LYT1603D

LED Driver IC Overview

The LYT1603D is a single-stage LED driver IC from the LYTSwitch-1 family, designed for buck topology applications. It integrates a high-voltage switch and controller to simplify design. The device supports an input voltage range of 90 V to 308 V and delivers a maximum output current of 139 mA. Operating at a switching frequency of 20 kHz, it ensures stable performance across temperatures from -40 °C to +125 °C. Packaged in an SOIC-8, this component serves as a compact solution for low-power LED lighting systems requiring efficient power conversion.

LED Driver IC Feature Summary

• Integrates primary-side control with a high-voltage MOSFET for simplified circuit design
• Supports buck topology for direct AC-to-LED power conversion without optocouplers
• Provides constant current regulation suitable for LED string driving

LED Driver IC Applications

• Low-power LED lighting fixtures
• General illumination drivers
• Single-stage AC-DC LED converters

LED Driver IC Procurement Notes

Verify availability status carefully as the LYT1603D is listed as obsolete or discontinued by major distributors such as Mouser. Check for the tape-and-reel variant (LYT1603D-TL) if reel packaging is required. Confirm that the specific suffix matches your manufacturing needs, as package formats may have changed. Ensure compatibility with existing designs before sourcing due to end-of-life status.

LED Driver IC Selection Notes

Select the LYT1603D for applications requiring a simple, cost-effective buck converter architecture for LED strings. It is suitable for universal input voltages up to 308 V. Consider the 20 kHz operating frequency when designing magnetic components. Verify that the 139 mA output current meets the load requirements. The SOIC-8 package offers a compact footprint for space-constrained designs.

LED Driver IC Part Context

The LYT1603D belongs to the LYTSwitch-1 series, which focuses on integrating power switching and control functions into a single package. This family targets low-complexity LED drivers where minimizing external components is critical. Unlike later generations like LYTSwitch-6, this series utilizes basic primary-side regulation without advanced feedback technologies like FluxLink.

LED Driver IC Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation. As the LYT1603D is marked as obsolete, engineers should consult Power Integrations for recommended upgrades within newer families such as LYTSwitch-4 or LYTSwitch-6, depending on efficiency and dimming requirements.