Mains-dimmable LED lamp driver from Diodes Inc. raises device flexibility

PLANO, USA: Diodes Inc. has introduced the AP1694, an AC-DC controller providing a universal high-performance driver solution for a variety of mains-dimmable LED lamp designs. Suitable for both 120V and 230V AC inputs, while supporting non-isolated buck, buck-boost and isolated flyback topologies, this part enables between 10 percent and 50 percent reductions in total BOM costs.

The controller uses Diodes' patented PFM technology to tightly regulate LED current and achieve a high power factor and low total harmonic distortion. By operating in boundary-conduction mode, the AP1684 also assures high efficiency and low EMI driver characteristics. As a primary side controller, this part removes the need for opto-coupler and secondary-side control circuitry, and being inherently stable, eliminates the need for loop compensation.

The AP1694 delivers a 5 percent initial LED current accuracy, meeting the requirements of most mains-dimmable LED lighting applications and is compatible with a wide range of different dimmers, including both leading edge and trailing edge types. It achieves deep dimming down to 1%, complies with the NEMA SSL6 standard for dimming curves and meets the requirements of the IEC6100-3-2 harmonic standard.

Provided in the small form factor SO-8 package and requiring only 26 external components in buck topology, the AP1694 driver controller offers designers of mains-dimmable LED lamps a higher power density with a simpler and smaller total circuit footprint. The device also integrates comprehensive protection features, including open-load detection, over-voltage, short-circuit and over-temperature protection.