Unlike many Linear Technology parts, the is a Texas Instruments component, meaning it is not included in the default LTspice library. You must use an external SPICE model ( .subckt ). Step-by-Step Model Implementation:
If you cannot find a stable LTspice-specific model, you can often import
* LTspice Circuit: Buck Converter with TL494 VCC VCC 0 DC 15 VIN VIN 0 DC 24 tl494 ltspice
Plot the voltage at the CT pin to see the linear ramp waveform.
The key to success lies in obtaining a clean, properly corrected model — preferably from Valentin Volodin’s Bordodynov library — and following proper installation procedures. Common issues like output stuck high, waveform overlap, and simulation errors all have well-understood solutions that we’ve documented in this guide. Unlike many Linear Technology parts, the is a
So download that TL494 model, open LTSpice, and start simulating. Your bench’s smoke alarms will thank you.
: Often hosts updated versions that address common bugs like the oscillator ramp issues. Implementation Tips The key to success lies in obtaining a
To simulate the TL494, you must obtain a SPICE macromodel. Reliable subcircuits can often be found on community forums like the Analog Devices EngineerZone or independent SPICE repositories. Step 1: Download or Create the Subcircuit File
Connect and CT (e.g., 1nF) to set the frequency (
The TL494 SPICE models were often originally written for PSpice or older versions of LTspice. As a result, you may encounter compatibility issues, especially with LTspice24. Here are the most frequent problems and how to solve them: