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DCR010505U隔离电源芯片的Vrec脚连接的Cfliter,这颗电容作用是什么,有什么要求!



隔离电源的芯片Vrec脚接一个滤波电容很容易理解,但是这颗电容加上去测量电压在均值6.9V,芯片输出Cout均值5V,去掉这颗滤波电容,该引脚电压均值9V,芯片输出Cout均值2.5V,不能正常工作,这颗电容作用是什么,有什么特殊的要求?