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OPA860: 关于OPA860芯片发热问题

Part Number: OPA860


   最近用TI的OPA860设计了电路,但是制作成为PCB之后发现OPA860在通电之后有点微微发热的感觉,发热温度大概在40摄氏度左右。但是电路上面的其他元器件没有出现发热现象,请问呢这种现象正常吗?