LNK408LG

LED Driver IC Overview

The LNK408LG is an LED lighting driver IC from the LinkSwitch-PH series by Power Integrations. It integrates a 725 V power switch and control circuitry into a single-stage AC-DC offline switcher with flyback topology. The device supports triac dimming and operates within an input voltage range of 85 VAC to 308 VAC. Key electrical parameters include a switching frequency of 66 kHz, a maximum output current of 2.39 A, and a rated power of 35 W. It functions in temperatures from -40 °C to +150 °C and utilizes an eSIP-7F package.

LED Driver IC Feature Summary

• Integrates power factor correction and constant-current output in a single stage
• Supports leading-edge triac dimming for adjustable brightness control
• Combines high-voltage power switch with integrated controller
• Provides accurate constant-current regulation for LED loads

LED Driver IC Applications

• Triac-dimmable LED downlights
• LED bulb replacements
• General solid-state lighting fixtures

LED Driver IC Procurement Notes

Verify component status carefully as this part is classified as obsolete or last-time buy by the manufacturer. Confirm availability through authorized distributors or secondary markets. Ensure that any substitute components maintain compatibility with the required 725 V rating, 66 kHz frequency, and triac dimming functionality to preserve original design performance.

LED Driver IC Selection Notes

Select this component for designs requiring integrated PFC and CC regulation without external controllers. It is suitable for applications needing triac dimmability and operation across wide universal input voltages. Consider the eSIP-7F package constraints and thermal management requirements for the specified 35 W power level when finalizing the hardware layout.

LED Driver IC Part Context

This device belongs to the LinkSwitch-PH family, designed to simplify off-line LED driver implementations. It replaces discrete solutions by combining power factor correction and constant-current driving capabilities. The series targets cost-sensitive lighting applications while maintaining high efficiency and reliability standards typical of Power Integrations' offline switcher portfolio.

LED Driver IC Replacement Considerations

Available substitutes include parametric equivalents such as the LNK420LG. Verify that replacement parts match the original 725 V breakdown voltage, 66 kHz switching frequency, and triac dimming support. Ensure pinout compatibility and thermal characteristics align with the existing PCB footprint and cooling strategy.