Announcement: Spice Models for TC4421/TC4422 posted on my website...

How do they differ from what the manufacturer supplies here:?

you have to click "view datasheet" and then the spice model is available

My version converges and runs on LTspice. The Microchip version hangs on LTspice. ...Jim Thompson

Elaborating:

I got into the Spice modeling business several years ago when I had a need for a model of a chip that a client wanted me to design an interface to. No model existed, so I rolled my own. That turned into a hobby... amusing myself by how compactly I could model the essence of an OpAmp... often as little as one to two lines in a subcircuit.

The hobby has now become a business, nearly 80% of my workload... great, because the chip business has migrated to needing only very low power analog interfaces into digital processing :-( Which interfaces I design for a number of small medically-oriented chip houses.

As for what I announced here... I don't pick part numbers out of the air... how could I know what people need? Like most of the models on my Device Models & Subcircuits Page this was from a post on the LTspice List... nobody could get the Microchip model to run on LTspice... so I took that as a challenge... and succeeded ;-)

Most of what I'm doing now isn't so simple... humongous complicated functions where companies need to present a model that doesn't divulge their IP, yet simulates smoothly on ALL platforms.

Inquiries welcome ;-) ...Jim Thompson

Timestep too small, before even completing a rising edge. Occurs even at embarassingly loose settings (ABSTOL, CHGTOL = 1u). XSPICE.

Tim

-- Seven Transistor Labs, LLC Electrical Engineering Consultation and Contract Design Website:

"Jim Thompson" wrote in message news: snipped-for-privacy@4ax.com...

Here's an interesting one:

Small tweaks to initial timestep make big differences! Extreme sensitivity.

Oldish version of LTspice4 (Mar 5 2015) because I don't care about updating.

For other conditions, some traces continue plotting, while some stop in their tracks. What the hell is that about?

Regarding input clamp: the original model actually does that? Holy /f*ck/!

Tim

-- Seven Transistor Labs, LLC Electrical Engineering Consultation and Contract Design Website:

Yes. If that gives heartburn, set PARAM CLAMP=0.

I had no problem at all running on LTspice IV, but I always use "Alternate Solver". ...Jim Thompson