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TMS320F28335: 求助:28335 实现同步Buck 电源时纹波振荡

Part Number: TMS320F28335

数字电源小白求助大神,我在使用DSP28335 做同步buck电源时,发现怎么调PID参数纹波都会在个别输入电压点有振荡,不知道是PID 参数问题还是程序问题,已经反复调整过很多PID 参数了,始终不能做到全输入范围内的稳定,由于是第一次做数字电源,没有经验,还恳请给位大神赐教