UCC2818DG4

Overview

The UCC2818DG4 is a BiCMOS power factor preregulator designed for critical conduction mode (CrM) operation. It integrates a high-voltage startup circuit, a voltage error amplifier, and a current sense comparator. The device operates with a fixed switching frequency of 250 kHz and supports an input voltage range suitable for universal AC mains. It features cycle-by-cycle peak current limiting and adjustable soft-start capabilities to manage inrush currents. The component is housed in a 16-pin SOIC-Narrow package and is qualified for automotive applications under AEC-Q100 standards.

Feature Summary

• Integrates a high-voltage startup circuit to eliminate external start-up resistors
• Provides cycle-by-cycle peak current limiting for robust protection
• Supports critical conduction mode operation for improved efficiency at light loads

Applications

• Universal AC-DC power supplies
• Power factor correction stages in consumer electronics
• Automotive infotainment systems requiring PFC

Procurement Notes

Verify the specific suffix 'DG4' indicates lead-free and RoHS compliance as per Texas Instruments documentation. Confirm the package type matches the design requirements, as it is supplied in tube packaging. Ensure the ordering part number aligns with the intended automotive qualification level if required for the final assembly.

Selection Notes

Select this component when designing a cost-effective power factor correction stage that requires integrated startup functionality. It is suitable for applications where critical conduction mode operation provides sufficient performance without the complexity of continuous conduction mode controllers. Verify compatibility with the downstream converter topology.

Part Context

This part belongs to the UCC2818A family of power factor preregulators from Texas Instruments. It is the lead-free, RoHS-compliant variant of the UCC2818D. The device is categorized under Power Management ICs specifically for Power Factor Correction. It serves as a standalone controller for the PFC stage in multi-stage power supply designs.

Replacement Considerations

The UCC2818AQDRQ1 is a qualified automotive alternative within the same family. Check pinout compatibility and electrical specifications before substitution. Other members of the UCC2818 series may offer different packaging or temperature ranges.