The U2480B is a bipolar integrated circuit manufactured by TEMIC Semiconductors (now Vishay). It's designed as a phase control IC for universal motor speed control and light dimming applications. This IC offers features like burst firing and soft-start to enhance performance and reduce noise.

Applications

• Universal motor speed control (e.g., in power tools, appliances)
• Light dimming applications (e.g., incandescent, halogen lamps)
• Heater control
• Fan speed control

Features

• Phase control operation
• Burst firing mode for low speed/dimming
• Soft-start functionality to prevent inrush current
• Hysteresis for stable operation
• Integrated overvoltage protection
• Few external components required

Benefits

• Precise speed/dimming control for various loads.
• Reduces audible noise at low speeds/dimming levels.
• Extends the lifespan of connected loads by preventing inrush current damage.
• Stable and flicker-free operation even with fluctuating loads.
• Protects the IC from damage due to voltage spikes.
• Simplifies circuit design and reduces overall cost.

Technical Specifications

The U2480B typically operates from a supply voltage of 230V AC. It provides a controlled output trigger pulse for driving a triac or thyristor. Refer to the official Vishay/TEMIC datasheet for U2480B for precise electrical characteristics, timing diagrams, and recommended external component values.

The IC incorporates internal logic to generate the firing angle based on an external control voltage. The soft-start function gradually increases the firing angle to prevent sudden changes in load current. The burst firing mode switches the load on and off in short bursts to achieve very low power levels.