One of LTSpice’s weaknesses is schematic aesthetics. When you publish your TL494 design:
This pin dictates the output topology:
Probe the output pin (Pin 9 or 10) and the switching node. You should see a PWM square wave tl494 ltspice
| Parameter | Change | Effect |
|-----------|--------|--------|
| Frequency | C_CT or R_RT | f ≈ 1.1/(R_RT * C_CT) |
| Duty cycle | Modify DTC voltage on pin 4 | Max duty ~96% if pin 4 grounded |
| Feedback | Change R1/R2 divider | Sets output voltage |
| Compensation | Adjust R_COMP, C_COMP | Loop stability | One of LTSpice’s weaknesses is schematic aesthetics
LTspice does not include a TL494 model by default. You have three options: Probe the output pin (Pin 9 or 10) and the switching node