LYT4327E

AC DC Converters, Offline Switchers Overview

The LYT4327E is an offline switcher from the LYTSwitch-4 family, designed for LED lighting applications. It integrates a high-voltage MOSFET and control circuitry into a single eSIP-7C package. The device supports flyback, buck, and boost topologies with a switching frequency of 140kHz. It offers 18W power capability in standard configurations and up to 50W for specific LED driver implementations. The component features a 725V breakdown voltage and operates within a junction temperature range of -40°C to 150°C. It provides constant current regulation with tight tolerance.

AC DC Converters, Offline Switchers Feature Summary

• Integrates TRIAC dimming compatibility for non-dimming and dimmable AC line applications
• Includes internal power factor correction technology suitable for low input voltage scenarios
• Provides constant current adjustment rate better than +/-5% for stable LED output

AC DC Converters, Offline Switchers Applications

• TRIAC dimmable LED lighting drivers
• Offline flyback converters
• Step-down (buck) power supplies
• Step-up (boost) power supplies

AC DC Converters, Offline Switchers Procurement Notes

Verify component status as the LYT4327E is listed as obsolete or discontinued by the manufacturer. Confirm availability through secondary distributors if new production units are required. Ensure replacement strategies account for the end-of-life status. Check for updated assembly site notifications or product change notices that may affect sourcing. Validate RoHS compliance and moisture sensitivity levels before integration.

AC DC Converters, Offline Switchers Selection Notes

Select this component for designs requiring integrated TRIAC dimming support without external feedback loops. Consider the eSIP-7C package for compact form factors. Evaluate the 140kHz switching frequency for EMI management. Assess the 725V MOSFET rating against peak voltage stresses. Review thermal performance requirements given the 150°C junction limit. Compare power density needs against the 18W to 50W capability range.

AC DC Converters, Offline Switchers Part Context

The LYT4327E belongs to the LYTSwitch-4 series, which combines primary-side regulation with system-level protection. This family targets low-component-count power supplies for LED lighting. The eSIP-7C package integrates the switch, controller, and protection circuits. It eliminates the need for optocouplers and secondary-side components. The series emphasizes high efficiency and simplified design processes.

AC DC Converters, Offline Switchers Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation. The component is marked as obsolete. Designers should consult the manufacturer's official obsolescence notices for recommended alternatives. Cross-reference specifications with newer generations such as LYTSwitch-5 or LYTSwitch-6 families for functional equivalents.