Tl494 Ltspice [upd] | FREE HOW-TO |

In this article, we have demonstrated how to use LTSpice to simulate and analyze TL494-based power supply circuits. The example circuit, a half-bridge power supply, was simulated and analyzed, and the results were presented. By using LTSpice to simulate and analyze power supply circuits, designers can optimize circuit performance, reduce design time, and improve overall system reliability.

Dead Time Control (Pin 4)

: Use a P-Channel MOSFET or a NPN transistor driven by the TL494's uncommitted collectors (Pins 8 and 11). tl494 ltspice

Sweep the voltage at pin 4 from 0V to 3V using .step param V_DT 0 3 0.5 . Watch the maximum duty cycle drop from 96% to 0%. This is invaluable for transformer-based designs like push-pull or forward converters.

Set via an external resistor ( RTcap R sub cap T ) and capacitor ( CTcap C sub cap T In this article, we have demonstrated how to

LTSpice is the ideal platform because it handles transistor-level nonlinearities and switching transients better than many paid tools—and it’s free.

Wire to REF to configure push-pull switching. Dead Time Control (Pin 4) : Use a

: C:\Users\[YourUsername]\Documents\LTspiceXVII\lib\sym\AutoGenerated\ (or a custom subfolder).

Simulating the TL494 PWM Controller in LTspice is a staple in the world of power electronics, frequently used for fixed-frequency pulse-width modulation (PWM) control in push-pull, half-bridge, and full-bridge switch-mode power supplies (SMPS)

To inject custom dead-time dynamically during simulation, connect a voltage source or a resistor divider to Pin 4. A voltage ranging from scales the dead-time up to 100%. Step 3: Setting Up a Test Simulation Circuit