The TL494 device incorporates all the functions required in the construction of a pulse-width-modulation (PWM) control circuit on a single chip. Designed primarily for power-supply control, this device offers the flexibility to tailor the power-supply control circuitry to a specific application.
The TL494 device contains two error amplifiers, an on-chip adjustable oscillator, a dead-time control (DTC) comparator, a pulse-steering control flip-flop, a 5-V, 5%-precision regulator, and output-control circuits.
The error amplifiers exhibit a common-mode voltage range from –0.3 V to VCC – 2 V. The dead-time control comparator has a fixed offset that provides approximately 5% dead time. The on-chip oscillator can be bypassed by terminating RT to the reference output and providing a sawtooth input to CT, or it can drive the common circuits in synchronous multiple-rail power supplies.
The uncommitted output transistors provide either common-emitter or emitter-follower output capability. The TL494 device provides for push-pull or single-ended output operation, which can be selected through the output-control function. The architecture of this device prohibits the possibility of either output being pulsed twice during push-pull operation.
The TL494 device is characterized for operation from 0°C to 70°C. The TL494I device is characterized for operation from –40°C to 85°C.
| Type | Title | Date | ||
|---|---|---|---|---|
| * | Data sheet | TL494 Pulse-Width-Modulation Control Circuits datasheet (Rev. I) | PDF | HTML | 08 Jul 2022 |
| Application note | Understanding Inverting Buck-Boost Power Stages in Switch Mode Power Supplies (Rev. B) | 12 Mar 2019 | ||
| Selection guide | Power Management Guide 2018 (Rev. R) | 25 Jun 2018 | ||
| Technical article | Using error amplifiers to remove error and variance | PDF | HTML | 16 Feb 2016 | |
| Application note | Isolated Multiple Output Flyback Converter Design Using TL494 | 18 Jun 2014 | ||
| Application note | Designing Switching Voltage Regulators With the TL494 (Rev. E) | 26 Jul 2005 | ||
| Application note | Off-Line SMPS Failure Modes PWM Switchers and DC-DC Converters | 22 Mar 2000 | ||
| Application note | Understanding Boost Power Stages In Switchmode Power Supplies | 04 Mar 1999 | ||
| Application note | Understanding Buck Power Stages In Switchmode Power Supplies | 04 Mar 1999 |
For additional terms or required resources, click any title below to view the detail page where available.
| Package | Pins | CAD symbols, footprints & 3D models |
|---|---|---|
| PDIP (N) | 16 | Ultra Librarian |
| SOIC (D) | 16 | Ultra Librarian |
| SOP (NS) | 16 | Ultra Librarian |
| TSSOP (PW) | 16 | Ultra Librarian |
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