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LMH6321使用中遇到的问题(芯片很烫)

Other Parts Discussed in Thread: BUF634, LMH6321

   

如图:现在在做一个howland恒流源,之前用用buffer是采用buf634,现在项目要求增大电流,所以换用了LMH6321(DPAK8),现在电流可以达到目标值,并且也做了散热,但是芯片还是很烫很烫,其中VIN输入为 0 ~10V信号,无论是在0V 还是在10V都是比较烫的,所以请教下这电路还需要哪里改进,先谢谢了。