UCC28221DG4

AC DC Converters, Offline Switchers Overview

The UCC28221DG4 is a dual interleaved PWM controller designed for high-performance power factor correction (PFC) pre-regulators. It operates with two phases to reduce input current ripple and improve efficiency. The device features a programmable maximum duty cycle, allowing optimization for various transformer designs. It supports switching frequencies up to 2 MHz, enabling the use of smaller magnetics. Integrated protection mechanisms include undervoltage lockout and thermal shutdown. The component is housed in an 8-pin SOIC package and operates within a temperature range of -40°C to +105°C.

AC DC Converters, Offline Switchers Feature Summary

• Dual interleaved architecture reduces input current ripple and improves transient response
• Programmable maximum duty cycle allows flexibility in transformer design
• High-frequency operation capability supports compact magnetic component sizing
• Integrated protection features ensure reliable operation under fault conditions

AC DC Converters, Offline Switchers Applications

• Two-phase interleaved PFC pre-regulators
• High-efficiency AC/DC power supplies
• Server and storage power systems
• Telecommunications power modules

AC DC Converters, Offline Switchers Procurement Notes

Verify the exact ordering suffix to confirm package type and tape/reel specifications. Ensure compatibility with existing PCB footprints for the SOIC-8 package. Confirm RoHS compliance status if required by specific environmental regulations. Check for any recent product change notifications that may affect pinout or electrical characteristics before finalizing procurement.

AC DC Converters, Offline Switchers Selection Notes

Select this controller when designing interleaved PFC stages requiring reduced input ripple. Consider the programmable duty cycle feature for optimizing transformer utilization. Evaluate the 2 MHz switching frequency capability against EMI constraints and magnetic core losses. Compare with single-phase controllers if size reduction is prioritized over ripple cancellation.

AC DC Converters, Offline Switchers Part Context

The UCC28221 belongs to Texas Instruments' UCC2822x family of dual interleaved PWM controllers. This series is specifically engineered for high-power density applications where input current ripple reduction is critical. The DG4 variant indicates a lead-free, halogen-free version compliant with RoHS standards. It complements other TI power management solutions for complete AC/DC conversion systems.

AC DC Converters, Offline Switchers Replacement Considerations

UCC28221PW serves as a pin-compatible alternative in a TSSOP package. UCC28220 offers similar functionality but may have different electrical characteristics. Verify pinout compatibility and thermal performance when substituting. Review datasheet differences for switching frequency limits and protection thresholds.