TPS27081A

Hello Neil,

We do not have one right now, but it is currently being worked on. I believe it should be done before years end if not by the beginning of next month.

Best,
Michael

Michael;

Thank you for the reply, disappointing as it is. Designs cannot wait until TI gets around to producing models for their products- this means lost sales $.

The data sheet is dated April 2012 so there has been more than three years to develop a model for this product.

A working TINA macromodel and reference circuit should be part of the release folder, just as a data sheet is required before releasing a product to market.

If support for a new product is incomplete, don't introduce it.

Neil,

I apologize for the inconvenience. I will follow up when the model is available.

Best,
Michael

Unfortunately that new model is unworkable.

Put in these changes to your reference circuit: 

input voltage= 8V

C1= 1uF

C2= 100uF

R4= 2.4G

Run a 10ms transient simulation- depending on whether you choose a "calculate operating point" or "zero initial values", you get a bogus result. Different results but both bogus.

A correctly working model should give a ramped up output as the load capacitor C2 charges up to a little less than 8V.

Whoever drew this reference circuit did not pay attention to the component labeling. "R1" is connected to the symbol pin "R2" and "R2" is connected to symbol pin "R1_C1"

If TI quit being paranoid about someone stealing their intellectual property and simply provided unencrypted macromodels these problems could be resolved far easier. I suspect these encrypted models are cobbled together to meet certain operating conditions, not one that works in actual customer applications.

Neil,

We identified an issue with some leakage current in the model which was interacting with the high load resistance. We are working on making the fix. This should be out shortly.

The TPS27081A seems to be working as it should now. Thank you.