Tl494 Ltspice Jun 2026

In one user’s troubleshooting, after updating to LTspice24, an existing TL494 model failed. The user had to manually correct several lines, including changing V§DT N007 DTC 0.12 to V1 N007 DTC 0.12 and correcting A4 0 OC 0 N008 0 0 N006 0 to A4 0 020 0 N008 0 0 N006 0 . This highlights the need to be comfortable editing the SPICE netlist directly to match the software’s evolving syntax requirements.

You cannot simulate the TL494 without a .sub (subcircuit) file and a corresponding .asy (symbol) file.

Configure a transient analysis to observe the startup behavior of the chip: Click > Edit Simulation Cmd . Select Transient and set the Stop Time to 5ms . Place a voltage probe on Pin 5 ( CTcap C sub cap T ) to observe the clean, linear sawtooth ramp.

LTspice does not include a TL494 model in its default component library. You must obtain a third-party macro-model (typically a .sub or .lib file) and its corresponding symbol ( .asy ). Where to Find the Model tl494 ltspice

The schematic diagram of the circuit is shown below:

Connect OUTPUT CTRL to GND . Both output transistors toggle simultaneously, allowing up to a 90% duty cycle. 5. Running the Simulation

The TL494 is a classic fixed‑frequency PWM controller IC. LTspice does include it by default, but you can add a third‑party model. You cannot simulate the TL494 without a

* TL494 Subcircuit for LTspice * Pin order: 1IN+ 1IN- 2IN+ 2IN- FB COMP CT RT GND C1 C2 VCC OUT1 OUT2 * Simplified functional model: oscillator, PWM comparator, error amps, outputs

The used heavily in switch-mode power supplies (SMPS), DC-DC converters, and inverter designs. Simulating this versatile controller in Analog Devices LTspice allows you to test feedback loops, adjust dead-time control, and verify circuit stability before building physical hardware.

Set to 10m (10 milliseconds) to allow the oscillator and internal reference voltages to settle. Set Time to Start Saving Data to 0 . Place a voltage probe on Pin 5 (

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

You can create the following circuit in LTspice:

To simulate it, you must create or import a SPICE model. Below is the step-by-step process to get the TL494 running in your LTspice environment.