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INA139输入问题

Other Parts Discussed in Thread: INA139

下图是我用INA139/3K搭建的TEC电流检测电路,实际TEC模块的内阻为0.8欧姆;我用电阻模拟负载测试的时候,发现 VIN+ - VIN- ≥0.3V  时,输出电压才会满足VOUT = VIN+ - VIN-;看手册输入是没有这个限制的,想问一下为什么会出现这种情况。