UCC2805PW

Overview

The UCC2805PW is a current-mode PWM controller designed for high-performance power factor correction (PFC) applications. It integrates a precision analog multiplier, error amplifier, and oscillator to achieve unity power factor operation. The device supports continuous conduction mode (CCM) boost converters with fixed-frequency operation up to 150 kHz. Key electrical characteristics include a wide input voltage range for the error amplifier and a built-in soft-start mechanism to limit inrush current during startup.

Feature Summary

• Integrates a high-precision analog multiplier for accurate line regulation and power factor correction
• Features a robust current-mode control architecture with cycle-by-cycle peak current limiting
• Includes an internal oscillator with external timing resistor capability for flexible frequency selection

Applications

• Active power factor correction stages in AC-DC adapters
• High-efficiency desktop computer power supplies
• Telecommunications power systems requiring PFC compliance

Procurement Notes

Verify the package type matches your PCB footprint requirements. Confirm that the operating temperature range meets your system specifications. Ensure compatibility with your chosen inductor and capacitor values for stable loop compensation. Check for any specific ordering suffixes that may indicate tape-and-reel packaging versus tube quantities if applicable to your manufacturing process.

Selection Notes

Select this component when designing CCM boost PFC converters requiring integrated multiplier functionality. Consider the SOIC-16 package constraints for thermal management and board space. Evaluate the need for external compensation components based on the desired crossover frequency and phase margin. Compare against other TI controllers if variable frequency operation or different package options are required.

Part Context

The UCC2805 belongs to Texas Instruments' legacy UC3854-compatible family of power factor correction controllers. It serves as a direct functional replacement for older generation PFC ICs while offering improved accuracy and integration. This part is widely used in industrial and consumer electronics where strict harmonic distortion limits must be met according to international standards such as IEC 61000-3-2.

Replacement Considerations

The UCC2805N is the equivalent leaded DIP-16 version of this surface-mount component. Designers transitioning from through-hole to surface-mount should verify pinout compatibility and thermal dissipation differences between the PW and N packages.