TLV172: Simulation in Orcad Pspice

Rajasekaran,

I also had issue with the AMC1300, try changing between zero condition start and resolved operating point start.

If that doesn't work then AMC1300 can be replaced with a fake signal to test the rest of the circuitry.

1346.with TLV172.TSC

Dear sir,

We replaced the AMC1300 into reference sine waveform as input to the amplifier. The amplifier circuit is working in TINA-TI. But the same circuit is not working in Orcad PSpice. 

Kindly we request you to confirm the circuit for amplifier in orcad. 

Thanking you.

Thanks & Regards,

Rajasekaran.

Amp_Measurement.zip

Dear sir,

we faced an issue with TLV172 amplifier running in orcad. So we tried to use THS4151 fully differential amplifier.

The circuit parameters are,

Measurement range : 0 to 75A

Shunt resistance : 1mOhm

AMC1300 High side voltage : 75mV

AMC1300 low side voltage : 615mV.

this voltage is given as input to THS4151 FDA having the gain of 10. 

The amplifier output voltage is 6.11V (in simulation). we are using +12V & -12V Power supply. 

Kindly verify the below circuit and confirm us to proceed further in the PCB design.

Thanking you.

Thanks & regards,

Rajasekaran.

AMC1300 with THS4151.TSC

ths4151.TSM

yes if you are moving to an FDA solution, you should consider some of the more recent parts

1. you do not need split supply, single is fine usually - The common mode loop will handle CM level shifting. 

2. why are you using +/-12V supplies, what output swing do you need, 

in ascending speed order, look at 

THS4531A

THS4561

THS4551

hi,

we prefer to have output signal in the range of -10 to +10V. This output signal is given  as input to another analog input module having the input range of +/-10V.

Kindly suggest the suitable FDA for the same. 

Thanks & regards,

Rajasekaran.

That is a pretty high input range, 

So for differential it does get confusing, 

If each input of module takes +/-10V,then the full differential input range is 40Vpp - really? 

Perhaps what the module spec means is +/-10V differential, then each input is +/-5V and the THS4561 is plenty for that. 

If you really want each output of the FDA to be producing +/-10V, look at the THS4131 low noise FDA - but watch out for slew limiting on such a large swing. The original OPA172 is only 10MHz GBP, or about 1Mhz in your gain of 10, so your input signal must be pretty slow. 

And yes, this discussion is far away from the OPA172 title, can you close this one and start one more like FDA output interface to AMC1300

Hi,

We are unable to find THS4561for ordering in mouser /digikey. So we are proceeding with  THS4151 model. 

as suggested, created a new post with AMC1300 and THS4151. (link)

Please check the circuit and share your suggestions. 

Thanks &Regards,

Rajasekaran.