Tl494 Ltspice Better →

The TL494 is a widely used PWM controller, but it is not natively included in LTspice. To use it, you must download a third-party subcircuit model ( ) and its corresponding symbol file ( Key Performance & Simulation Issues

Feedback Logic (Pin 3 takes precedence if pulled low) B_fb 102 0 V=MIN(V(100), V(101), V(3)) tl494 ltspice

• TL494.asy (LTspice symbol)
• TL494.sub (subcircuit model)
• TL494_test_buck.asc (schematic)

Schematic summary:

| Pin | Name | Function | |-----|---------|------------------------------| | 1 | IN1+ | Non-inverting input of error amp 1 | | 2 | IN1- | Inverting input of error amp 1 | | 3 | FEEDBACK| PWM comparator input (usually from amps) | | 4 | DTC | Dead-time control (0–3V) | | 5 | CT | Timing capacitor | | 6 | RT | Timing resistor | | 7 | GND | Ground | | 8 | C1 | Output transistor 1 collector | | 9 | E1 | Output transistor 1 emitter | | 10 | E2 | Output transistor 2 emitter | | 11 | C2 | Output transistor 2 collector | | 12 | VCC | Supply (7V–40V) | | 13 | OUT CTRL| Output control (GND=parallel, Vref=push-pull) | | 14 | VREF | 5V reference output | | 15 | IN2- | Inverting input of error amp 2 | | 16 | IN2+ | Non-inverting input of error amp 2 | The TL494 is a widely used PWM controller,