Power Integrations (News - Alert), maker of off-line LED driver ICs, has unveiled DER-323, a reference design for an 18W, 88 percent efficient, non-isolated A19 LED driver based on LNK460VG, a low-profile IC from the company’s LinkSwitch-PL family.
Officials with Power Integrations said the design is suitable for a 100 W incandescent bulb replacement and is optimized for low-line (90 VAC to 135 VAC) operation.
According to company officials, the circuit is low-cost, requiring only a simple single-sided board and 25 components. No potting is necessary and the transformer is replaced by a low-cost inductor.
Company officials said that 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.
“The lighting industry typically asks for 80 percent 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,” said Andrew Smith, product marketing manager at Power Integrations, in a statement.
Smith said that the 88 percent efficiency of DER-323 satisfies this need and makes the thermal design of the bulb straightforward and inexpensive.
He said that DER-323 is also compact, reliable and easy to manufacture thanks to its low component count, single-stage architecture and use of a low-cost inductor rather than a transformer.
Back in August, Power Integrations had announced two new additions to its LinkSwitch-PH IC family. The new devices allow commercial lighting applications up to 75 W to benefit from single-stage design, dramatically reducing BOM cost and enabling a smaller driver with very high efficiency. LNK410EG (dimming) and LNK420EG (non-dimming) provide a constant-current output with a PF- corrected and low THD input. The capabilities of the new devices are showcased in RDR-290, a reference design describing a single-output driver for high-bay lighting.
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Edited by Rachel Ramsey