Navigate to LTspice global control options and switch the SPICE Solver engine from Normal to Alternate . The Alternate solver uses a modified matrix configuration that processes sharp, high-frequency transients with greater stability.
: If you did not place the .sub file into the system directory, add the following text command anywhere on your schematic: .include TL494.sub Use code with caution. Running the Analysis
For (e.g., Buck or Boost), the output switching frequency equals the oscillator frequency: tl494 ltspice
Purpose: verify startup, soft‑start and current‑limit.
fout=1.1RT×CTf sub o u t end-sub equals the fraction with numerator 1.1 and denominator cap R sub cap T cross cap C sub cap T end-fraction Navigate to LTspice global control options and switch
Search reputable electronics simulation communities, open-source repositories (such as GitHub), or DIY audio/power electronics forums for a verified TL494 SPICE subcircuit. You will need two files:
Connect OUTPUT CTRL (Pin 13) to REF (Pin 14). The outputs (C1/E1 and C2/E2) alternate phases, providing a maximum 45% duty cycle per channel. Running the Analysis For (e
Error Amplifiers (Simplified) E_amp1 100 0 VALUE=LIMIT((V(1)-V(2))*100000, 0, 5) E_amp2 101 0 VALUE=LIMIT((V(16)-V(15))*100000, 0, 5)
Grounding Pin 4 provides the default minimum dead-time of roughly 3%.