Tl494 Ltspice «FAST ◆»

Once we have created the TL494 model, we can simulate it in LTspice. The following is an example of a simple circuit that uses the TL494 to control a switching power supply:

To perform an AC analysis of the circuit, we can use the .ac directive: Tl494 Ltspice

To perform a transient analysis of the circuit, we can use the .tran directive: Once we have created the TL494 model, we

Simulating the TL494 in LTspice: A Comprehensive Guide** including the voltage reference

Vin 1 0 DC 12 R1 1 2 1k C1 2 0 100u L1 3 4 10u R2 4 5 1k C2 5 0 100u TL494 6 7 8 9 10 11 12 13 .subckt TL494 1 2 3 4 5 6 7 8 ... .ends In this example, the TL494 is used to control the output voltage of a buck converter.

.subckt TL494 1 2 3 4 5 6 7 8 Vref 1 0 DC 5 R1 1 2 1k R2 2 3 1k C1 3 0 100n E1 4 0 VALUE={V(3)} R3 4 5 1k C2 5 0 100n E2 6 0 VALUE={V(5)} R4 6 7 1k C3 7 0 100n E3 8 0 VALUE={V(7)} .ends This model includes the basic components of the TL494, including the voltage reference, error amplifier, and PWM comparator.

.tran 1u 10m This directive tells LTspice to perform a transient analysis of the circuit from 0 to 10ms with a time step of 1μs.