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TPA3251D 2BTL模式输出功率只能做到100W*2且极易出现保护现像,求帮助

Other Parts Discussed in Thread: TPA3251

请TI的工程师一个问题,我现在用tpa3251,2BTL模式,PVDD35V,接4欧负载,为何功率只能做到2*100W,超过就保护,且播放音乐时一有大动态的信号就保护,而且有时是单个通道保护,另一个通道又还是正常的,是什么原因?保护后CLIP_OTW 输出为低电平状态,工作时测试散热器离芯片最近端温度低于75度。原理图见附件TPA3251D2_2BTL_V0_1-1.pdf