About overshoot of XTR300

Gk 110

Other Parts Discussed in Thread: XTR300

0284.File.zip

Now the IAIN-and IAIN + of XTR300 is shorted.
When we rise suddenly from 4mA to 20mA,it is happening overshoot.
(See the attached Fig1 & see the attached schematic)

Overshoot does not occur when it connect a resistance of 500Ω to IAIN-and IAIN +.
(See the attached Fig2)

Removed the L2 & L3 & L4 & L5 of the attached schematic, but the overshoot occurred.
Please tell me how to suppress the overshoot.

over 11 years ago

0 Collin Wells over 11 years ago

TI__Guru 64135 points

Hello Sir,

Please confirm that you're describing R110 and R111 when you talk about the resistors "connected to IAIN- and IAIN+" Also please confirm that with R110 and R111 populated with 500 Ohm resistors you achieve the desired performance, but with them shorted with 0Ohm resistors you have the overshoot problem.

Also please confirm that the overshoot occurs in current output mode, and not voltage output mode. The instrumentation amplifier is not involved in the control loop for the current outputs, only the voltage outputs so it seems a little strange that it would affect the current output.

What is the component part number for L2 - L5? Are these devices actually inductors, or are they ferrite beads?

Does this design need to pass any industrial standard transient/EMC testing?

0 Gk 110 over 11 years ago in reply to Collin Wells

Expert 2440 points

Hi,Wells-san

Thank for your quick reply.
I'm sorry. My expression was bad.
The customer was shorted between the A00＋ & A00-(A01+ & A01-),when the output current was overshoot.
(see attached Fig1)

And they has connected 500ohm resister,between the A00＋ & A00-(A01+ & A01-).
The output current is normal at this time.
(see attached Fig2)

The customer uses current output mode.

Assuming that a light load is connected to the load side(A00+ ~ A00-), they conducted a short circuit test.
When they connect the resistance of 10Ω between the A00 + of A00-,overshoot was occur.
I'm confirming the component part number for L2 - L5.

What is cause of the overshoot?

Best regards,

8712.File.zip