Tl494 Ltspice |work| -

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)

Some community members have extracted and hosted the two essential files:

Third-party models often struggle during initialization or experience convergence problems. If your simulation crashes or fails to switch, apply these fixes: The "Time Step Too Small" Error tl494 ltspice

TI provides PSPICE models for the TL494 on its product page. These models are generally compatible with LTspice.

Current sense (optional)

Unlike many Linear Technology parts, the is a Texas Instruments component, meaning it is not included in the default LTspice library. You must use an external SPICE model ( .subckt ). Step-by-Step Model Implementation:

Plot the voltage at the CT pin to see the linear ramp waveform. fout=0

Final outputs: active low, open collector to VCC pullups G_OUT1 0 13 VALUE IF(V(130) > 2.5 & V(132)>2.5, 1e-3, 0) G_OUT2 0 14 VALUE IF(V(130) > 2.5 & V(132)<2.5, 1e-3, 0) D_OUT1 13 12 DCLAMP D_OUT2 14 12 DCLAMP R_OUT1 13 0 1MEG R_OUT2 14 0 1MEG