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I get an error when using the LT3763 model from the official library

Thread Summary

The user encountered a 'Number of nodes does not match number of pins' error when simulating the LT3763 circuit in LTspice 24.1.10. The issue was resolved by deleting conflicting model folders in the Documents directory, which contained outdated models. The solution involved ensuring that only the latest LTspice version and models were used.
AI Generated Content
Category: Software
Product Number: LT3763
Software Version: LTSpice V (x64) 24.1.8

Contents of log file:

LTspice 24.1.8 for Windows
Circuit: C:\Users\US02119\AppData\Local\LTspice\examples\Applications\LT3763.net
Start Time: Thu Nov 20 15:58:26 2025
C:\Users\US02119\AppData\Local\LTspice\examples\Applications\LT3763.net(33): Number of nodes (25) does not match number of pins (27) of sub-circuit "lt3763".
X§U1 N011 N005 N001 N002 N006 N004 N003 N013 NC_01 N006 N018 0 N006 N006 N019 OUT N010 N017 N015 N023 N007 N022 N009 N020 N008 LT3763
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

Sounds like some kind of model error but maybe something I'm doing. Any ideas?

Best regards,

Kevin

  • Dear  ,

    I cannot reproduce this. Please update components.

    I'd also recommend updating to LTspice 24.1.10.

    Best Regards,
    Mathias

  • I didn't realize I wasn't on the latest, so I did the update....the error I'm getting now is indeed different. Log report below:

    LTspice 24.1.8 for Windows
    Circuit: C:\Users\US02119\AppData\Local\LTspice\examples\Applications\LT3763.net
    Start Time: Fri Nov 21 07:08:39 2025
    --- Expanded Netlist ---
    R5 IN N003 R=1000
    R4 IN N001 R=0.0025
    R6 N001 N004 R=1000
    R7 IN N002 R=84500
    R8 N002 0 R=15400
    C8 N005 0 CAPACITANCE=4.7e-06
    C9 N007 N009 CAPACITANCE=2.1999999999999998e-07
    Q1 N001 N008 N009 RJK0305DPB
    Q2 N009 N011 0 RJK0301DPB
    R9 N010 OUT R=0.0025
    R10 OUT N018 R=47500
    R11 N018 0 R=12100
    C10 OUT 0 CAPACITANCE=0.00021999999999999998 M=2 V=6.3 Irms=3.2 Rser=0.012 Lser=0 mfg="KEMET" pn="T520V227M006ASE012" type="Tantalum"
    V1 IN 0 DC=24
    V2 N022 0 PULSE=(0,2,0.0001,1e-08,1e-08,1.9999999999999998e-05,4.9999999999999996e-05)
    D1 N005 N007 1N5819
    D2 OUT N021 PT-121-B
    Q3 N021 N020 0 IRF6201
    C6 N003 N004 CAPACITANCE=1e-06
    C7 N001 0 CAPACITANCE=4.7e-06
    L1 N009 N010 Rser=0.002 INDUCTANCE=1.5e-06
    .model RJK0305DPB VDMOS(Rg=0.6 Vto=1.95 Rd=0.0027 Rs=0.0007 Rb=0.0013000000000000002 Kp=40.8 Lambda=0.07 Cgdmax=9.6e-10 Cgdmin=5.000000000000001e-11 Cgs=9.800000000000001e-10 Cjo=9.800000000000001e-10 Is=4.8e-11 ksubthres=0.1 mfg="Renesas" Vds=30 Ron=0.0067 Qg=8e-09)
    .model PT-121-B D(Is=4.352e-07 Rs=0.032 N=8.37 Cjo=5e-09 Xti=100 Iave=20 Vpk=5.3 mfg="Luminus" type="LED")
    .model RJK0301DPB VDMOS(Rg=0.8 Vto=2.15 Rd=0.0009000000000000001 Rs=0.0002 Rb=0.0005 Kp=170 Lambda=0.06 Cgdmax=1e-09 Cgdmin=4.0000000000000007e-10 Cgs=4e-09 Cjo=5.600000000000001e-10 Is=5.6e-11 ksubthres=0.1 mfg="Renesas" Vds=30 Ron=0.0023 Qg=3.2e-08)
    .model IRF6201 VDMOS(Rg=1.5 Vto=1.05 Rd=0.00085 Rs=0.0001 Rb=0.00175 Kp=300 Cgdmax=1.8000000000000002e-08 Cgdmin=2e-09 Cgs=6.6e-09 Cjo=1.5000000000000002e-09 Is=1e-10 ksubthres=0.1 mfg="International_Rectifier" Vds=20 Ron=0.0019 Qg=1.3e-07)
    .model 1N5819 D(Is=3.17e-05 Rs=0.051 N=1.373 Cjo=1.1e-10 M=0.35 Eg=0.69 Xti=2 Iave=1 Vpk=40 mfg="OnSemi" type="Schottky")

    .end

    C:\Users\US02119\AppData\Local\LTspice\examples\Applications\LT3763.net(33): Number of nodes (25) does not match number of pins (27) of sub-circuit "lt3763".
    X§U1 N011 N005 N001 N002 N006 N004 N003 N013 NC_01 N006 N018 0 N006 N006 N019 OUT N010 N017 N015 N023 N007 N022 N009 N020 N008 LT3763
    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

  • oops I opened the wrong one apparently. Here is the message I get in 24.1.10. The message makes it sound like a model and symbol problem but I can't access what is under the hood of those. Any ideas.:

    LTspice 24.1.10 for Windows
    Circuit: C:\Users\US02119\AppData\Local\LTspice\examples\Applications\LT3763.net
    Start Time: Fri Nov 21 07:13:14 2025
    --- Expanded Netlist ---
    R5 IN N003 R=1000
    R4 IN N001 R=0.0025
    R6 N001 N004 R=1000
    R7 IN N002 R=84500
    R8 N002 0 R=15400
    C8 N005 0 CAPACITANCE=4.7e-06
    C9 N007 N009 CAPACITANCE=2.1999999999999998e-07
    Q1 N001 N008 N009 RJK0305DPB
    Q2 N009 N011 0 RJK0301DPB
    R9 N010 OUT R=0.0025
    R10 OUT N018 R=47500
    R11 N018 0 R=12100
    C10 OUT 0 CAPACITANCE=0.00021999999999999998 M=2 V=6.3 Irms=3.2 Rser=0.012 Lser=0 mfg="KEMET" pn="T520V227M006ASE012" type="Tantalum"
    V1 IN 0 DC=24
    V2 N022 0 PULSE=(0,2,0.0001,1e-08,1e-08,1.9999999999999998e-05,4.9999999999999996e-05)
    D1 N005 N007 1N5819
    D2 OUT N021 PT-121-B
    Q3 N021 N020 0 IRF6201
    C6 N003 N004 CAPACITANCE=1e-06
    C7 N001 0 CAPACITANCE=4.7e-06
    L1 N009 N010 Rser=0.002 INDUCTANCE=1.5e-06
    .model RJK0305DPB VDMOS(Rg=0.6 Vto=1.95 Rd=0.0027 Rs=0.0007 Rb=0.0013000000000000002 Kp=40.8 Lambda=0.07 Cgdmax=9.6e-10 Cgdmin=5.000000000000001e-11 Cgs=9.800000000000001e-10 Cjo=9.800000000000001e-10 Is=4.8e-11 ksubthres=0.1 mfg="Renesas" Vds=30 Ron=0.0067 Qg=8e-09)
    .model PT-121-B D(Is=4.352e-07 Rs=0.032 N=8.37 Cjo=5e-09 Xti=100 Iave=20 Vpk=5.3 mfg="Luminus" type="LED")
    .model RJK0301DPB VDMOS(Rg=0.8 Vto=2.15 Rd=0.0009000000000000001 Rs=0.0002 Rb=0.0005 Kp=170 Lambda=0.06 Cgdmax=1e-09 Cgdmin=4.0000000000000007e-10 Cgs=4e-09 Cjo=5.600000000000001e-10 Is=5.6e-11 ksubthres=0.1 mfg="Renesas" Vds=30 Ron=0.0023 Qg=3.2e-08)
    .model IRF6201 VDMOS(Rg=1.5 Vto=1.05 Rd=0.00085 Rs=0.0001 Rb=0.00175 Kp=300 Cgdmax=1.8000000000000002e-08 Cgdmin=2e-09 Cgs=6.6e-09 Cjo=1.5000000000000002e-09 Is=1e-10 ksubthres=0.1 mfg="International_Rectifier" Vds=20 Ron=0.0019 Qg=1.3e-07)
    .model 1N5819 D(Is=3.17e-05 Rs=0.051 N=1.373 Cjo=1.1e-10 M=0.35 Eg=0.69 Xti=2 Iave=1 Vpk=40 mfg="OnSemi" type="Schottky")

