ISL1903FAZ-T

Overview

The ISL1903FAZ-T is a dimmable buck LED driver IC designed for high-power LEDs. It integrates an AC-DC offline switcher with triac dimming capability, eliminating the need for external components typically required in traditional designs. The device operates from a universal AC input and provides a regulated DC output to drive LED strings. Packaged in a 16-QSOP (16-SSOP) case, it supports supply voltages up to 20V. This integrated solution simplifies ballast design by combining power factor correction and constant current regulation into a single chip.

Feature Summary

• Integrates AC-DC offline switching and buck regulation for simplified LED ballast design
• Supports leading-edge triac dimming for compatibility with standard household dimmers
• Designed specifically for driving high-power LED loads with constant current regulation

Applications

• Dimmable general lighting fixtures
• High-power LED downlights
• LED retrofit bulbs requiring triac dimming support

Procurement Notes

Verify component authenticity through authorized Renesas distributors or certified partners. Confirm package integrity upon receipt, as the unit is obsolete and may be sourced from surplus channels. Ensure storage conditions meet manufacturer specifications to prevent degradation of the 16-QSOP package before assembly.

Selection Notes

Select this component for applications requiring integrated AC-DC conversion and triac dimming without external control loops. Verify that the target LED load voltage falls within the buck converter's operational range relative to the AC input. Consider the obsolete status when planning long-term production lifecycles.

Part Context

This part belongs to the ISL1903 series of LED drivers from Renesas Electronics. It represents a specialized class of integrated power management solutions aimed at reducing bill-of-materials count in lighting applications. The series focuses on combining power stage and control logic to streamline manufacturing processes for consumer and commercial lighting products.

Replacement Considerations

The product status is listed as Obsolete. No public confirmed substitute part numbers are available in the provided documentation. Designers must evaluate alternative discontinued parts or new generation equivalents based on pin compatibility and electrical specifications.