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UCD3138 交错PFC 调试问题

Other Parts Discussed in Thread: UCD3138

你们好!我在调试UCD3138交错PFC时出现如下问题:波形如下图所示,其中CH3是交流输入电流, CH4是其中一相驱动管DS波形,另外两个通道CH1和CH2没有用到。对外围电路进行了各种调试,DS波形和输入电流总会间歇性出现一段不稳定(或不正常的情况),请问这是什么情况引起的?是程序问题还是外围电路问题?