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Diodes Incorporated


Diodes has announced the introduction of the AL1665 AC-DC power controller for commercial, connected and dimmable LED lighting installations consuming up to 100W.

The AL1665 can implement single-stage flyback and buck-boost topologies. It drives an external MOSFET to control LED loads and maintain a high power factor. It provides a compact and efficient solution which helps to minimize the use of additional components and maintains high switching efficiency.

Operating from an input voltage of between 85V and 305V AC, the AL1665 uses Primary-Side Regulation (PSR) topologies which eliminate the need for optical isolation or secondary-side control. The benefit of PSR topologies is that developers can design smaller solutions which occupy a smaller PCB area and have a lower bill-of-materials cost, while providing constant-current regulation to high-power LED lighting applications.

The ability to apply dimming down to 0.5% of full brightness makes the AL1665 suitable for commercial LED applications in which the light output needs to be adjustable to save power, or for aesthetic purposes, as in retail displays.

Compatible with ANSI-approved dimmers, the output voltage can be adjusted between 0V and 10V using a dedicated PWM input, or with an analogue input voltage of between 0V and 2.5V, making it simple to develop connected lighting systems that can be managed locally or remotely.

The device employs boundary condition-mode conversion with valley switching to minimise losses and raise efficiency while generating low levels of EMI.

  • <±2% line and load regulation accuracy
  • >0.9 power factor
  • <20% total harmonic distortion
  • Multiple circuit protection functions
  • Commercial dimmable LED lighting
  • LED backlight drivers
  • General-purpose constant-current source

The AL1665 supports analog and digital dimming methods


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