Tl494 Ltspice ((link)) -

If you want to refine your simulation schematic further, let me know:

Simulating complex analog/digital hybrid controllers like the TL494 can sometimes result in slow execution or initialization errors in LTspice. Oscillator Fails to Start

Connect Pin 13 directly to GND . Both output transistors switch simultaneously, permitting a maximum duty cycle near

Another convenient source is the LTwiki. The “Bordodynov’s Electronics web page” available through the LTwiki main page contains the complete library of TL494 symbols and models. This is regularly cited in engineering forums as the go-to resource for TL494 LTspice models. tl494 ltspice

Plot the voltage at the Emitter ( E1 or E2 ) to see the PWM pulses.

: The TL494’s output transistors can only directly drive small-signal transistors, not large power MOSFETs. Many engineers use gate drive transformers (GDTs) to isolate the control IC from the power stage. In LTspice, GDTs introduce additional inductances that can dramatically slow down the simulation unless modeled carefully.

By establishing clean subcircuit definitions, verifying oscillator behaviors via If you want to refine your simulation schematic

fout=0.55RT×CTf sub o u t end-sub equals the fraction with numerator 0.55 and denominator cap R sub cap T cross cap C sub cap T end-fraction In LTspice, map standard commercial resistor values (e.g., ) and precision film capacitors (e.g., ) to visually verify the clean formation of the sawtooth ramp waveform at the CTcap C sub cap T node. Managing Output Control (Pin 13)

On-chip operational amplifiers configuration used for voltage or current loop feedback control.

Have you simulated the TL494 in LTSpice? Share your convergence tricks and custom models in the comments below. : The TL494’s output transistors can only directly

* Output Transistors (Pins 8,9,10,11) * Q1 (Pins 8 Coll, 9 Emit) * Q2 (Pins 10 Coll, 11 Emit) S1 8 9 101 0 SW S2 10 11 101 0 SW

Error amplifier (single op-amp, high gain)

* PWM Comparator Logic * Sawtooth internal node (assume node 100) B2 100 0 V=IDTMOD(I=10m, MODE=1) ; Simplified ramp generator for logic B3 101 0 V=IF(V(100) > (V(3)+V(4)), 0, 1)