[ f_osc = \frac1R_T \cdot C_T ]
is a staple in the world of power electronics. Whether you're building a custom inverter or a high-efficiency bench power supply, this fixed-frequency Pulse Width Modulation (PWM)
: The internal oscillator's frequency can be set between 1 kHz and 300 kHz using an external resistor ( cap R sub cap T ) and capacitor ( cap C sub cap T Precision 5V Reference tl494 circuit diagram
+12V ──┬────────────────────┐ │ │ ┌┴┐ │ │ │ 10k │ └┬┘ │ │ │ └──────┬─────────────┼─── VCC (pin 12) │ │ 0.1µF │ │ │ GND │ │ +12V ────┬──────────────────┤ │ │ ┌┴┐ 1N5819 │ │ │ (Schottky) │ └┬┘ │ │ │ └────┐ │ │ │ │ └─────┐ │ │ │ │ │ L1 ─┴─ │ 10µH ─┬─ │ │ │ │ │ C2 │ │ 100µF │ │ │ │ │ GND │ │ │ └─────┬──────┘ │ Vout (5V)
This is the most straightforward circuit to test the IC and generate a variable-duty-cycle PWM signal. [ f_osc = \frac1R_T \cdot C_T ] is
If you are looking to understand or design a circuit using the TL494, this guide breaks down its internal architecture, pin configuration, and two essential circuit diagrams.
The TL494 is a voltage-mode PWM control IC designed for switching power supplies. It features a totem-pole output stage, which can source or sink high currents, making it suitable for driving power MOSFETs or IGBTs. The TL494 is widely used in various power supply applications, including flyback converters, forward converters, and half-bridge converters. The TL494 is a voltage-mode PWM control IC
ceramic capacitor close to to filter out high-frequency switching noise.