LNK305DG

AC DC Converters, Offline Switchers Overview

The LNK305DG is a LinkSwitch-TN AC/DC converter IC designed for offline applications. It integrates a 700V power MOSFET and controller in an SO-8C package. The device supports buck, buck-boost, and flyback topologies with a switching frequency of 66 kHz. It delivers up to 175 mA in multi-discharge constant mode (MDCM) and 280 mA in continuous conduction mode (CCM). Operating input voltage ranges from 85 VAC to 265 VAC. The component functions within a temperature range of -40°C to +150°C TJ.

AC DC Converters, Offline Switchers Feature Summary

• Integrates high-voltage power MOSFET and control logic for minimal external component count
• Provides comprehensive protection against over-current, open-loop, over-temperature, and short-circuit conditions
• Supports multiple converter topologies including buck, buck-boost, and flyback configurations

AC DC Converters, Offline Switchers Applications

• Offline AC/DC power conversion systems
• Buck converter designs
• Flyback transformer-based power supplies

AC DC Converters, Offline Switchers Procurement Notes

Verify the specific suffix 'DG' indicates surface mount packaging distinct from through-hole variants. Confirm RoHS compliance status as older revisions may differ. Ensure the ordering code matches the required reel or cut tape quantity specifications for automated assembly processes.

AC DC Converters, Offline Switchers Selection Notes

Select this component for designs requiring integrated high-voltage switching without external gate drivers. Consider the 66 kHz switching frequency for EMI management. Evaluate thermal performance given the 150°C junction limit. Compare output current capabilities against load requirements in both MDCM and CCM modes.

AC DC Converters, Offline Switchers Part Context

This part belongs to the LinkSwitch-TN family, which consolidates primary side regulation and power switching into a single monolithic IC. The series targets cost-sensitive, low-power offline applications where board space and component count are critical constraints for mass production efficiency.

AC DC Converters, Offline Switchers Replacement Considerations

LNK305DG-TL serves as the direct equivalent with identical electrical characteristics and pinout compatibility.