!link! | Tl494 Ltspice

Connect Pin 4 directly to GND.

LTSpice doesn’t include a built-in TL494 device, so you have three realistic options:

To properly interpret LTspice waveforms, you must understand how the internal logical macro-blocks behave under simulation. The 16-pin layout of the TL494 features a highly symmetrical structure: tl494 ltspice

Probe the output pin (Pin 9 or 10) and the switching node. You should see a PWM square wave

The frequency of the internal oscillator is set by the classic formula: Connect Pin 4 directly to GND

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: Provides a fixed or adjustable offset to prevent output overlap. You should see a PWM square wave The

* Output Transistors (Pins 8,9,10,11) * Q1 (Pins 8 Coll, 9 Emit) * Q2 (Pins 10 Coll, 11 Emit) S1 8 9 101 0 SW S2 10 11 101 0 SW

The PWM duty cycle is determined by comparing the control voltage on the FB pin (pin 3) with the sawtooth waveform on the dead-time comparator. As the voltage on pin 3 increases from 0.5V to 3.5V, the duty cycle can vary from 0% to nearly 100%.