Tl494 Circuit Diagram -

Below are three practical schematics. Component values are included for common frequencies (typically 50kHz to 100kHz).

This is a practical power supply circuit: 12V to 5V @ 2A. tl494 circuit diagram

                     +12V ──┬───┐
                           │   │
                           │   C1 ── 0.1µF
                           │   │
                           └───┴─── GND
                           │
                        ┌──┴──┐
                        │     │
                        │ TL494│
                        │     │
                        └──┬──┘
                           │
    RT ── 47kΩ ──┬──── Pin6 │
                 │         │
    CT ── 10nF ──┴──── Pin5 │
                           │
    DTC ── Pin4 ── 0.01µF ─┴─ GND
                           │
    VCC ── Pin12 ── +12V   │
    GND ── Pin7  ─── GND   │
    REF ── Pin14 ── 5V ────┤
                           │
    Output Ctrl ── Pin13 ── GND  (parallel mode)
                           │
    C1 ── Pin8 ──┬─── 1N4148 ──┬─── L1 ──┬─── C_out ── GND
                 │             │         │
    E1 ── Pin9 ──┤             │         │
                 │             │         │
    C2 ── Pin11 ─┤             │         │
                 │             │         │
    E2 ── Pin10 ─┴─── 1N4148 ──┘         │
                                         │
    Feedback network:                    │
    R1 = 2.2kΩ ──┬─── Pin1 (1IN+)       │
                 │                       │
    R2 = 10kΩ  ──┴─── GND                │
                                         │
    Pin2 (1IN‑) ──┬─── R3 = 1kΩ ── GND  │
                  │                      │
                  └─── R4 = 10kΩ ────────┘ (to output voltage)
                                         │
    Pin3 (FEEDBACK) ── C_comp = 1nF ──┬─── R_comp = 10kΩ ── Pin1
                                      │
                                      └─── GND

(Note: This is a simplified schematic – for a real PCB, include gate drive resistors, bypass caps, and snubbers.) Below are three practical schematics

Use a current sense resistor (e.g., 0.1Ω) between load and GND. Connect its voltage to Pin16 (2IN+). Set Pin15 (2IN‑) to desired limit voltage (e.g., 0.3V). When limit exceeded, PWM duty reduces. (Note: This is a simplified schematic – for

Connect a capacitor (10µF) and resistor (100kΩ) in series from REF to DTC (Pin4). Initially DTC voltage rises slowly, limiting duty cycle.