UCC28911DR

AC DC Converters, Offline Switchers Overview

The UCC28911DR is a current-mode active clamp flyback controller from Texas Instruments, designed for offline AC/DC power supplies. It supports input voltages from 85 VAC to 265 VAC and delivers up to 1.5 A output current at 5 V. The device operates with a switching frequency range of 420 Hz to 130 kHz and features a maximum duty cycle of 73%. Packaged in an SOIC-16 (Narrow) surface-mount case, it functions within a temperature range of -40°C to +85°C.

AC DC Converters, Offline Switchers Feature Summary

• Integrates active clamp functionality to reduce switch voltage stress and improve efficiency.
• Supports primary-side regulation for simplified optocoupler-less designs.
• Includes comprehensive protection mechanisms against overcurrent, overvoltage, and thermal faults.

AC DC Converters, Offline Switchers Applications

• Offline AC/DC power supplies
• Flyback converter topologies
• Primary-side regulated power adapters

AC DC Converters, Offline Switchers Procurement Notes

Verify the specific suffix 'DR' corresponds to the SOIC-16 package and tape-and-reel quantity when ordering. Confirm that the intended application aligns with the specified 130 kHz maximum switching frequency and 73% duty cycle limits. Ensure the design accommodates the -40°C to +85°C operating temperature range. Cross-reference the datasheet for exact pinout compatibility with existing layouts.

AC DC Converters, Offline Switchers Selection Notes

Select this component for applications requiring integrated active clamp control in a compact SOIC-16 footprint. It is suitable for designs prioritizing primary-side regulation to minimize component count. Consider the 130 kHz frequency limit for transformer sizing and EMI filtering requirements. Evaluate the 1.5 A output capability against load demands to ensure adequate performance margins.

AC DC Converters, Offline Switchers Part Context

The UCC28911 belongs to the UCC2891x family of active clamp flyback controllers. It shares functional similarities with the UCC28910 but offers distinct configuration options. This series targets cost-sensitive, high-efficiency offline power supply applications where size and component count are critical constraints.

AC DC Converters, Offline Switchers Replacement Considerations

UCC28910DR serves as a direct functional substitute within the same family. Verify pinout compatibility and parameter alignment before substitution.

AC DC Converters, Offline Switchers FAQ

What is the maximum switching frequency?

The maximum switching frequency is 130 kHz.

Does the device support primary-side regulation?

Yes, the UCC28911 supports primary-side regulation to eliminate the need for an optocoupler.