AL1788W6-7

Specialized ICS Overview

The AL1788W6-7 is a Power Factor Correction (PFC) and Primary Side Regulation (PSR) controller manufactured by Diodes Incorporated. It targets LED lighting applications, eliminating the need for opto-couplers to reduce BOM cost. The device operates in Quasi-Resonant (QR) mode with constant on-time control, achieving PF >0.9 and THD <20% across wide loading ranges. Key electrical parameters include a VCC operating range of 9.0V to 25V, startup threshold of 19V, minimum operating voltage of 7.0V, and maximum switching frequency of 120kHz. It integrates protections including UVLO, OVP, OCP, OSP, and OTP.

Specialized ICS Feature Summary

• Primary Side Regulation (PSR) eliminates opto-coupler requirements
• Quasi-Resonant (QR) valley switching minimizes switching loss
• Integrated protections: UVLO, OVP, OCP, OSP, and Thermal Shutdown
• Supports Flyback and Buck topologies

Specialized ICS Applications

• General LED Lighting
• Smart Connected LED Light Bulbs
• LED Tubes, Panel Lights, Troffers, and Ceiling Lights

Specialized ICS Procurement Notes

Verify the SOT-26 package marking code A8 against the datasheet DS39401 Rev. 1-2. Confirm RoHS compliance and Halogen/Antimony-free status as defined by Diodes Incorporated standards. Ensure the ordering suffix -7 corresponds to the 3,000-unit Tape & Reel packaging format.

Specialized ICS Selection Notes

Select based on input voltage range (9V–25V at VCC) and required switching frequency (max 120kHz). Verify thermal resistance limits (θJA 160°C/W) for the SOT-26 package under expected power dissipation conditions. Ensure external MOSFET breakdown voltage accommodates the reflected voltage calculated from the transformer turns ratio.

Specialized ICS Part Context

The AL1788W6-7 belongs to the AL1788 series of AC/DC PFC controllers. It is designed for high-efficiency LED drivers using either Flyback or Buck topologies. The W6 suffix indicates the SOT-26 (SC74R) surface-mount package, while the -7 suffix denotes the standard 3,000-unit tape and reel quantity.

Specialized ICS Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation.