AMC1301-Q1: output signal error is bigger

user5134806

Part Number: AMC1301-Q1
Other Parts Discussed in Thread: AMC1301

dears

the amc1301 SCH is shown below，PACK+ voltage about 500V，i found that the output signal is not equal to the theoretical calculation value，error is bigger。(R247+R248)=(R242+R243);how to set the R12 and R15，delet them is OK？

note that：PACK- is battery cathode，ISO_GND1 is amc1301 GND，There is no connection between them。

if I set PACK- connect to ISO_GND1 ，i Worry about the gnd noise influence the input signal。

over 7 years ago

0 Tom Hendrick over 7 years ago

TI__Guru**** 181291 points

Hi there user5134806,

The voltage across R253 has to be in the range of +/-250 mV for use with the AMC1301. Also, that voltage needs to be withing the common mode operating range of the AMC1301, so you can't simply delete R12 and R15. What are the resistor values in your schematic?

0 Lin Zhao over 7 years ago in reply to Tom Hendrick

TI__Intellectual 1230 points

Hi Tom,

How about connect ISO_GND1 to TP131 and remove R12 and R15? ISO_GND1 and the ground of VDD must be the same ground, correct? do you have any suggestion on how to modify this?

thanks.

0 Tom Hendrick over 7 years ago in reply to Lin Zhao

TI__Guru**** 181291 points

Hi Leo,

Yes, you can connect TP131 to ISO_GND and adjust R253 so that the voltage drop is within the specified range for the AMC1301.

Amplifiers

Amplifiers forum

AMC1301-Q1: output signal error is bigger