Tl494 Ltspice |verified| Jun 2026

: This pin provides a 0V to 3.3V input to limit maximum duty cycle. In simulation, grounding this pin allows for the maximum 45% (per output) duty cycle. Output Control (Pin 13) : Tie to GND : Single-ended operation (parallel outputs).

The schematic diagram of the circuit is shown below:

Are you looking to run a or an AC Small-Signal (.ac) analysis?

Save the model text as TL494.sub in the same directory as your LTspice schematic.

Tie Pin 13 to Pin 14 (VREF). Transistors 1 and 2 switch out of phase, restricting each output's maximum duty cycle to 45%. 4. Troubleshooting Common Simulation Issues tl494 ltspice

This is the most common hurdle. LTspice does not ship with a native TL494 model. You have three options:

: Output frequency is exactly half of the oscillator frequency.

Use the standard TL494 timing formula to calculate your target components:

| File | Purpose | |------|---------| | TL494.sub | Subcircuit definition (Spice netlist) | | TL494.asy | LTspice schematic symbol | | TL494_test.asc | Example test circuit | : This pin provides a 0V to 3

fosc=1.2RT×CTf sub o s c end-sub equals the fraction with numerator 1.2 and denominator cap R sub cap T cross cap C sub cap T end-fraction 2. Output Control (Pin 13)

Instructions on how to perform a to test your loop stability.

[ f_osc = \frac1R_T \cdot C_T ] (For RT in ohms, CT in farads, f in Hz) Actual output frequency = ( f_osc ) in single-ended mode, ( f_osc/2 ) in push-pull.

What specific are you building? (e.g., Buck, Push-Pull, Half-Bridge) What is your targeted switching frequency ? The schematic diagram of the circuit is shown

To make the component permanently available in your LTspice library, save the files to the following paths on your computer:

Comprehensive Guide to Simulating the TL494 in LTspice The TL494 is a industry-standard pulse-width modulation (PWM) control circuit. It is widely used in switch-mode power supply (SMPS) designs like push-pull, half-bridge, and full-bridge converters. Simulating this controller in LTspice allows you to test loop stability, duty cycle limits, and dead-time control before building physical hardware. 1. Finding and Installing the TL494 LTspice Model

For any engineer or hobbyist working on legacy or low-cost power converters, the TL494 LTspice model is indispensable

: The graphical symbol file used to place the component on your LTspice schematic. 2. Map the Files to Your LTspice Directories

: Frequency is set by external components ( RTcap R sub cap T CTcap C sub cap T