Alternate outputs on each oscillator half-cycle SAMPLE1 131 0 132 0 SW SAMPLE2 133 0 132 0 SW .MODEL SW VSWITCH(Ron=1 Roff=1G Vt=2.5 Vh=0.1)
* TL494.sub * Connections: 1IN+ 1IN- FB DTC CT RT GND C1 E1 E2 C2 VCC OC REF 2IN- 2IN+ .subckt tl494 1IN+ 1IN- FB DTC CT RT GND C1 E1 E2 C2 VCC OC REF 2IN- 2IN+ [SPICE model code omitted for brevity; see references [1, 3] for full listing] .ends tl494 Use code with caution. Copied to clipboard 2. Implementation Steps
For most educational and prototyping purposes, it works well.
: A widely cited model can be found on this forum thread . 2. Import the Model into LTspice
Observe the output at the emitter/collector pins to verify that the PWM duty cycle adjusts based on the feedback loop. Oscillator Check: Measure the voltage at CTcap C sub cap T
). Without this, the ramp may be distorted, leading to incorrect PWM behavior. :
Alternate outputs on each oscillator half-cycle SAMPLE1 131 0 132 0 SW SAMPLE2 133 0 132 0 SW .MODEL SW VSWITCH(Ron=1 Roff=1G Vt=2.5 Vh=0.1)
* TL494.sub * Connections: 1IN+ 1IN- FB DTC CT RT GND C1 E1 E2 C2 VCC OC REF 2IN- 2IN+ .subckt tl494 1IN+ 1IN- FB DTC CT RT GND C1 E1 E2 C2 VCC OC REF 2IN- 2IN+ [SPICE model code omitted for brevity; see references [1, 3] for full listing] .ends tl494 Use code with caution. Copied to clipboard 2. Implementation Steps tl494 ltspice
For most educational and prototyping purposes, it works well. Alternate outputs on each oscillator half-cycle SAMPLE1 131
: A widely cited model can be found on this forum thread . 2. Import the Model into LTspice : A widely cited model can be found on this forum thread
Observe the output at the emitter/collector pins to verify that the PWM duty cycle adjusts based on the feedback loop. Oscillator Check: Measure the voltage at CTcap C sub cap T
). Without this, the ramp may be distorted, leading to incorrect PWM behavior. :
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