Power Integrations Introduces Reference Design for 5W LED Lamps with Power Factor Correction and Flicker Free Thyristor Dimming

SAN JOSE, Calif.--(BUSINESS WIRE)--Power Integrations, Inc. (Nasdaq: POWI), a leader in high-voltage integrated circuits for energy-efficient power conversion, today unveiled a new 5 W offline LED Driver Reference Design (RDK-251) with flicker-free TRIAC dimming and single-stage power factor correction (PFC). The reference design is based on Power Integrations' innovative LinkSwitch-PL family of LED driver ICs, the LNK457DG, for a compact, non-isolated power supply.

The new reference design provides a single 350 mA constant current output at 15 V rated LED string voltage. Using a standard AC mains thyristor dimmer reduces the output current to 1% (3 mA), which does not cause the LED array to be unstable or flicker. The power supply is compatible with both low-cost leading edge dimmers and more complex trailing edge dimmers. It operates over a universal AC input range (85 VAC to 265 VAC, 47 Hz to 63 Hz) with AC withstand voltages from 0 VAC to 300 VAC, enhancing field application reliability and extending line voltage dips And the service life under sudden rise conditions.

The new reference design has a higher power factor (>0.9) and lower input current total harmonic distortion (THD) (<10% at 115 VAC and <15% at 230 VAC), making it easy to meet international energy efficiency standards. Requirements and make individual designs available worldwide. In addition to the LinkSwitch-PL device, the new reference design uses only 38 passive components and discrete components (29 components for non-dimming applications), making it ideal for compact power supplies. Since the passive components required in the design of the old LED driver are omitted, the manufacturability and service life are also improved, and the components that are omitted include large-capacity capacitors and low-reliability high-voltage electrolytic capacitors. Like its corresponding isolated IC family, the LinkSwitch-PH, the LinkSwitch-PL integrates the controller and high-voltage power MOSFETs onto a single silicon chip, further reducing component count and eliminating parasitic components between the controller and the high-voltage power MOSFET. Can greatly simplify the layout of the PCB.

The board can be housed in a pear-shaped A19 LED replacement lamp with an E26/27 lamp holder. The RDK-251 provides complete power specifications, schematics, bill of materials, transformer documentation, printed circuit board layout, and performance data.

Bill Weiss, lighting business development manager at Power Integrations, said: "This design enables high-quality dimming of SSL lamps, high power factor, low THD, compact form factor and high reliability. In addition, it can meet or exceed all energy efficiency. Regulatory requirements. Solid-state lighting manufacturers can build a platform that can operate at both low voltage and high voltage. For system designers, this compact, lightweight, high-performance design speeds time to market."