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150W LED driver boasts 93% efficiency at 230VAC

08 Jun 2012

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Power Integrations has released a reference design kit for a 150W, 48V power supply for LED streetlights and other industrial/infrastructure lighting systems. The driver circuit described in RDR-292 claims to be more than 93 percent efficient at 230VAC input and more than 91 percent at 110VAC. The design delivers a system power factor of greater than 0.97, THD of less than 10 percent, and meets EN61000-3-2 C, added the company.

Designs can be scaled from 75-400W, using the same platform, simply by choosing different HiperPFS (PFC) and HiperLCS (LLC) family members, and sizing power components appropriately. RDK-292 requires fewer than 125 components to implement the driver's PFC, LLC and standby power supply circuits, resulting in low BOM cost and exceptional reliability, indicated Power Integrations.

The design uses a combination of Power Integrations' HiperPFS power-factor-correction IC and the HiperLCS resonant converter IC, which together saves up to 35 components compared with conventional LLC solutions, boasted the company. HiperLCS also permits the use of smaller magnetics and output filter capacitors than typical LLC designs. The design incorporates a Qspeed merged PIN-Schottky diode as well, 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 highly 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 about 800mW at 264VAC input, the company added.

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