Tl494 Ltspice Jun 2026

OUT1 and OUT2 (pins 13,14) are emitters (simplified: logic levels)

The is a staple PWM controller in power electronics, yet it presents a unique challenge for engineers because an official LTspice model does not exist from major manufacturers like Texas Instruments . Simulating this integrated circuit (IC) requires a blend of third-party model integration and a deep understanding of its internal architecture to achieve accurate results. The Architecture of the TL494 tl494 ltspice

Start by finding a trusted TL494 SPICE subcircuit; use it in an LTSpice schematic for the most realistic results. For fast experiments, a behavioral model is OK but validate final designs with vendor models and bench testing. OUT1 and OUT2 (pins 13,14) are emitters (simplified:

Use LTSpice behavioral elements to approximate PWM behavior when you only need functional simulation (not transistor-level fidelity). The simplified subcircuit below models: oscillator, ramp, error amp + comparator, and a PWM output (single-ended). This is for quick proof-of-concept control-loop and waveform checks. For fast experiments, a behavioral model is OK

Since LTspice doesn't include it, you have two main options: