LNK6428E

AC DC Converters, Offline Switchers Overview

The LNK6428E is an AC/DC converter IC from the LinkSwitch-TN family, integrating a 725V power MOSFET and control circuitry for flyback topologies. It features internal frequency dithering to simplify EMI filter design and supports non-isolated LED driver applications. The device includes output short-circuit auto-restart and feedback open-circuit restart functions, reducing output power by over 90% during fault conditions. It compensates for transformer inductance tolerance, output cable voltage drop, and input voltage variations.

AC DC Converters, Offline Switchers Feature Summary

• Integrates a 725V power MOSFET with control logic for compact flyback designs.
• Supports non-isolated LED driver configurations to eliminate optocouplers and reduce component count.
• Includes internal frequency dithering to enhance electromagnetic interference performance.
• Provides automatic protection mechanisms for output short circuits and feedback open circuits.

AC DC Converters, Offline Switchers Applications

• Non-isolated LED lighting drivers
• Flyback AC/DC converters
• General-purpose offline power supplies

AC DC Converters, Offline Switchers Procurement Notes

Verify that the specific part number matches the required package type and temperature rating. Confirm that the ordering suffix corresponds to the intended tape-and-reel or tube packaging configuration as specified in the manufacturer's official documentation. Ensure compatibility with the target thermal management requirements for the application environment.

AC DC Converters, Offline Switchers Selection Notes

Select this component for designs requiring high integration and simplified EMI filtering through internal dithering. It is suitable for non-isolated LED applications where cost reduction via the removal of optocouplers is prioritized. Designers must account for its capability to compensate for transformer tolerances and line voltage variations when determining peripheral component values.

AC DC Converters, Offline Switchers Part Context

The LNK6428E belongs to the LinkSwitch-TN series by Power Integrations, designed for low-cost, high-reliability AC/DC conversion. It targets applications where board space is limited and component count needs minimization. The series is known for combining power switching and control functions into a single small package, facilitating efficient design for consumer and industrial electronics.

AC DC Converters, Offline Switchers Replacement Considerations

Consult official cross-reference lists for direct substitutes within the LinkSwitch-TN family. Verify pinout compatibility and electrical parameter alignment before substitution. Generic replacements may not support the same non-isolated LED driving capabilities or compensation features.

AC DC Converters, Offline Switchers FAQ

How does the LNK6428E handle output faults?

It features output short-circuit auto-restart and output feedback open-circuit restart functions. During these restart periods, the output power decreases by more than 90% to protect the system.

Can the LNK6428E be used in non-isolated circuits?

Yes, it can be designed into non-isolated circuits for LED power supplies, which allows for the omission of isolation components like optocouplers and reduces overall system cost.