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TPS40170高温工作发出刺耳的响声

Other Parts Discussed in Thread: TPS40170

Hi TI 专家:

   在使用TPS40170时,输出12V,带载9A,在常温下没问题,但是在做60度高温测试时,电路板出现明显刺耳的声响,如下是设计原理图,请帮忙看下。

电感值所用为10uH,电感参数也如下。我在webench仿真时的电感建议参数:L=6.8uH, DCR = 8.1 mΩ ,IDC = 18.5 A。感觉和电感值的影响不大,还请大神门帮忙看看。