Texas Instruments UCC3809P-1 Economy Primary Side Controller

The Texas Instruments UCC3809P-1 is a versatile and efficient economy primary side controller designed for off-line power supplies. This integrated circuit (IC) is part of the UCC3809 family and is particularly well-suited for applications requiring power factor correction and tight output regulation, such as consumer electronics, small appliances, and industrial systems.

Key Features:

• Programmable Switching Frequency: The UCC3809P-1 allows for a programmable switching frequency that can be set from 4kHz to 1MHz, offering design flexibility to optimize for efficiency and component size.
• Peak Current Mode Control: This feature provides inherent cycle-by-cycle current limiting, which enhances the protection of the power supply and improves reliability.
• Low Startup and Operating Current: The device has a low startup current of 0.5µA and a low operating current of 2.5mA, contributing to the overall efficiency of the power supply.
• Soft Start: The UCC3809P-1 includes a soft-start function to minimize stress on the power supply during startup, extending the life of the components.
• Trimmed Oscillator Discharge Current: Ensures consistent and accurate timing for each cycle, which leads to stable operation across different loads and input voltages.
• Under-Voltage Lockout (UVLO): The UVLO feature ensures that the controller operates at the correct voltage level, protecting the circuitry and enhancing safety.

Applications:

The UCC3809P-1 is ideal for a wide range of applications, including:

• AC-DC Adapters
• Offline Power Supplies
• Power Factor Correction (PFC) Pre-Regulators
• Consumer Electronics
• Small Appliances
• Industrial Systems

Package and Availability:

The UCC3809P-1 is available in an 8-pin PDIP (Plastic Dual-In-Line Package) that is RoHS compliant and suited for through-hole mounting. Texas Instruments supports this product with comprehensive technical documentation, including datasheets, application notes, and design resources to assist engineers in integrating this controller into their designs.