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TPA3255的GVDD总是烧坏

Other Parts Discussed in Thread: TPA3255, TPS54340

请教论坛里的大神,我做的TPA3255功放电路,为什么总是烧坏GVDD引脚,烧坏后的现象是GVDD和地短路。

功放的PVDD是用36V开关电源提供的,GVDD的12V是通过TPS54340将36V转换为12V的,实测11.6V,最近调试的时候总是上电后没工作多久,功放的FAULT指示灯就亮了,之后电源电流突然变大,接着GVDD就与地短路了。电路是按照规格书中给的两路BTL接法。