The TL494 is a fixed frequency pulse width modulation control circuit designed primarily for SWITCHMODE power supply control. It has complete pulse width modulation control circuitry, on-chip oscillator, on-chip error amplifiers, on-chip 5.0 V reference, adjustable deadtime control, uncommitted output transistors rated to 500 mA source or sink, output control for push-pull or single-ended operation and undervoltage lockout.
The TL494 and its automotive‑grade variant NCV494 are fixed‑frequency pulse‑width‑modulation control ICs designed for switching power supplies. The device includes an on‑chip oscillator, error amplifiers, a 5.0 V reference and configurable output stages for push‑pull or single‑ended operation.
The datasheet provides maximum ratings, recommended operating conditions, detailed electrical characteristics, pin descriptions, package dimensions (PDIP‑16) and ordering information for both standard and automotive versions.
| Power Supply Voltage (Voc) – Typical | 15 V |
|---|---|
| Collector Output Voltage (Vo2) – Typical | 30 V |
| Maximum Output Current per Transistor | 500 mA |
| Oscillator Frequency – Typical | 40 kHz |
| Power Dissipation (Pp) – Max | 1000 mW |
| Internal Reference Voltage | 5.0 V |
Each output transistor is rated for up to 500 mA.
The typical oscillator frequency is 40 kHz.
The TL494 is supplied in a PDIP‑16 package.
The IC contains an on‑chip 5.0 V reference.