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关于TPS40140实现的4相交错并联BUCK电路疑问

Other Parts Discussed in Thread: CSD87353Q5D, TPS40140

基于TPS40140和CSD87353Q5D实现一个可变输出电压的4相交错并联BUCK电路,但是现在遇到的问题是当参考电压为7.6V-8.6V时,输出振荡,占空比时大时小。供电电压为12V,最大输出电压10.5V,除了那个范围会振荡,其他电压值都能够正常输出。而降低供电电压也不会影响振荡电压范围,很是奇怪。还请有经验人士指教,在此谢过。