UCC2804D/81221

Overview

The UCC2804D is a high-performance current-mode PWM controller designed for power factor correction (PFC) and flyback applications. It operates with a fixed switching frequency of 1 MHz, supporting Boost, Flyback, and Forward topologies. The device features a maximum duty cycle of 50% and an internal oscillator. It functions within a supply voltage range of 8.3V to 12V, with a maximum input voltage of 12V. The component is housed in an SOIC-8 surface-mount package, rated for operation between -40°C and 85°C, with a dissipation power of 650 mW.

Feature Summary

• Integrated high-frequency oscillator for compact passive component sizing
• Current-mode control architecture for improved transient response
• Built-in protection mechanisms including undervoltage lockout

Applications

• Power Factor Correction (PFC) circuits
• Flyback converters
• Forward converters

Procurement Notes

Verify the specific suffix against official Texas Instruments documentation to confirm exact tape-and-reel quantities or temperature grades. Ensure the ordering part number matches the required package variant and industrial specifications. Cross-reference the manufacturer's latest datasheet to validate active status and compliance certifications before finalizing procurement orders.

Selection Notes

Select this component for designs requiring high-density power conversion due to its 1 MHz operating frequency. It is suitable for applications needing precise current-mode control and a strict 50% duty cycle limit. Consider the SOIC-8 package constraints and thermal dissipation capabilities when designing the PCB layout for optimal performance.

Part Context

This part belongs to the UCC280x series of power factor correction controllers from Texas Instruments. These devices are engineered to meet regulatory standards for harmonic distortion while maintaining high efficiency. The series typically integrates essential PFC functions into a single chip, simplifying design complexity for AC-DC power supplies.

Replacement Considerations

Consult official substitution lists for direct pin-compatible alternatives such as the UCC2805 or UCC2806 series. Verify that any substitute maintains the same 1 MHz frequency and current-mode control characteristics to ensure circuit compatibility.