Other Parts Discussed in Thread: AMC1200, , AMC1311
Hi,
my customer design a circuit below with AMC1300B,
It's used to sense the DC bus voltage. The overall schematic is as below:
When the DC bus is unconnected, OUTP-OUTN will be 0.18V, when DC bus is shorted, OUTP-OUTN will be 0V.
And the 0.18V bias will go along with DC bus voltage applied as long as DC bus is not shorted, which means (OUTP-OUTN)=k*VDC+0.18V.
With exactly the same circuit, if we replace AMC1300B with AMC1200, OUTP-OUTN will be 0V with DC bus unconnected. There won't be 0.18V bias.
With AMC1300B, we removed the clamp diode at INP and INN, the 0.18V bias is still there.
Why would this happen?
