LMP7711 model error

Stefan,

In your circuit, you have connected a +48V to the VEE pin. Is that intentional? What were you hoping to see with this circuit?

I am attaching a simple transient circuit to test the device. (Analysis-->Transient... and click on OK)

Inv_LMP7711.TSC

The device appears to function normally in this circuit.

Hi Britt,

my intention was to simulate a highside current sense, see the attached file. R1 is the shunt resistor, the OPA-supply is centered around the 48V.

I've seen this circuit in many application notes, it should work.

currentsense1.tsc

Stefan,

I am a modeling engineer in the WEBENCH Signal Chain Modeling team.

The LMP7711 model uses a lot of internal nodes connected to ground ('0' node).
Sometimes this causes the model to work fine on a balanced, split supply, but not so well on higher-voltage single-ended supply like yours.

I did a quick search-and-replace that replaced the model's  '0' nodes with a floating ground.
The revised model seems to give the expected DC solution and a quick transient sim in the attached circuit looked okay.

Please give it a try and let me know...

This is an older model. If these quick revs don't work, it will take a while to generate a new model.

Regards,
JohnTest_LMP7711_Revised.TSC