LNK419LG

LED Driver IC Overview

The LNK419LG is a LinkSwitch-PH family LED driver IC designed for off-line flyback applications. It integrates a high-voltage power switch and control circuitry to deliver constant current to LED strings. The device supports PWM dimming and operates within a supply voltage range of 36V to 725V. It features an internal 3.26A output capability and functions at a switching frequency of 66kHz. The component is housed in a 7-SSIP, 6-lead eSIP-7C package with a molded lead form, suitable for through-hole mounting across a junction temperature range of -40°C to 150°C.

LED Driver IC Feature Summary

• Integrates high-voltage power switch and control circuitry for simplified LED driver designs
• Supports PWM dimming functionality for light control applications
• Includes internal protection mechanisms such as over-temperature shutdown and cycle-by-cycle current limiting

LED Driver IC Applications

• General illumination lighting systems
• Off-line AC/DC LED drivers
• Constant current LED string regulation

LED Driver IC Procurement Notes

Verify the specific suffix 'EG' or 'LG' against the manufacturer's latest datasheet, as ordering codes may indicate packaging variations or regional compliance differences without altering electrical function. Confirm RoHS3 status and moisture sensitivity level requirements during storage and handling. Ensure the selected variant matches the required thermal and mechanical specifications for the target PCB layout.

LED Driver IC Selection Notes

Select this component for applications requiring integrated flyback conversion and LED driving in a single package. The LinkSwitch-PH series is suitable for designs prioritizing low component count and reduced bill of materials. Consider the 725V maximum supply rating and 3.26A current limit when sizing the transformer and output stage. Evaluate the eSIP-7C package constraints for thermal management and creepage distances in high-voltage environments.

LED Driver IC Part Context

The LNK419LG belongs to the LinkSwitch-PH family from Power Integrations, which combines a high-voltage MOSFET with intelligent control logic. This family targets cost-sensitive, high-volume LED lighting applications by eliminating the need for secondary-side controllers and optocouplers. The design philosophy emphasizes simplicity, reliability, and compliance with energy efficiency standards for solid-state lighting products.

LED Driver IC Replacement Considerations

No direct pin-to-pin replacement is confirmed for the LNK419LG in public documentation. Designers should evaluate other LinkSwitch-PH variants (e.g., LNK413, LNK416) if current or voltage requirements differ, though these may require schematic adjustments. Cross-referencing with the TOPswitch-JX family is possible but not guaranteed to be compatible without redesign.