High power factor LED driver-controller with mixed-mode dimming

22nd May 2019
Alex Lynn

The introduction of the AL1665 single-stage, fly-back and buck-boost controller for commercial, connected, and dimmable LED lighting installations operating at up to 100W, has been announced by Diodes Incorporated. The AL1665 is designed to drive an external MOSFET to control LED loads and maintain a high power factor.

It provides a compact and efficient solution that helps minimise the use of additional components and maintains high switching efficiency.

Designed to operate from an AC input voltage of between 85 and 305VAC, the AL1665 utilises primary side regulation (PSR) topologies, removing the need for optical isolation or secondary side control. With PSR, developers can design smaller solutions using less PCB area and achieve lower bill of material costs, while delivering constant current regulation to high-power LED lighting applications.

The ability to apply dimming across 0.5% to 100% of the high-power output makes the AL1665 suitable for commercial LED applications where the lighting output levels need to be adjustable to save power, or for aesthetic purposes like in retail displays.

Compatible with ANSI-approved dimmers, the output voltage can be adjusted between zero and ten volts using a dedicated PWM input, or with an analogue input voltage of between zero and 2.5V, making it simple to develop connected lighting systems that can be managed both locally and remotely.

The device employs boundary condition mode (BCM) conversion with valley switching to minimise losses and deliver high efficiency with low EMI. The wide supply voltage allows the AL1665 to operate in any geographical region directly from the main supply, while its line and load regulation of less than ±2%, power factor of more than 0.9, and THD of less than 20% enables manufacturers to comply with all relevant legislation.

The AL1665 is available in the SO-8 package priced at $0.20 in 1,000 piece quantities.

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