Tl494 Ltspice Upd Guide

Some engineers use the LTC3892, a modern controller from ADI. However, its behavioral model does not match the TL494’s discrete logic, leading to inaccurate dead-time and error amplifier responses.

: This pin provides a 0V to 3.3V input to limit maximum duty cycle. In simulation, grounding this pin allows for the maximum 45% (per output) duty cycle. Output Control (Pin 13) : Tie to GND : Single-ended operation (parallel outputs). tl494 ltspice

Notes: This is a condensed, pragmatic starting point — refine slopes, gains, and the oscillator to match TL494 datasheet values (osc frequency set by RT/CT, deadtime control range, internal reference ≈5V, EA gains, output transistor drive limits). Some engineers use the LTC3892, a modern controller from ADI

* Oscillator (Pins 5, 6) * Note: Frequency depends on Rt/Ct. Simplified behavioral ramp here. * We generate a 0-3V sawtooth. A1 5 7 OSC RAMP=3 FREQ=100k * Note: Real implementation uses current source I=V(14)/Rt into Ct. In simulation, grounding this pin allows for the

.tran 10m

* Output Stage Control (Pin 13) B4 102 0 V=V(13) ; Output Mode