LNK304DN-TL

AC DC Converters, Offline Switchers Overview

The LNK304DN-TL is a LinkSwitch-TN series offline converter from Power Integrations, designed for non-isolated power supplies. It integrates a 700V power MOSFET, oscillator, and control circuitry in an SO-8C package. Operating at a fixed frequency of 66 kHz with frequency jitter, it supports input voltages from 85 VAC to 265 VAC. The device delivers 120 mA output current in Mode Change Discontinuous Mode (MDCM) and 170 mA in Continuous Conduction Mode (CCM). It features automatic restart protection and thermal shutdown, functioning within a temperature range of -40°C to +150°C.

AC DC Converters, Offline Switchers Feature Summary

• Integrates a 700V power MOSFET with high-voltage startup circuitry and cycle-by-cycle current limiting into a single monolithic IC.
• Utilizes a skip-cycle ON/OFF control scheme to regulate output voltage while maintaining low standby power consumption.
• Incorporates frequency jittering to reduce electromagnetic interference (EMI) without requiring external filtering components.
• Includes fully integrated automatic restart and thermal shutdown circuits to protect against output short-circuits and over-temperature conditions.

AC DC Converters, Offline Switchers Applications

• Replacement for linear and capacitor dropper power supplies in household appliances
• Non-isolated LED driver applications
• Industrial control systems requiring low-cost AC/DC conversion

AC DC Converters, Offline Switchers Procurement Notes

Verify the suffix 'TL' indicates cut-tape packaging rather than reel configuration when sourcing. Confirm RoHS compliance status through official manufacturer documentation or authorized distributor datasheets. Ensure the specific SO-8C package variant matches the intended PCB footprint requirements before finalizing procurement orders.

AC DC Converters, Offline Switchers Selection Notes

Select this component for designs replacing linear regulators where output currents do not exceed 170 mA. The fixed 66 kHz switching frequency simplifies transformer design compared to variable frequency alternatives. Consider the SO-8C package dimensions for thermal management and board space constraints relative to through-hole DIP options.

AC DC Converters, Offline Switchers Part Context

This part belongs to the LinkSwitch-TN family, introduced by Power Integrations to provide cost-effective solutions for low-power offline applications. The LNK304DN-TL specifically offers surface-mount compatibility, distinguishing it from through-hole variants like the LNK304PN. It represents a shift towards highly integrated, system-level power management solutions.

AC DC Converters, Offline Switchers Replacement Considerations

Direct pin-compatible replacements include other LNK304 series variants such as LNK304GN-TL for different packaging needs. Verify that substitute parts maintain identical 700V breakdown voltage and 66 kHz operating frequency specifications to ensure circuit stability.