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XTR111芯片输入电压0V时,怎么才能输出4ma电流呢

Other Parts Discussed in Thread: XTR111, XTR115

XTR111芯片输入电压0V时,怎么才能输出4ma电流呢,电路怎么连接

  • 输入电压为0时,我想要输出电流为4mA,电路怎么连接,搭好电路后,输入电压0V时,总是输出电流为0

  • 根据Iout的公式,输入是0V,输出肯定也是0mA。

    假设输出4mA,Rset=2.5Kohm,根据公式可计算输入电压为1V,但如果是0V的话,在输入端可加一个分压电路,XTR115内部集成regulator输出5V,只要在输入端建立一个电阻分压电路即可。datasheet 中Figure 43给出了例子: