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TPA3110D2工作电压问题

我司在应用TPA3110D2时,工作电压低于18V时能工作正常,高于18V,到26V时,喇叭输出时有时无,声音小时正常.请问是哪里的问题?芯片工作在PBTL模式,输出接120欧姆磁珠(如下应用电路).无输出电感.