LED driver reference design targets 100W incandescent bulb replacements
DER-323 utilizes a simple buck-boost converter topology that fits easily inside the A19 bulb. The design is EN61000-3-2 (C) compliant and has a high power factor of over 0.98, easily satisfying commercial and consumer compliance requirements. Because LinkSwitch-PL ICs combine both PFC and CC converter functions in a single-stage topology, no electrolytic bulk capacitor is required, resulting in a very long operational life.
According to product marketing manager Andrew Smith, the lighting industry typically asks for 80% efficiency for drivers targeting 60 W A19 bulb replacements. To achieve viable LED-based replacements for 75 W and 100 W bulbs, much higher efficiency is needed in order to reduce the heat dissipated by the driver. The 88% efficiency of DER-323 satisfies this need and makes the thermal design of the bulb straightforward and inexpensive. Features such aslow component count, single-stage architecture and use of a low-cost inductor rather than a transformer help to keep the price level for the product low.
DER-323 is available for download at:
https://www.powerint.com/sites/default/files/PDFFiles/der323.pdf
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