Led Design Guide Page 5 LED Design Guide

2015 Littelfuse LED Lighting Design Guide www.littelfuse.com LED Lighting Design Guide Safety and Reliability of LED Bulbs An LED lamp contains power conversion electronics (AC/DC), driver IC for the LEDs, a heat sink for thermal management and optics to optimize light quality. Since LED bulbs are intended to be form factor-compatible with current incandescent and CFL bulbs, they will have an AC/DC power supply circuit so they can operate from standard bulb "sockets." (See Figure 2 .) Parabolic Reflector Packaged LED Lens LED Driver Heat Sink Figure 2. Typical residential LED lamp construction. Equipment that is directly connected to AC mains (e.g. 120/220VAC) can be damaged by short circuit and overload conditions caused by component and/or circuit failures inside the bulb. In addition, lightning surges or load switching transients (originating outside the bulb) can create voltage spikes or ring waves that can stress and ultimately damage components, and render the bulb dead. Given that the value proposition for LED bulbs is not only lower energy usage, but longer lifetimes, it will be crucial that transient voltage protection is taken into account to eliminate field failures driven by the electrical environment. Safety and Reliability of LED Bulbs To view the video, visit: https://vimeo.com/39714285 5 Usha Patel, who leads Littelfuse's LED initiatives, describes how to use circuit protection devices to increase LED lighting reliability and safety.

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