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tpa3255一个声道正常,另一个声音大就保护

Other Parts Discussed in Thread: TPA3255, LM2591HV, OPA1632, TPA3251

问TI工程师,

      TPA3255,2XBTL 模式,其中一个声道正常,另一个大动态时FAULT保护,OTW不亮.两个声道带4R电阻负载测试都正常,280W左右,OTW会亮,几十秒后超温亮FAULT灯.

其中一个声道接喇叭正常工作.另一个声道声音大一点FAULT灯就亮.,马上保护.排除温度问题,还有一个问题,大功率工作时,OTW灯会一闪一闪的,是不是正常的.PCB原理图是参照EVM来做的.除了15V降压部分.我用的是LM2591HVPWA185ST_top.PDFPWA185ST_bot.PDF