LYT4311E

AC DC Converters, Offline Switchers Overview

The LYT4311E is an offline switch from the LYTSwitch-4 family, integrating a high-voltage power switch and controller in a single package. It supports Flyback, Buck, and Boost topologies with a switching frequency of 140kHz. The device features a 725V breakdown voltage and delivers up to 12W of output power. It operates within a junction temperature range of -40°C to 150°C and utilizes an eSIP-7C (7-SSIP) package with six leads and a exposed pad for through-hole mounting.

AC DC Converters, Offline Switchers Feature Summary

• Integrates primary-side constant current regulation and power factor correction into a single-stage design
• Eliminates the need for optoisolators and bulk aluminum electrolytic capacitors on the secondary side
• Supports TRIAC dimming and non-dimming options for LED lighting applications

AC DC Converters, Offline Switchers Applications

• High-power LED drivers for low-line AC input applications
• General-purpose offline power supplies requiring isolation
• LED bulbs and fixtures demanding extended lifetime and high efficiency

AC DC Converters, Offline Switchers Procurement Notes

Verify component authenticity as the LYT4311E is officially listed as End-of-Life by Power Integrations. Confirm that any available stock represents genuine manufacturer inventory rather than obsolete surplus. Check for valid traceability documentation and ensure the part matches the specific eSIP-7C package variant required for your design integration.

AC DC Converters, Offline Switchers Selection Notes

Select this component for designs requiring integrated PFC and tight constant current regulation without secondary-side feedback components. Consider the 140kHz switching frequency for magnetic size optimization. Evaluate the 12W power limit against load requirements. Note that the device is discontinued; assess long-term supply chain risks and potential redesign needs for future production runs.

AC DC Converters, Offline Switchers Part Context

The LYT4311E belongs to the LYTSwitch-4 family, which combines driver, controller, and switch functions. This family targets high-performance, cost-effective LED drivers that meet international harmonic standards. The integration reduces component count and allows for single-sided PCB layouts, simplifying manufacturing processes compared to traditional multi-component offline solutions.

AC DC Converters, Offline Switchers Replacement Considerations

Power Integrations suggests the LYTSwitch-6 family as a suggested alternative for new designs due to the discontinuation of the LYTSwitch-4 series.