onsemi

TL494CN

TL494CN Description

The TL494CN by onsemi is a versatile pulse-width modulation (PWM) controller IC designed for switch-mode power supply (SMPS) applications. Housed in a 16-pin DIP package, it operates as a transistor driver with a positive output configuration, making it suitable for buck, boost, and push-pull converter topologies. With a wide supply voltage range of 7V to 40V, it supports high-frequency switching up to 200kHz, ensuring efficient power conversion. The device is part of the SWITCHMODE™ series, optimized for precision control in power management systems. Although marked as obsolete, it remains a reliable choice for legacy designs due to its robust performance and REACH compliance.

TL494CN Features

• Dual Outputs: Two transistor drivers enable flexible push-pull or single-ended configurations.
• Adjustable Dead Time Control: Minimizes shoot-through currents in half-bridge or full-bridge designs.
• Frequency Control: External RC network allows customizable switching frequency up to 200kHz.
• Synchronous Rectification Support: Enhances efficiency in high-current applications.
• 48% Max Duty Cycle: Ensures safe operation with built-in pulse-width limiting.
• Wide Operating Temperature (0°C to 70°C): Reliable performance in industrial environments.
• Through-Hole Mounting: Simplifies prototyping and legacy system integration.

TL494CN Applications

• DC-DC Converters: Ideal for buck/boost regulators in telecom and automotive systems.
• Uninterruptible Power Supplies (UPS): Provides stable PWM control for battery backup units.
• Inverters and Motor Drives: Suitable for H-bridge motor control and AC power generation.
• Industrial SMPS: Used in high-efficiency power supplies for factory automation.
• Legacy Electronics Repair: A go-to solution for maintaining older equipment due to its proven reliability.

Conclusion of TL494CN

The TL494CN stands out for its flexibility, precision, and ruggedness in power management applications. While newer alternatives exist, its dead-time control, synchronous rectification support, and wide voltage range make it a preferred choice for engineers working on retrofit designs or cost-sensitive projects. Its obsolete status may limit new designs, but its performance legacy ensures continued relevance in niche markets.