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OPA2335做恒流源,直接把输入电压5v拉倒1点几伏

Other Parts Discussed in Thread: OPA2335, ADS1248

用ref3030+opa2335做恒流源,一打开开关,5V供电,输入电压就直接被拉低到1点几伏了,输入电流达到了1点几安,没想明白问题。

温度传感器:PT100。