Littelfuse Introduces PLED5HT Series Open LED Protector
Aug 24, 2010 Littelfuse, Inc. has introduced the PLED5HT Series circuit protection device that increases LED lighting string reliability. This new device, available in an SOT-89 package, maintains LED string brightness while improving LED reliability for the growing market for outdoor LED lighting and high-intensity LED applications with current draw up to 700 mA.
The PLED5HT Series design is a voltage-triggered electronic shunt device that provides a current bypass in the case of a single LED failing into an open circuit condition. The design ensures against the loss of an entire string of LEDs due to the failure of a single LED. It also provides protection against electrostatic discharge (ESD) events and accidental reverse battery or power connection.
PLED5HT Series applications are LED advertising and traffic signs, roadway/pathway/runway lighting, and aircraft and emergency lighting.
Key features and advantages:
Brightness of the LED string is maintained if a single LED in the string fails open.
Small SOT-89 footprint - easy to place, good heat-dissipation.
A PLED5HT Series device has a lower power dissipation than the LED.
3-in-1 protection (open-defect protection, ESD protection and reverse battery/power supply polarity protection).
Open LED defects can be controlled without negatively affecting power supply voltage.
Fast switching compatible with pulse width modulation supplies.
Auto-reset after power cycle or if the LED heals itself or is replaced.
Author: BIO T&T
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