Products, Materials + Tools | Nov 18, 2011

Power Integrations’ LinkSwitch™-PH LED Driver ICs Now Available in Low-Profile Package

Power Integrations, the world leader in high-efficiency, high-reliability LED driver ICs, today announced the availability of LinkSwitch-PH LED driver ICs in a low-profile eSIP™-L package that measures just 2 mm high. The new package targets LED-based replacements for fluorescent tubes, where very low-profile packages are required to fit into the small space available behind the LED circuit board, as well as other applications where board height is constrained.

LinkSwitch-PH devices in the 2-mm eSIP-L package have the same thermal and electrical performance as previously released ICs in the 10 mm high eSIP-E package. The new eSIP-L package features a heat transfer tab on top of the device which is electrically quiet (source potential) so any additional heatsink does not contribute to electrical noise propagation.

Power Integrations’ LinkSwitch-PH single-stage, primary-side controlled, LED driver ICs feature >90% efficiency and >0.9 power factor. The innovative topology eliminates the need for unreliable electrolytic capacitors and opto-isolators, making the devices especially well-suited for high-reliability industrial, commercial, and exterior solid-state lighting (SSL) applications. Suitable for designs from 4 W to 55 W, SSL driver ballasts based on LinkSwitch-PH ICs easily satisfy ENERGY STAR® and EN61000-3-2 class C and D requirements.

A new reference design featuring LinkSwitch-PH in the new eSIP-L package, RDR-257, describes a non-isolated, power-factor corrected, low-THD, high-efficiency LED driver circuit that fits inside a T8 tube fixture. The design powers an LED string with a nominal voltage of 36 V at a current of 330 mA, and operates from an input voltage range of 90 VAC to 265 VAC.

Comments Andrew Smith, product marketing manager at Power Integrations: “Competing T8 power supply solutions occupy the full diameter of the tube and several inches of tube length leaving a dark patch on one or sometimes both ends of the tube. PI’s new low-profile, eSIP-L package enables the power supply to be positioned on the underside of the LED PCB, with space on the front of the panel for LEDs. This facilitates even, consistent lighting across the whole length of the tube, resulting in better aesthetics and a discernibly better light distribution.”

LinkSwitch-PH samples in the eSIP-L package are available now, priced from $1.01 for 10,000-piece quantities. The product datasheet, reference designs, and introductory videos are available on the Power Integrations website at

About Power Integrations:
Power Integrations is the leading supplier of high-voltage integrated circuits used in energy-efficient power conversion. The company's innovative technology enables compact, energy-efficient power supplies in a wide range of electronic products, in AC-DC, DC-DC, and LED lighting applications. Since its introduction in 1998, Power Integrations' EcoSmart™ energy-efficiency technology has saved an estimated $5 billion of standby energy waste and prevented millions of tons of CO2 emissions. The company's Green Room web site provides a wealth of information about "energy vampires" and the issue of standby energy waste, along with a comprehensive guide to energy-efficiency standards around the world. Reflecting the environmental benefits of EcoSmart technology, Power Integrations’ stock is included in The Cleantech Index® and the NASDAQ® Clean Edge® Green Energy Index. For more information, please visit