LYT7503D

LED Driver IC Overview

The LYT7503D-TL is an LED lighting driver IC from the LYTSwitch-7 series, designed for single-stage PFC applications. It integrates a high-voltage switch and controller in an SOIC-8 package. The device supports an input voltage range of 90 VAC to 300 VAC (or 308 VAC per some listings) and operates at a switching frequency of 20 kHz. It provides a constant current output of 125 mA with a maximum power dissipation of 18 W. The component functions within a temperature range of -40°C to +150°C TJ and includes Triac dimming capability.

LED Driver IC Feature Summary

• Integrates primary-side regulation and high-voltage switching for simplified design
• Supports single-stage Power Factor Correction (PFC) topology
• Includes Triac dimming functionality for compatibility with standard wall dimmers

LED Driver IC Applications

• LED lighting drivers requiring single-stage PFC
• Isolated and non-isolated LED converter topologies
• General illumination fixtures with dimming requirements

LED Driver IC Procurement Notes

Verify the specific ordering suffix, as the base model LYT7503D may correspond to tube packaging while LYT7503D-TL indicates reel or cut tape options. Confirm RoHS compliance status and moisture sensitivity level prior to procurement. Check for obsolescence notices, as this part is listed as not recommended for new designs in some sources. Ensure the selected variant matches the required packaging format for your assembly process.

LED Driver IC Selection Notes

Select this component for designs requiring integrated PFC and constant current control in a compact SOIC-8 footprint. Verify that the required output current does not exceed 125 mA and that the input voltage aligns with the 90-300 VAC range. Consider the thermal performance given the 18 W power dissipation limit. Ensure the application requires Triac dimming support if that feature is necessary for the end product.

LED Driver IC Part Context

The LYT7503D belongs to the LYTSwitch-7 family, which combines primary and secondary controllers with a high-voltage switch. This integration reduces component count significantly compared to discrete solutions. The series is optimized for LED drivers, offering high efficiency and reliability in both isolated and non-isolated configurations.

LED Driver IC Replacement Considerations

Check for direct substitutes within the LYTSwitch family, such as the LYT7504D, which may offer similar specifications. Verify pinout compatibility and electrical parameters before substitution. Consult official datasheets for any functional differences between variants.