Tl494 Ltspice !!exclusive!! -

Simulating the TL494 in LTspice is a "right of passage" for anyone designing push-pull, half-bridge, or full-bridge converters. Since the TL494 isn't always in the native LTspice library, users typically rely on third-party models (like those from The Pros: Why It’s Useful High Control Granularity

* Error Amplifiers (Simplified) * EAMP1 (Pins 1, 2, 3) E1 3 7 TABLE V(1,2) = (0 0) (1m 5) * EAMP2 (Pins 15, 16) E2 3 7 TABLE V(15,16) = (0 0) (1m 5) 
* TL494 Behavioral Model for LTspice
.SUBCKT TL494 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
* Pins: 1(IN1+) 2(IN1-) 3(FB) 4(DT) 5(CT) 6(RT) 7(GND) 8(C1) 9(E1) 10(C2) 11(E2) 12(VCC) 13(OUT_CTRL) 14(VREF) 15(IN2+) 16(IN2-)

Clock divider (toggle)
E_CLK 132 0 VALUE PULSE(0,5,0,1n,1n,10u,20u) ; placeholder freq adjust tl494 ltspice


    

  • FB: Feedback pin (connected to output voltage divider)
    • 

  • EAOUT: Error amplifier output
    • 

  • COMP: Compensation pin
    • 

  • RT: Timing resistor (e.g., 10k)
    • 

  • CT: Timing capacitor (e.g., 1nF)
    • 

  • VCC: Supply voltage (e.g., 12V)
    • 



.SUBCKT TL494 1 2 3 4 5 6 7 8 9 10 11 12 13 14 Simulating the TL494 in LTspice is a "right


2.4 Output Control (Pin 13)


This pin dictates the output topology:


.tran 0 5m 0 1u startup
.options method=gear
.lib TL494.sub