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OPA140: OPA140钳位放大问题

Part Number: OPA140

如上图所示,运放采用OPA140,±15V供电,双向向TVS管3.3V,将Vin短路,运放输出不管是什么情况,应该是约3.3V或-3.3V,不应该是饱和到+15V。现在示波器测试出来确实是+15V,这个是什么原因?