If you want a quick, no-download model, create a behavioral oscillator + PWM:
Dead Time Control (Pin 4)
Here’s a draft piece for a — useful if you’re simulating a PWM controller for switching power supplies. tl494 ltspice
: Allow for simultaneous monitoring of both voltage and current loops. Adjustable Oscillator : Frequency is determined by external RTcap R sub cap T CTcap C sub cap T components.
: If your output transistors are "shooting through" (both on at once), increase the voltage at Pin 4 slightly to force a wider dead-time. Visualization of PWM Generation The TL494 works by comparing a sawtooth wave (generated at CTcap C sub cap T ) against a control voltage. If you want a quick, no-download model, create
In LTspice, our model must replicate these behaviors accurately for transient analysis ( .tran ).
The TL494 can be modeled efficiently in LTspice to predict the real-world performance of vintage and modern switch-mode power supplies. : If your output transistors are "shooting through"
Before diving into the simulation files, let’s recap the key features of the TL494 that matter in LTspice:
Build a voltage divider from Pin 14 (REF) to GND, feeding the center node to Pin 4. Applying 0V to 3.3V to this pin alters the maximum duty cycle from 45% down to 0% per output. Output Control (Pin 13)
What specific are you building? (e.g., Buck, Push-Pull, Half-Bridge) What is your targeted switching frequency ?
If you only have the .model or .subckt text, drag the text file directly into LTspice, right-click the .subckt TL494 line, and select Create Symbol . Basic Test Bench Configuration