New driver design maximises efficiency of Cree HV LEDs

Power Integrations has published a reference design describing a high-efficiency, ultra-compact driver for a B10-style LED light bulb. Based on Power Integrations’ LinkSwitch-PL non-isolated, single-stage LED driver IC, the DER-297 power supply design is specifically tailored for use with high-voltage LEDs such as the recently announced XLamp XM-L and XLamp XT-E ranges from Cree. The design provides the high-voltage output required by the LEDs, optimising overall system efficiency by reducing power lost due to current flow in the driver inductor and output diode. The DER-297 power supply design has a BOM of only 20 components, aided by the high level of integration in the LinkSwitch-PL device, which combines PFC and constant-current functions into a single buck-boost stage requiring only a tiny inductor.
The design reaches 87% efficiency at 115 VAC for a 4.3 W LED driver (86% for 2.9 W output) while achieving a power factor greater than 0.9, easily meeting EN61000-3-2 Class C limits, and creating less than 20% Total Harmonic Distortion (THD).
Commented Andrew Smith, product marketing manager for LED applications at Power Integrations: “The tiny B10 and similarly compact form factors are very challenging for LED lamps. The LinkSwitch-PL device used in DER-297 permits the driver to be both small and highly efficient, which allows us to pack the design into a B10 base without using potting compound or compromising performance. The simple BOM also means that the converter has a very low cost, making DER-297 ideal for this increasingly price-competitive market.”
Mark McClear, applications engineering director at Cree, added: “The very low-volume enclosure of the B10 bulb creates a substantial engineering challenge for the driver designer. Power Integrations’ LinkSwitch-PL device configured in the buck-boost topology not only drives the LEDs beautifully, but easily meets the physical and thermal specifications due to the low component count and high operational efficiency.”

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