    .end

    C:\Users\US02119\AppData\Local\LTspice\examples\Applications\LT3763.net(33): Number of nodes (25) does not match number of pins (27) of sub-circuit "lt3763".
    X§U1 N011 N005 N001 N002 N006 N004 N003 N013 NC_01 N006 N018 0 N006 N006 N019 OUT N010 N017 N015 N023 N007 N022 N009 N020 N008 LT3763 ;§pnba BG)INTVCC)VIN)EN/UVLO)VREF)VINN)VINP)IVINMON)_FAULT)FBIN)FB)GND)CTRL2)CTRL1)SS)SENSE-)SENSE+)VC)ISMON)RT)BOOST)PWM)SW)PWMOUT)TG
    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

  • Please post the entire log file here.

    Best Regards,
    Mathias

  • Oh wait, you just did that. Can you instead please send me the file

    C:\Users\US02119\AppData\Local\LTspice\lib\sub\LT3763.sub

    Best Regards,
    Mathias

  • It won't let me upload a .sub file so I changed it to a .txt.

    <Binary File>
    
    s:��mt������܎�w`�މG�`O�����7Z_�=���2�?+W��zN�{kJH���S�+go3Z�o|�2aɇ��6�N�A�qW��/�)�)�Ӎ,��S8�e(�<R�U-I��V+i�uP-v$��V�!�vp��	��bm��u�!r�	���ٿ��h��p���]l��xUI�H��IYG^�-�x^~�̛wxDVĐ|��)b��Z+�["A�v>�&ރ���n6�V
    1����T�0<i�c6ۦg�V�XvL�g�R7�8[��Y�&��B�;�1'�$aUy7^q��v��9}L��X<+�K�_!|"h;b�[p���#��E^���!�eQ��m��;�\%�&�ӏ�r{�.��5��QR��c%-S<� !!��KKɰ�!]�)[��X��q;�yE���b���	��Y�:,���3�R�Fn��*w�K��9s;k�8�)\���`�$�Et��5BB�3����6}���qְ�a_��$�����b�}
    �ֲ���@�8i9����
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  • Thanks. This is the right file, but it is not the one loaded by LTspice. Your setup is somehow messed up. Do you also have other, older LTspice versions installed? The previous version of the LT3763 model had two more pins. It is this older version that you are using  inadvertently.

    Best Regards,
    Mathias

  • Yessir. When I installed the newer LTSpice, several versions back it didn't ask me to uninstall XVII. So I just left it in there since some of my old files won't run in the new one and only work in XVII. I can manually update the model if I could find it somewhere. 

  • Or maybe I just uninstall everything and then do a fresh install of the latest??? Do you have any recommendations?

  • That's fine, LTspiceXVII can coexist without problems. Not in your case, though.

    You already have the right model file. The question is why your LTspice 24.1.10 loads the outdated version from LTspiceXVII instead.

    Since I can't investigate your system it might be faster for you to just uninstall _all_ LTspice versions and reinstall them from scratch. But keep them separate.

    Best Regards,
    Mathias