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TPS92691:在boost回路开关管D极出现严重振铃现象

Other Parts Discussed in Thread: TPS92691

1:使用TPS92691 boost拓扑结构搭建的LED驱动;

2:VIN 7.5-20V,VO 27-33V,IO<10A

3:开关频率试过100-320K(但都有振铃现象)

4:尝试匹配Rg,未收获成效

5:尝试增加阻容吸收未收获成效

6:PWM频率尝试1-48K,未收获成效

7:更改Cin.Cout,L均为消除此现象

以上是我调试所用手段,均为消除这种MOS管关断产生的振铃现象,如下图所示

这种现象导致最直接的后果便是MOS管D极电压过冲,MOS管和LED寿命短,输出效率提不上。

为此请教官方,望给予支持,万分感谢!