Tl494 Ltspice ^new^ (720p 2026)

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

If the output oscillates wildly, your feedback compensation network is not optimized. Start by adding a capacitor in parallel with the feedback resistor to create a simple lag compensator.

In LTspice, our model must replicate these behaviors accurately for transient analysis ( .tran ). tl494 ltspice

Ground the (Pins 1, 2, 15, 16) or wire them into a stable max-PWM state to isolate the basic PWM engine during early test phases.

If you only have the .model or .subckt text, drag the text file directly into LTspice, right-click the .subckt TL494 line, and select Create Symbol . Basic Test Bench Configuration Since LTspice doesn't include it, you have two

Simulate a load transient to see how the TL494 adjusts the PWM duty cycle to maintain a stable output voltage.

). Without this, the ramp may be distorted, leading to incorrect PWM behavior. : Ground the (Pins 1, 2, 15, 16) or

Place the matching graphical component file TL494.asy inside the symbol directory: \Documents\LTspice\lib\sym\

Verify FB pin is not pulled above ~3.5V, and COMP pin voltage is below sawtooth peak.

Set a reasonable stop time, e.g., 5m (5 milliseconds), to allow the circuit to reach steady state.

For a 100kHz PWM generator: