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OPA547F发烫

Other Parts Discussed in Thread: OPA547

使用OPA547F搭的功率运放,电路图如下,输出电流限制的100mA,实际在空载下测试功能正常,但是芯片很烫。

PCB中覆铜面积不是很大,想请问下:

1.这种状态正常吗?

2.什么原因导致的发烫?

3.芯片的散热壳体需要接地吗?

4.有没有什么解决措施降低发热?