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LED driver design offers 93%efficiency at 30% less BOM

Posted: 08 Jun 2012 ?? ?Print Version ?Bookmark and Share

Keywords:reference design kit? power supply? LED driver?

Power Integrations has released new reference design kits for LED streetlights and other industrial/infrastructure lighting systems.

The RDR-292 reference design kit for a 150W, 48V power supply features a driver circuit that is said to be more than 93 percent efficient at 230Vac input and above 91 percent at 110Vac. The design, which meets EN61000-3-2C, claims a system power factor greater than 0.97, THD less than 10 percent. Designs can be scaled from 75W to 400W, using the same platform by choosing different HiperPFS (PFC) and HiperLCS (LLC) family members and sizing power components appropriately.

The RDK-292 needs less than 125 components to implement the driver's PFC, LLC and standby power supply circuits. It uses a combination of the company's HiperPFS power-factor-correction IC and the HiperLCS resonant converter IC, which together save up to 35 components compared with conventional LLC solutions. HiperLCS also allows for the use of smaller magnetics and output filter capacitors than typical LLC designs.

The design also incorporates a Qspeed merged PIN-Schottky diode, boosting CCM PFC efficiency by delivering greatly reduced diode recovery losses when compared with conventional ultrafast silicon PFC diodes.

For installations with remote lighting-control systems, the design implements efficient standby power-supply functionality based on Power Integrations' LinkSwitch-TN ICs. The addition of a CAPZero X-capacitor discharge IC delivers further power savings, reducing no-load consumption to around 800mW at 264Vac input.

The RDK-292 reference design kit contains specification, schematic, BOM, transformer documentation, PCB layout, and performance data. RDK-292 and RDR-292 are available now.

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