Diodes introduces the AL1665 single-stage flyback and step-down boost controller

     Diodes, Inc. today announced the AL1665 single-stage flyback and step-down boost controller for commercial, online, dimmable LED lighting installations operating up to 100W. Designed to drive external MOSFETs to control LED loads and maintain high power factors, the AL1665 also offers a small, high-efficiency solution to help minimize additional components and maintain high switching efficiency. The AL1665 is available in the SO-8 package

     The AL1665 is designed for AC input voltages between 85VAC and 305VAC, using a primary side regulation (PSR) topology without optical isolation or secondary side controllers. Developers can use PSR to design smaller solutions with less PCB area, lower material costs, and constant current regulation for the highest power LED lighting product applications.

     The AL1665 can be dimmed between 0.5% and 100% of high power output and is suitable for commercial LED product applications where the lighting output level can be adjusted for aesthetics or power savings, such as retail displays. The output voltage is compatible with ANSI-approved dimmers and can be adjusted between 0V and 10V using a dedicated PWM output, or between 0V and 2.5V using an analog input voltage, simplifying the development of local and remotely managed online lighting systems.

     The device uses boundary condition mode (BCM) conversion and valley switching to significantly reduce losses and provide high efficiency at low EMI. The wide supply voltage allows the AL1665 to operate directly from the main supply in any area with line and load regulation of less than ±2%, a power factor greater than 0.9, and a THD of less than 20%, enabling manufacturers to comply with all relevant regulations.