Ltspice | Tl494

The TL494 shines in push-pull because of its alternating output stages.

Simulation adjustments:

Common pitfall: In LTspice, the transformer leakage and magnetizing inductance must be realistic. Add Rser=0.01 to inductors to avoid unrealistic ringing.

This is a behavioral model, not transistor-level. It lacks: tl494 ltspice

For most educational and prototyping purposes, it works well.

For advanced users: create a simplified model using voltage-controlled switches, a sawtooth generator (using a BV source with V=idt(1/Ct*V(osc_enable))), and comparators. This is educational but time-consuming.

Pro Tip: Once you have the tl494.asy symbol and .lib file, place them in the same folder as your LTSpice schematic. Use .include tl494.lib in the schematic. The TL494 shines in push-pull because of its

Once your simulation runs, use LTspice’s powerful analysis tools to refine your design:

Simulating the TL494 in LTspice provides invaluable insight into PWM control logic and feedback stability. While the absence of a default model requires the user to import or create a subcircuit, the process highlights the modular nature of the chip. By correctly configuring the Dead-Time control and Error Amplifiers, engineers can validate complex power supply designs before hardware prototyping, significantly reducing development time and cost.

LTSpice doesn’t include a built-in TL494 device, so you have three realistic options: Common pitfall: In LTspice, the transformer leakage and

Below is a step-by-step walkthrough for option 1 (using a vendor model) and a compact alternative using a behavioral subcircuit for quick tests.

When simulating SMPS in LTspice, "Timestep too small" errors are common.

.tran 0 5m 0 10n startup

Use startup to ensure the supply ramps up from 0V, preventing convergence errors.