Tl494 Circuit Diagram -

| Frequency | R_T (pin 6) | C_T (pin 5) | |-----------|-------------|-------------| | 20 kHz | 30 kΩ | 2.2 nF | | 50 kHz | 10 kΩ | 2.2 nF | | 100 kHz | 5.1 kΩ | 2.2 nF | | 200 kHz | 2.7 kΩ | 1 nF |

The TL494 is a fixed-frequency, pulse-width modulation (PWM) control IC, widely used in switching power supplies, DC-DC converters, battery chargers, and inverters. Understanding its circuit diagram is essential for designing efficient power electronics. tl494 circuit diagram

A basic step-down converter using TL494: | Frequency | R_T (pin 6) | C_T

Simplified circuit connections:

| Pin | Name | Description | |-----|--------------|-------------| | 1 | 1IN+ | Non‑inverting input of error amp 1 | | 2 | 1IN‑ | Inverting input of error amp 1 | | 3 | FEEDBACK | PWM comparator input (usually from error amp output) | | 4 | DTC | Dead‑time control (0V to 3V, higher = more dead time) | | 5 | CT | Timing capacitor (to GND) | | 6 | RT | Timing resistor (to GND) | | 7 | GND | Ground | | 8 | C1 | Collector of output transistor 1 | | 9 | E1 | Emitter of output transistor 1 | | 10 | E2 | Emitter of output transistor 2 | | 11 | C2 | Collector of output transistor 2 | | 12 | VCC | Supply voltage (7V to 40V) | | 13 | OUTPUT CTRL | Output mode control: to GND = parallel mode; to REF = push‑pull mode | | 14 | REF | 5V reference output (max 10 mA) | | 15 | 2IN‑ | Inverting input of error amp 2 | | 16 | 2IN+ | Non‑inverting input of error amp 2 | Simplified circuit connections: | Pin | Name |

Even with a perfect TL494 circuit diagram, beginners fail for these reasons:

This buck regulator maintains a stable 5V output regardless of input variations or load changes.