LNK304DG

AC DC Converters, Offline Switchers Overview

The LNK304DG is an offline switcher IC from the LinkSwitch-TN family, designed to replace linear and capacitor-drop power supplies. It integrates a 700V power MOSFET, oscillator, open-loop control, high-voltage switched current source, frequency jittering, cycle-by-cycle current limit, and thermal shutdown. Operating at a switching frequency of 66 kHz with a maximum duty cycle of 72%, it supports input voltages from 85 VAC to 265 VAC. At 230 VAC input, it delivers 120 mA in discontinuous mode or 170 mA in continuous mode. The device operates within a junction temperature range of -40°C to +150°C.

AC DC Converters, Offline Switchers Feature Summary

• Integrates a 700V power MOSFET with open-loop control for minimal external component count
• Includes automatic restart circuitry to protect against output short circuits and open-loop faults
• Features frequency jittering to reduce electromagnetic interference emissions
• Provides cycle-by-cycle current limiting and thermal shutdown for robust operation

AC DC Converters, Offline Switchers Applications

• LED lighting drivers
• General-purpose non-isolated AC/DC power supplies
• Battery chargers for consumer electronics
• Standby power supplies for home appliances

AC DC Converters, Offline Switchers Procurement Notes

Verify the specific suffix 'DG' corresponds to the SO-8C surface-mount package configuration required for your design. Confirm that the active status aligns with long-term supply requirements, as availability may vary by region. Ensure compatibility with RoHS standards if mandated by your target market regulations. Cross-reference datasheet revisions to confirm pinout consistency with existing layouts.

AC DC Converters, Offline Switchers Selection Notes

Select this component for applications requiring low output currents below 360 mA where cost and board space are critical constraints. It is suitable for designs replacing linear regulators or capacitive dropper circuits. Consider the integrated protection features for simplified safety compliance. Evaluate the thermal performance within the enclosure, as the device relies on PCB heat dissipation for temperatures exceeding ambient limits.

AC DC Converters, Offline Switchers Part Context

The LNK304DG belongs to the LinkSwitch-TN series introduced by Power Integrations in January 2004. This series targets the replacement of inefficient linear and capacitive drop power supplies in low-power applications. The device is part of a broader portfolio including variants like LNK302 and LNK305, differentiated primarily by their output current capabilities while sharing the same core integration architecture.

AC DC Converters, Offline Switchers Replacement Considerations

Direct functional substitutes within the same family include LNK302DN-TL for lower current applications and LNK305GN-TL for higher current requirements. Verify that alternative packages such as DIP-8B or SMD-8 meet mechanical constraints if transitioning from through-hole designs.