Tl494 Ltspice Jun 2026

Oscillator frequency approx determined by RT/CT

Create a triangular/saw waveform using a behavioral voltage source from time Eosc OSC 0 VALUE V(VOSC) Bdummy VOSC 0 V = sin(2 pi 10000*time) ; simple test waveform (replace with proper RT/CT model)

To implement a safe margin preventing shoot-through in half-bridge configurations, create a voltage divider from (Pin 14) to provide roughly 0.1V to 0.3V to the DTC pin. Selecting Output Modes tl494 ltspice

Expected waveforms:

Plot the voltage at the Emitter ( E1 or E2 ) to see the PWM pulses. Oscillator frequency approx determined by RT/CT Create a

To use the TL494 in LTspice, you must download two files—the subcircuit (.sub) symbol (.asy)

.tran 0 5m 0 10n startup

Go to > Control Panel > SPICE and change the solver from Normal to Alternate . The Alternate solver uses a different mathematical approach that is more stable for complex IC models. No Output Switching (Stuck at 0V or VCC)

: Press T on your keyboard to add comments or SPICE directives [6]. The Alternate solver uses a different mathematical approach

If Pin 1 or Pin 16 is floating or tied incorrectly, the internal error amplifiers might force the feedback pin (Pin 3) to its absolute maximum limit, fully shutting down the PWM comparator. Tie unused error amplifier inputs to safe reference potentials (e.g., non-inverting to GND, inverting to REF). Share public link