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UCC24612: LLC采用该芯片作为同步整流,输出电流振荡

Part Number: UCC24612

采用二极管,输出电流较为稳定,更换为同步整流后在3A时电流振荡,将VD串入15k电阻会改善该现象,但是会造成不小的同步整流开通和关闭延时。图中4通道为变压器副边电流波形。通道1和2为同步整流驱动。请教一下时什么原因呢?