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请问这种LDO+运放的用法的作用是什么?

才疏学浅,没见过这种用法,想知道电路的作用是什么,运放反相端连接的是一个-2.5~2.5V的可调电压(电位器滑动端),虽然不是TI的芯片,但是还是厚着脸皮来问了