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H桥电路,类似于电机应用,串电阻测电流,电阻两端电压差分输入OPA2340,输出波形很奇怪

Other Parts Discussed in Thread: OPA2340

如题,H桥的电压大约在60V,开关频率50K,为了减少共模输入电压,输入有个分压后再放大的过程,

仿真时没有啥问题,实际工作时输出波形类似于抬升了1.5V的方波,峰值没有达到5V,请教各位,哪里有问题呢?