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UC2825: PWM发波异常

Part Number: UC2825


UC2825做推挽控制时,当COMP开环输入3.9V时出现PWM异常发波现象,如图所示,蓝色PWM出现连续两次发波,请问这种是芯片内部被干扰了吗?有解决方法吗?