TL494 is a fixed frequency pulse width modulation control circuit designed primarily for SWITCHMODE power supply control.It features complete pulse width modulation control circuitry, on-chip oscillator with master or slave operation, on-chip error amplifiers, on-chip 5.0V reference, adjustable deadtime control, output control for push-pull or single-ended operation, undervoltage lockout, etc.
The TL494 and NCV494 are fixed‑frequency pulse‑width‑modulation control circuits intended for switching‑mode power‑supply applications. The device integrates an on‑chip oscillator, error amplifiers, a 5 V reference, adjustable dead‑time control and uncommitted output transistors rated up to 500 mA.
The datasheet provides electrical characteristics, maximum ratings, recommended operating conditions, package options and ordering information, along with application notes on oscillator frequency calculation and dead‑time control.
| Power Supply Voltage (Vcc) Range | 7 V – 40 V |
|---|---|
| Collector Output Voltage (Vout) Range | 0 V – 40 V |
| Maximum Output Current per Transistor | 500 mA |
| Oscillator Frequency Range | 1 kHz – 200 kHz |
| Reference Voltage | 5.0 V (±5 %) |
Each output transistor is rated for up to 500 mA source or sink current.
The oscillator can be programmed to operate between 1 kHz and 200 kHz.
The device operates with a supply voltage from 7 V up to 40 V.
Yes, Pb‑free (lead‑free) packages are offered for both TL494 and NCV494.