢复，没有软起动现象，电源恢复太快了，C21电容从104改成105没有任何变化，好像这个电容没有作用，请大神们指点，谢谢！！！
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