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AB188 Folha de dados(PDF) 3 Page - Lumileds Lighting Company

Nome de Peças AB188
Descrição Electrónicos  Circuit Design and Layout Practices to Minimize Electrical Stress
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Fabricante Electrônico  LUMILEDS [Lumileds Lighting Company]
Página de início  http://www.luxeon.com
Logo LUMILEDS - Lumileds Lighting Company

AB188 Folha de dados(HTML) 3 Page - Lumileds Lighting Company

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AB188 LUXEON Automotive LEDs Application Brief 20170530 ©2017 Lumileds Holding B.V. All rights reserved.
3
1. Electrical Overstress
LEDs have rated maximums and minimums for current and voltage, which help ensure long life for LED operation.
Electrical Overstress (EOS) is any condition which exceeds these rated limits (see Figure 1).
Electrical Overstress can present itself to an LED array in two forms, either as excess voltage or excess current
Figure 1. Damage to LED wire bond due to Electrical Overstress (EOS).
Because voltage and current are interrelated, it is not always possible to identify whether a high voltage or high current
caused a failure.
CurrentscanflowthroughanLEDarrayintwoways:differentialmodeandcommonmode(seeFigure2).Differentialmode
currents can be very destructive. However, a well-designed LED driver has built-in controls and protection to eliminate any
differentialmodefaultcurrents.Commonmodecurrentsaremoreinsidious,astheyarelargelydependentonthecircuit
board layout, materials used, etc. Most of the guidelines in this paper are geared towards minimizing the potential for
common mode fault currents.
Figure 2. Differential mode (top) and common mode (bottom) currents.
2. Reverse Polarity
TherearetwomethodsofminimizingtheeffectsofreversepolarityonanLEDarray.LEDsshallbedrivenusingaforward
bias for conducting current and emitting light. Lumileds LEDs are not designed to be driven in reverse bias, and typical


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