UCC28056DBVT

Overview

The UCC28056DBVT is a six-pin power factor correction controller from Texas Instruments, housed in an SOT-23 package. It operates within a temperature range of -40°C to +125°C and draws a supply current of 46 µA. The device supports a wide VCC range from 8.5V to 34V and features integrated overtemperature protection with second independent output voltage protection.

Feature Summary

• Implements a hybrid mode approach transitioning from transition mode at full load to discontinuous conduction mode at lower loads to automatically reduce switching frequency.
• Maintains continuous PFC operation via burst mode with soft entry and exit periods to meet stringent energy standards without disabling the PFC stage.
• Provides immediate on functionality to minimize external component requirements while ensuring low input current distortion and high power factor.
• Includes valley synchronization capabilities without requiring a secondary winding on the boost inductor, featuring user-adjustable valley delay.

Applications

• Desktop computers
• Digital televisions
• Game consoles
• Set-top boxes
• Entry-level servers and network servers

Procurement Notes

Verify the specific suffix DBVT corresponds to the SOT-23-6 package configuration during procurement. Confirm that the ordering part number matches the required reel or cut tape specifications for your assembly line. Ensure compatibility with the intended operating temperature range of negative forty degrees Celsius to one hundred twenty-five degrees Celsius before finalizing purchase orders.

Selection Notes

Select this component for designs requiring high performance in compact spaces due to its small footprint. It is suitable for applications needing compliance with EuP Lot 6 and CoC Version 5 Level 2 standards. Consider pairing with LLC controllers like the UCC256301 to eliminate auxiliary flyback converters. Evaluate the need for valley synchronization features to optimize efficiency across varying load conditions.

Part Context

This part belongs to the UCC28056 series of power factor correction controllers designed for high-efficiency AC-DC conversion. It serves as a critical component in modern power supplies aiming to reduce electromagnetic interference and improve overall system efficiency through advanced control algorithms.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation. Verify pinout and functional compatibility with existing designs if considering alternative PFC controllers from other manufacturers.

FAQ

How does the UCC28056 handle light load conditions?

It transitions smoothly from transition mode to discontinuous conduction mode and utilizes burst mode with soft entry and exit to maintain high efficiency and meet energy standards without turning off the PFC.

Is a secondary winding required on the boost inductor for valley sync?

No, the device allows for valley synchronization without requiring a second winding on the boost inductor, simplifying the magnetic design.