LNK304G

AC DC Converters, Offline Switchers Overview

The LNK304G is an offline switcher IC from the LinkSwitch-TN family, designed to replace linear regulators and capacitor-drop power supplies for output currents up to 360 mA. It integrates a 700 V power MOSFET, oscillator, on/off control scheme, high-voltage current source, frequency jittering, cycle-by-cycle current limit, and thermal shutdown. Operating at a nominal switching frequency of 66 kHz with approximately 4 kHz peak-to-peak jitter, it supports wide input voltages from 85 VAC to 265 VAC. The device delivers 120 mA in MDCM or 170 mA in CCM at 230 VAC input.

AC DC Converters, Offline Switchers Feature Summary

• Integrates a 700 V power MOSFET with simple on/off control and high-voltage startup circuitry
• Features automatic restart protection that limits output power during short-circuit or open-loop faults
• Incorporates frequency jittering to reduce electromagnetic interference emissions
• Includes built-in hysteresis thermal shutdown for safe operation under overload conditions

AC DC Converters, Offline Switchers Applications

• LED lighting drivers
• Household appliances
• Industrial control systems

AC DC Converters, Offline Switchers Procurement Notes

Verify the specific suffix (e.g., DG, GN, PN) against the required package type, as the base model number does not define the physical footprint. Confirm RoHS compliance status and moisture sensitivity level requirements prior to ordering. Ensure the selected variant matches the intended PCB layout constraints for either surface mount or through-hole implementation.

AC DC Converters, Offline Switchers Selection Notes

Select this component when designing non-isolated AC/DC converters requiring minimal external components. It is suitable for applications where system cost must match traditional linear solutions but higher efficiency is needed. Consider the maximum output current capability relative to the load requirements and ensure adequate thermal management for the chosen operating temperature range.

AC DC Converters, Offline Switchers Part Context

The LNK304G belongs to the LinkSwitch-TN series introduced by Power Integrations in January 2004. This family targets low-power offline conversion tasks, specifically aiming to supersede less efficient linear and capacitive dropper designs. The technology emphasizes high integration to minimize bill of materials and board space while maintaining robust protection features.

AC DC Converters, Offline Switchers Replacement Considerations

Direct replacements include other variants within the LinkSwitch-TN family such as LNK304DG, LNK304GN, and LNK304PN, depending on the necessary package configuration.