LYT1403D

LED Driver IC Overview

The LYT1403D is a highly integrated LED driver IC from the LYTSwitch-1 family by Power Integrations. It combines a high-voltage switched-current source, oscillator, high-voltage switch, and frequency jittering into a single package. The device operates in a buck topology with an input voltage range of 90 V to 308 V. It provides a regulated output current of 139 mA and functions at a switching frequency of 20 kHz. The component supports operation within a temperature range of -40°C to +125°C and is available in an SOIC-8 package.

LED Driver IC Feature Summary

• Integrates primary-side regulation to eliminate optoisolators and reduce component count
• Incorporates frequency jittering for improved EMI performance
• Features built-in thermal shutdown protection for enhanced reliability

LED Driver IC Applications

• LED lighting drivers
• General-purpose isolated power supplies

LED Driver IC Procurement Notes

Verify availability status as the LYT1403D may be discontinued or subject to supply constraints. Confirm the specific ordering suffix (e.g., TL for reel) against current manufacturer documentation. Ensure compliance with RoHS directives and check for any alternative recommended parts if the original component is no longer actively supported for new designs.

LED Driver IC Selection Notes

Select this component for applications requiring a compact, low-component-count solution for AC-DC LED driving. The LYTSwitch-1 family is suitable for designs prioritizing cost reduction through primary-side control. Consider the 139 mA output limit and 308 V maximum input voltage when defining circuit requirements. The SOIC-8 package offers a balance between thermal performance and board space efficiency.

LED Driver IC Part Context

The LYT1403D belongs to the LYTSwitch-1 series, designed to simplify LED driver design. This family integrates the controller and power switch to minimize external components. It targets general illumination and adapter applications where size and bill-of-materials cost are critical factors. The technology focuses on reducing assembly complexity while maintaining reliable performance across varying line conditions.

LED Driver IC Replacement Considerations

Check manufacturer datasheets for direct pin-compatible upgrades within the LYTSwitch family. Verify that any substitute maintains the required 139 mA output capability and input voltage range. Ensure thermal characteristics and package dimensions match the existing PCB layout constraints.