Tl494 Ltspice Jun 2026

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 supplies (SMPS), DC-DC converters, and inverter designs. Simulating this controller in LTspice allows you to test loop stability, duty cycle limits, and dead-time control before building physical hardware.

* Dead Time & PWM Logic (Pin 4) * Dead time voltage effectively offsets the sawtooth floor or clamps the comparator. * If V(4) > Sawtooth, Output is OFF. * Effective PWM comparator: Duty Cycle = (V_saw - V_dead) / V_saw_amp.

: A TL494.sub file is available in the texane/power_inverter repository. tl494 ltspice

Easily tweak oscillator capacitors ( CTcap C sub cap T ), timing resistors ( RTcap R sub cap T

In LTspice, our model must replicate these behaviors accurately for transient analysis ( .tran ). Comprehensive Guide to Simulating the TL494 in LTspice

pin; they may only function in push-pull mode even when configured for parallel operation by switching the pin from cap V sub r e f end-sub to GND [3]. Waveform Overlap

* Oscillator (Pins 5, 6) * Note: Frequency depends on Rt/Ct. Simplified behavioral ramp here. * We generate a 0-3V sawtooth. A1 5 7 OSC RAMP=3 FREQ=100k * Note: Real implementation uses current source I=V(14)/Rt into Ct. * Dead Time & PWM Logic (Pin 4)

The text file containing the netlist, subcircuit architecture, comparators, and error amplifiers.

If you want a quick, no-download model, create a behavioral oscillator + PWM: