UCC3817N

Overview

The UCC3817N is a BiCMOS power factor preregulator controller designed for high-performance AC-DC conversion. It integrates a current-mode PWM controller with a multiplier and error amplifier to achieve unity power factor operation. The device operates within a temperature range of 0°C to 70°C and utilizes a 16-pin SOIC package. Key electrical characteristics include an internal oscillator, soft-start capability, and undervoltage lockout features, ensuring stable performance in universal input applications.

Feature Summary

• Integrates a high-gain multiplier and error amplifier for precise power factor correction
• Features current-mode control architecture for improved line regulation and transient response
• Includes built-in soft-start circuitry to limit inrush current during startup
• Provides undervoltage lockout protection to prevent operation under insufficient supply conditions

Applications

• Universal input AC-DC power supplies
• Power factor correction (PFC) preregulators
• High-efficiency offline switching power converters
• Computer and peripheral power supplies

Procurement Notes

Verify the specific suffix designation against the manufacturer's official datasheet to confirm pinout compatibility and thermal specifications. Ensure the selected variant matches the required operating temperature range and packaging type for your design. Cross-reference ordering information with authorized distributors to confirm availability and authenticity.

Selection Notes

Select this component for designs requiring integrated PFC functionality without external multipliers. Evaluate the thermal performance requirements of the SOIC package relative to the expected power dissipation. Consider the operating frequency range and ensure external passive components are rated for the intended switching speeds and voltage levels.

Part Context

This device belongs to the UCC3817 family of power factor correction controllers from Texas Instruments. It is part of a broader portfolio of analog control ICs focused on efficient power management solutions. The family shares common architectural principles but varies in package options and specific feature sets to address diverse industrial and commercial power supply needs.

Replacement Considerations

Check for direct equivalents such as the UCC3817AD or UCC3817ADG4 which share identical functional descriptions and pinouts. Verify that any substitute maintains the same BiCMOS technology and SOIC package dimensions to ensure mechanical fit.