Hi,

I'm interested in finding Spice models (for use in LTSpice and Proteus) for these transistors:
STN851
2sk3919

I searched a lot on Google, no luck.

Does anyone have them or know how/where to get them?

Thank you.

 

Find (Google) file DSASW00427388.pdf.

 

Thank you.

But this is the result:

Your search - DSASW00427388.pdf - did not match any documents.

Suggestions:

• Make sure that all words are spelled correctly.
• Try different keywords.
• Try more general keywords.

Same result with Yahoo...

 

hi,
I got the same 'did not match any documents'
E

 

https://www.datasheetarchive.com/2SK3919 equivalent-datasheet.html

 

2SK3919 .SUBCKT 2SK3919 1 2 3 ************************************** * Model Generated by NEC * * All Rights Reserved * *Commercial Use or Resale Restricted * ************************************** * Model generated on December 1, 2000 * MODEL FORMAT: SPICE2G.6 * POWER MOSFET Model (Version 3.1) * External Node Designations * Node 1 -> Drain * Node 2 -> Gate * Node 3 -> Source *************************************** M1 4 5 3 3 NMOS W=5816268u L=0.34u DDS 3 1 DDS CGS 5 3 3.86E-10 RG 2 5 2.36 RD 1 4 RTEMP 0.146337E-3 FGD 1 5 VFGD 1 EVGD 7 0 1 5 1 DDG1 8 7 DD1 DDG2 8 0 DD1 EGD1 9 0 7 8 1 EGD2 10 0 8 0 1 COX 10 11 1.3966E-9 DCRR 11 9 DDG VFGD 11 0 0 ************************************************************************** .MODEL NMOS NMOS (LEVEL = 3 TOX = 500E-10 + XJ = 1.25E-6 LD = 0 + TPG = 1 RS = 0.17E-3 RD = 0.60E-3 + NSUB = 0.36E18 IS = 0 + UO = 600 VMAX = 0 KAPPA = 0.3 + NFS = 0.35E12 THETA = 0.5 + KP = 10.0E-6 PHI = 0.94 + CGSO = 0 CGDO = 0 CGBO = 0 ) ************************************************************************* .MODEL DDS D (CJO=4.44577082E-10 VJ=0.79839289 M=0.4594459 +RS=0.002912062767 IS=3.98984133E-12 TT=5.0E-9 N=1.0242892 BV=30) ************************************************************************* .MODEL DDG D (CJO=1.2006067E-09 VJ=0.649925638 M=0.4756177 +IS=1.00E-32 N=50 FC=1.00E-08) ************************************************************************* .MODEL DD1 D (CJO=0 N=1) ************************************************************************* .MODEL RTEMP RES (TC1=0.00658076 TC2=4.9450783E-05) ************************************************************************* .ENDS 2SK3919

Thank you.

I remember founding something like this for 2SK3919.
But, since I couldn't find a way to use it or translate into a Spice script that LTSpice and Proteus would understand, I gave up...

 

Well, the STN851 Spice model would of been more useful to me.
I thought about using it in this schematic:

led driver.jpg

I will try to explain it a bit:
Bat2 + L2 + C6 are used as a few ms timer.
Rl1 simulates the real switch.
Bat1 is a 3 cell 1200mAh Ni-Zn battery.
R4 is the internal resistance of Bat1.
I use C5 because at startup the oscillator requires more power than usual.
R5 is the internal resistance of L1.
I use C7, C8, R9, R10 just in this schematic to collect data.
R8 discharges C2 at poweroff (without it the driver won't start next time).
D2..D7 simulates a 6 x 6 2.7 V led matrice.

It isn't perfect, I know...

Q2(2N222A) could be replaced with STN851 to improve efficiency.

 

Well, I searched the PNP equivalent for STN851 and found STN951.
This one has an Pspice model:

.MODEL STN951 PNP
+Is = 0.317E-13
+Bf = 293.257
+Vaf = 55.277
+Ikf = 2.249
+Ise = 0.635E-14
+Ne = 1.677
+Br = 15.462
+Var = 48.584
+Ikr = 1.981
+Isc = 0.586E-12
+Nc = 1.533
+Nk = 0.292
+Rb = 9.416
+Rbm = 0.908E-01
+Nf = 0.981
+Re = 0.491E-01
+Rc = 0.346E-01
+Qco = 0.303E-09
+Rco = 0.263
+Vo = 15.034
+Gamma = 0.151E-09
+Cjc = 0.779E-11
+Vjc = 0.759
+Mjc = 0.441
+Cje = 0.315E-09
+Vje = 0.937
+Mje = 0.249
+Fc = 0.496
+Tr = 0.117E-07
+Tf = 0.281E-08
+Itf = 0.677
+Vtf = 1.522
+Xtf = 0.849

So, I changed the schematic to use PNP transistors (BC560C and STN951).
The efficiency grew from 84.3 to 88%.

I also made a better L1 coil (internal resistance is ~0.05 ohm instead of 0.15 ohm).
The efficiency grew to 88.5%.

This is the new schematic:



Is there anything I can do to further improve the schematic? I mean without losing the simplicity...