LNK304DN

AC DC Converters, Offline Switchers Overview

The LNK304DN-TL is a LinkSwitch-TN series offline switcher IC designed for non-isolated power supplies. It integrates a 700V power MOSFET, oscillator, open-loop control, and protection circuits. Operating at a fixed 66 kHz switching frequency with frequency jitter to reduce EMI, it supports Buck, Buck-Boost, and Flyback topologies. The device accepts an AC input voltage range of 85 VAC to 265 VAC. In discontinuous mode (MDCM), it delivers a maximum output current of 120 mA, while continuous mode (CCM) provides up to 170 mA. The component operates within a junction temperature range of -40°C to +150°C and utilizes an SO-8C surface-mount package.

AC DC Converters, Offline Switchers Feature Summary

• Integrates a 700V power MOSFET with high-voltage startup circuitry and simple open-loop control logic.

AC DC Converters, Offline Switchers Applications

• Non-isolated AC/DC converters
• LED drivers
• Industrial control systems

AC DC Converters, Offline Switchers Procurement Notes

Verify the specific suffix against official datasheets, as variations such as TL indicate tape-and-reel packaging. Confirm that the SO-8C package matches the required footprint. Ensure compliance with RoHS standards and lead-free requirements for the target manufacturing process. Cross-reference the part number with manufacturer documentation to validate availability status.

AC DC Converters, Offline Switchers Selection Notes

Select this component for applications requiring low component count and cost-effective non-isolated power solutions. It serves as a direct replacement for linear regulators and capacitive dropper circuits in low-current designs. Consider the integrated thermal shutdown and auto-restart features for robust fault protection without external sensing components.

AC DC Converters, Offline Switchers Part Context

This device belongs to the LinkSwitch-TN family from Power Integrations, introduced in January 2004. The series targets the replacement of inefficient linear and capacitive dropper power supplies in appliances and industrial controls. The LNK304 variant specifically addresses output currents below 360 mA, offering higher efficiency and system reliability compared to legacy technologies.

AC DC Converters, Offline Switchers Replacement Considerations

Direct substitutes include LNK304GN-TL and LNK304DG-TL for surface-mount configurations, and LNK304PN for through-hole DIP-8 installations. Verify pin compatibility and thermal performance when transitioning between package types.