LT Spice library IRFZ44, Centered tapped Transformer and PV cell

1. Sorry cant help with IRFZ44 but there are similar looking devices in the default libraries - can't you just examine datasheets and pick the closest one?
2. Model as two separate inductors with equal inductance, then couple them with the K directive and join the dot end of one to the non-dot end of the other to make the centre tap.
3. Model as a current source paralleled by a silicon diode, choose a diode with Vf vs If to suit the PV you want?

piglet

Re:1 - just checked and IRFZ44 model is in the default LTspice IV library but no longer in LTspice XVII

piglet

This one was fudged to provide approximately correct voltage/current

for the UIKO 156x156mm cell % W(mpp)V(mpp)A(mpp)V(oc) A(sc) S3 17.50 4.258 0.526 8.108 0.622 8.563

*I_DD=Isc-Voc/Ri=8.563-0.622/1.156=8.024 *I_s=300n(guess) *U_T=26mV *U_D=0.622 *U_T*ln(I_DD/IS)=U_D *n=U_D/(U_T*ln(I_DD/IS))=1.398 *duh.. have2guess for a better fit *I_s=3n .model PVCELL D(Is=3n N=1.1)

The IRFZ44 is a star in our "MOSFETs through the ages" section in AoE x-Chapters. That part was introduced ca 1986, and we cover how it quickly went through a series of changes, each with a different part-number suffix. Mostly they made improvements, from the point of view of switching applications, see x-Chapter table in DropBox:

We have lots more to say in the text, but as you can see, they massively changed most of the parameters, keeping only Vds at 55 to 60V, and Id(max) at 35 to 40 amps. While you can still order the original IRFZ44 die from Vishay, most of the IRFZ44 offerings will be different, so much that you'll want to use a different SPICE model.

--
 Thanks, 
    - Win

It's just a line of text. Someone who still has IV installed could pull it out of the standard.mos file.

--

John Larkin         Highland Technology, Inc 

lunatic fringe electronics

Here you go:

.model IRFZ44N VDMOS(Rg=1.94 Vto=4 Rd=5.0m Rs=0.0m Rb=6.8m Kp=19 Cgdmax=2.0n Cgdmin=0.08n Cgs=1.4n Cjo=0.9n Is=1.5p tt=63n mfg=International_Rectifier Vds=55 Ron=13.9m Qg=63n) .model IRFZ44V VDMOS(Rg=1.97 Vto=4 Rd=4.5m Rs=0.0m Rb=6.0m Kp=19 Cgdmax=3.2n Cgdmin=0.05n Cgs=1.6n Cjo=0.9n Is=0.5p tt=70n mfg=International_Rectifier Vds=55 Ron=13.9m Qg=67n)

Jeroen Belleman

.model IRFZ44N VDMOS(Rg=1.94 Vto=4 Rd=5.0m Rs=0.0m Rb=6.8m Kp=19 Cgdmax=2.0n Cgdmin=0.08n Cgs=1.4n Cjo=0.9n Is=1.5p tt=63n

.model IRFZ44V VDMOS(Rg=1.97 Vto=4 Rd=4.5m Rs=0.0m Rb=6.0m Kp=19 Cgdmax=3.2n Cgdmin=0.05n Cgs=1.6n Cjo=0.9n Is=0.5p tt=70n mfg=International_Rectifier Vds=55 Ron=13.9m Qg=67n)

That's an IRFZ44N model. See my post showing a table of the different types available. The N type is halfway along on the morphing process, with changes like Rds = 14 rather than 24mR, Coss 360 instead of 920pF, etc. The IRFZ44N is well stocked, but so is IRFZ44Z, which is near the end of the "optimization" pathway for the 'Z44 types.

--
 Thanks, 
    - Win

There can be huge variations between different manufacturers of a given part number. I've seen same-numbered power transistors from different sources with a 4:1 chip area difference. The small ones were fast and fragile.

--

John Larkin         Highland Technology, Inc 
picosecond timing   precision measurement  

jlarkin att highlandtechnology dott com 
http://www.highlandtechnology.com

That's too often true. According to Octopart, only IRF (now Infineon) makes the IRFZ44 family of parts.

--
 Thanks, 
    - Win

In the US at least, you can't copyright a part number. Anybody can sell an LM317.

--

John Larkin         Highland Technology, Inc 
picosecond timing   precision measurement  

jlarkin att highlandtechnology dott com 
http://www.highlandtechnology.com

Right. And there are many manufacturers.

I checked IRFZ44 on LCSC, all they offered was from IRF. But they offered LM317 from 11 different manufacturers, or from 9, if I restricted it to a TO-220 package. The lowest price was 6.8 cents, qty 100, compared to 25 cents for the cheapest "standard" part from a U.S. distributor. Their lowest price for an Infineon IRFZ44N was 21 cents, about 3x below any of the U.S. distributors.

--
 Thanks, 
    - Win

What is weird is that I can buy a board from China, with say an FPGA or a uP, with other parts, like a DRAM and connectors, qty 1, shipped, for less than I can buy just the main part here.

Are they getting better pricing than we are? Are these people piggy-backing on some giant OEM orders?

--

John Larkin         Highland Technology, Inc 
picosecond timing   precision measurement  

jlarkin att highlandtechnology dott com 
http://www.highlandtechnology.com

mandag den 2. december 2019 kl. 23.47.06 UTC+1 skrev John Larkin:

look at some of the prices on LCSC, and afaiu the prices are lower on the Chinese version of LCSC