Inc., the global leader in circuit protection, has introduced the
PLEDxUx Unidirectional Series Open LED Protector, the latest addition to
the company's broad portfolio of PLED Open LED protection devices. It
provides a switching electronic shunt path when one LED in a string
fails as an open circuit. PLED devices are connected in parallel with
each LED in a series string. If one LED fails, the PLED connected to it
turns on and carries the current that would have gone through the failed
LED, so the remainder of the string continues to function. PLEDxUX
devices provide reverse battery/power polarity protection for greater
LED reliability. Typical applications include street, subway, runway,
and tunnel lighting, as well as headlights, roadside warning lights, and
PLEDxUx Series devices are compatible with 1-watt LEDs, nominally
350mA@3V. Two different low-profile packages maximize heat dissipation
and layout flexibility, so they're suitable for dense board
applications. In contrast with earlier open LED protection solutions
such as silicon controlled rectifiers (SCRs) and zener diodes, the
PLEDxUx Series offers higher reliability and lower maintenance
requirements. For example, SCRs are usually large and require additional
components like resistors to set the trigger or turn-on voltage, and
their trigger voltage will vary widely over temperature. Zener diodes
create additional power dissipation once the LEDs they're protecting
fail open. They are also not rated for large DC currents, which can
shorten life or lead to catastrophic failure.
"The PLEDxUx Series is a great chice for outdoor applications that
demand high reliability and low maintenance," said Betty Li, product
manager for LED Protectors. "It also offers comprehensive voltage
coverage, especially higher voltage offerings that can allow designers
to create a lower cost solution by placing a single PLED component
across two or three LEDs, rather than a single LED."
PLEDxUx Series LED Protectors are available in quantities of 5,000 (QFN
3x3 package) and 2,500 (DO-214AA package), in standard tape and reel
packaging. Samples are available now for bulk orders; sample requests
can be placed through authorized Littelfuse distributors worldwide. For
a listing of Littelfuse distributors, please visit Littelfuse.com.
For More Information
Additional information is available on the PLEDxUx Series product
page and datasheet.
If you have technical questions, please contact: Betty Li, Product
Manager, LED Protectors, firstname.lastname@example.org.
Founded in 1927, Littelfuse is the world leader in circuit protection
with growing global platforms in power control and sensing. The company
serves global customers in the electronics, automotive and industrial
markets with technologies including fuses, semiconductors, polymers,
ceramics, relays and sensors. Littelfuse has over 7,000 employees in
more than 35 locations throughout the Americas, Europe and Asia. For
more information, please visit the Littelfuse website: littelfuse.com.
Application image (high resolution)
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