LYT5218D

AC DC Converters, Offline Switchers Overview

The LYT5218D is an offline switcher from the LYTSwitch-5 family, designed for flyback, buck, and boost topologies. It integrates a 650V high-voltage MOSFET and operates at a switching frequency of 132.7kHz. The device supports input voltages from 115 VAC to 230 VAC and delivers up to 25W of output power. It features constant current regulation with adjustable output voltage. The component is housed in a 16-SO B (SO-16B-14) surface-mount package and functions within a junction temperature range of -40°C to 150°C.

AC DC Converters, Offline Switchers Feature Summary

• Integrates a 650V high-voltage power MOSFET with primary-side control to eliminate optocouplers.
• Supports multiple converter topologies including flyback, buck, and boost configurations.
• Provides constant current regulation suitable for LED lighting driver applications.

AC DC Converters, Offline Switchers Applications

• Non-dimmable LED lighting drivers
• General-purpose isolated power supplies
• Offline AC/DC conversion systems

AC DC Converters, Offline Switchers Procurement Notes

Verify part authenticity through authorized distributors as the component status may be discontinued or subject to supply restrictions. Confirm the specific suffix 'D' matches the required SO-16B-14 package variant. Check RoHS compliance and moisture sensitivity level (MSL 3) requirements for your assembly process. Ensure design compatibility with the 132.7kHz switching frequency before procurement.

AC DC Converters, Offline Switchers Selection Notes

Select this IC for designs requiring integrated high-voltage switching without external gate drive components. The LYTSwitch-5 family allows for simplified bill of materials by removing optoisolators. Consider the 25W power limit and 650V breakdown voltage when sizing magnetics. The wide operating temperature range supports robust industrial or consumer electronics environments.

AC DC Converters, Offline Switchers Part Context

The LYT5218D belongs to the LYTSwitch-5 series, which combines controller, oscillator, and high-voltage MOSFET into a single monolithic IC. This integration reduces solution cost and board space compared to discrete solutions. The family targets low-to-medium power offline applications where high efficiency and reliability are prioritized over complex digital control features.

AC DC Converters, Offline Switchers Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation. Verify pinout and thermal characteristics if considering alternative families such as LYTSwitch-4 or LYTSwitch-6.