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UC3825A: "TOO FEW NODES" ERROR IN LTSPICE

Riza Gunes
Prodigy 115 points
Part Number: UC3825A
Other Parts Discussed in Thread: UC1825

Hi,

Firstly, I need to say that we already have bought UC3825A in physical. But when we try to simulate UC3825A in LTSPICE, we get error "Too few nodes ....", and I download spice model from TI own website.

My LTSPICE version is XVIIx64. When I search why that error arise from, I understand that Spıce Model which I download from your own website is encrypted. Could you provide us unencrypted model. We cannot start doing our prototype circuit without simulation has done.

We are looking forward your quick response.

Best regards,

  • 0
    TI__Expert 7900 points

    Hello Riza,

    There are 2 files in the UCx825.ZIP model.  I see the .TSM model, which looks encrypted.  However, I can open the .LIB file using Open File With > Notepad and see the entire model, unencrypted.  I have attached the .LIB file here.

    UC1825_TRANS.lib

    Here are the first 20-30 from this .LIB file:

    *$
    * UC1825
    *****************************************************************************
    * (C) Copyright 2018 Texas Instruments Incorporated. All rights reserved.
    *****************************************************************************
    ** This model is designed as an aid for customers of Texas Instruments.
    ** TI and its licensors and suppliers make no warranties, either expressed
    ** or implied, with respect to this model, including the warranties of
    ** merchantability or fitness for a particular purpose. The model is
    ** provided solely on an "as is" basis. The entire risk as to its quality
    ** and performance is with the customer.
    *****************************************************************************
    *
    ** Released by: WEBENCH Design Center, Texas Instruments Inc.
    * Part: UC1825
    * Date: 10SEP2018
    * Model Type: Transient
    * Simulator: TINA
    * Simulator Version: 9.3.150.328 SF-TI
    * EVM Order Number:
    * EVM Users Guide:
    * Datasheet:
    *
    * Model Version: Final 1.00
    *
    *****************************************************************************
    *
    * Updates:
    *
    * Final 1.00
    * Release to Web
    *
    *****************************************************************************
    * Model Usage Notes:
    *
    *
    *****************************************************************************
    *$
    .SUBCKT UC1825_TRANS OUT_B OUT_A ILIM-SD RAMP CT GND Vcc VC VREF NI INV E-A_OUT CLOCK
    + RT GND SS
    IS1         GND SS 9U
    VS1         VDD GND 5
    V4          RAMP 22 1.25
    V3          25 GND 9
    V2          26 GND 1
    V1          28 GND 1.4
    XU8         CLOCK VDD CT RT GND RC_CLK_0
    XU9         VREF 10 NOT_0

    Regards,

    Eric