LTSpice Adding Darlington Transistor

Thread Starter

unique_username_

Joined Mar 4, 2023
8
Hi! I want to add BDX53C and BDX54C to LTSpice. I saw some tutorials and tried to add transistors by typing their info to standard.bjt file but I think they do not work properly, when I run the DC op pnt analysis their beta values seem to be around 100 but they are supposed to be 750. Thank you!
 

Thread Starter

unique_username_

Joined Mar 4, 2023
8
Hi,
Please post your asc file and bjt file
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Hello Eric, the Power Amplifier circuit I am building is attached but for some reason I can not attach my .bjt file. But I copied the following lines to my .bjt file


.MODEL BDX54C pnp
+IS=1.56186e-12 BF=750 NF=1.1739 VAF=105.358
+IKF=0.113314 ISE=3.87694e-13 NE=1.50183 BR=0.996711
+NR=0.914768 VAR=101.604 IKR=0.0999754 ISC=1e-13
+NC=2 RB=13.4402 IRB=0.231192 RBM=10.9425
+RE=0.113908 RC=1.10586 XTB=0.488781 XTI=2.99692 EG=1.05
+CJE=2.60341e-10 VJE=0.95 MJE=0.23 TF=1e-09
+XTF=1 VTF=10 ITF=0.01 CJC=0
+VJC=0.95 MJC=0.23 XCJC=0.9 FC=0.5
+TR=1e-07 PTF=0 KF=0 AF=1

.MODEL BDX53C npn
+IS=1.20104e-12 BF=750 NF=1.2 VAF=78.0305
+IKF=0.154486 ISE=2.74105e-12 NE=1.68339 BR=0.997613
+NR=0.944651 VAR=100.59 IKR=0.0999892 ISC=1e-13
+NC=2 RB=11.2499 IRB=0.211062 RBM=10.1889
+RE=0.223578 RC=1.11789 XTB=0.495729 XTI=2.99866 EG=1.05806
+CJE=2.58424e-10 VJE=0.95 MJE=0.23 TF=1e-09
+XTF=1 VTF=10 ITF=0.01 CJC=0
+VJC=0.878229 MJC=0.23 XCJC=0.9 FC=0.5
+TR=1e-07 PTF=0 KF=0 AF=1
 

Attachments

ericgibbs

Joined Jan 29, 2010
18,766
hi.
Added your transistor data to my .bjt file, I will run it, check for the BF=750

BTW: the method to upload 'odd' file types is to add .txt to the end of the file name. eg. standard.bjt.txt

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ericgibbs

Joined Jan 29, 2010
18,766
Hi,
With that sine wave input amplitude, the output limiting, the biassing looks wrong.
Why do you think the transistor BF=750 is incorrect.?
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EG57_ 747.png
 
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