In a functional analysis, the diagram shows that the capacitor CT is charged by the current through RT and discharged internally. This creates a sawtooth waveform on the timing capacitor. This waveform is the timing clock for the PWM. It feeds into the comparator section, establishing the "ramp" against which the control voltage is compared. The visual simplicity of two pins on the diagram belies the complex timing generation that dictates the switching speed of the entire power supply.
Have you built a circuit using the TL494? Share your experience or questions in the comments below. tl494 circuit diagram
Pin 14 provides a very stable 5.0V output. Use this for your feedback dividers rather than the raw VCC to ensure accuracy. In a functional analysis, the diagram shows that
The most intricate part of the TL494 circuit diagram involves the two error amplifiers (Pins 1, 2, 15, 16) and the feedback pin (Pin 3). In the schematic block diagram, these are represented as triangular op-amp symbols. It feeds into the comparator section, establishing the
Used for single-ended designs (like a basic buck converter).
Because the TL494 can operate from 7V up to 40V, it is found in a wide variety of electronics: TL494 Pulse-Width-Modulation Control Circuits