UCC28634DR

AC DC Converters, Offline Switchers Overview

The UCC28634DR is a high-power flyback controller from Texas Instruments, designed for offline AC/DC conversion applications. It features primary-side regulation (PSR) to eliminate optocouplers and secondary sense windings. The device operates in peak power mode with an adjustable constant current limit and frequency dithering capabilities. It is housed in a 7-pin SOIC package and supports a switching frequency range of 200 Hz to 120 kHz. The component is rated for a junction temperature range of -40°C to 125°C.

AC DC Converters, Offline Switchers Feature Summary

• Integrates primary-side regulation to simplify transformer design and reduce component count by removing the need for optocouplers.
• Supports peak power mode operation with adjustable constant current limits for precise output control.
• Includes frequency dithering functionality to minimize electromagnetic interference (EMI) noise.

AC DC Converters, Offline Switchers Applications

• High-power offline flyback power supplies
• AC/DC converters requiring primary-side regulation
• Adapters and chargers with strict EMI requirements

AC DC Converters, Offline Switchers Procurement Notes

Verify the specific suffix 'DR' indicates the tape-and-reel packaging format when ordering. Confirm that the 7-SOIC footprint matches your PCB layout constraints. Ensure the design accommodates the specified operating temperature range of -40°C to 125°C. Cross-reference the datasheet for exact pinout definitions before finalizing the schematic.

AC DC Converters, Offline Switchers Selection Notes

Select this component for designs prioritizing cost reduction through primary-side regulation. It is suitable for applications where isolation feedback is undesirable or impractical. Consider the 7-SOIC package size for space-constrained boards. Evaluate the frequency dithering benefits if EMI compliance is a critical design parameter.

AC DC Converters, Offline Switchers Part Context

This part belongs to the UCC2863x family of high-performance flyback controllers. It shares functional similarities with other PSR-enabled devices but offers specific adjustments for constant current limits and frequency modulation. The DR suffix denotes the reel packaging variant, distinct from the tube-packaged 'D' version.

AC DC Converters, Offline Switchers Replacement Considerations

Direct substitutes may include other Texas Instruments PSR flyback controllers such as the UCC28631 or UCC28632, provided they meet the same voltage and current specifications. Verify pin compatibility and thermal performance before substitution.