LED driver reference design maximizes efficiency of high-voltage LEDs
Power Integrations has a 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 power supply is specifically tailored for use with high-voltage LEDs such as the recently announced XLamp XM-L and XLamp XT-E ranges from Cree.
Targeting compact B10, GU10, E17 and A19 bulbs, the DER-297 reference design provides the high-voltage output required by the LEDs, optimizing overall system efficiency by reducing power lost due to current flow in the driver inductor and output diode.
The design is very small and cost-effective with a BOM of only 20 components. The high level of integration in the LinkSwitch-PL device 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).
In general, the tiny B10 and similarly compact form factors are very challenging for LED lamps. The LinkSwitch-PL device used in the reference design permits the driver to be both small and highly efficient, which allows users 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.
The DER-297 is reference design available at https://www.powerint.com/sites/default/files/PDFFiles/der297.pdf
If you enjoyed this article, you will like the following ones: don't miss them by subscribing to :
