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AB20-3B Datasheet(PDF) 2 Page - Lumileds Lighting Company |
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AB20-3B Datasheet(HTML) 2 Page - Lumileds Lighting Company |
2 / 18 page 2 Production Forward Voltage Data Overview SuperFlux and SnapLED emitters are categorized for luminous flux, color, and forward voltage in order to improve matching within an LED array. The use of LED emitters from a single forward voltage category allows LED emitters to be connected in parallel to simplify external drive circuitry. For complete details on the Lumileds Lighting SuperFlux LED emitter category ranges, please see AB207. The data shown below represents production forward voltage test data taken at five forward currents for the SuperFlux emitters—30 µA, 1 mA, 8 mA, 32 mA, and 70 mA for emitters built from 8/01 to 12/01 and future data is subject to change. For the SnapLed150 emitters, production forward voltage test data is taken at six forward currents—30 µA, 1 mA, 8 mA, 32 mA, 70 mA, and 150 mA for emitters built from 8/01 to 10/01 and future data is subject to change. While this data was only taken on SuperFlux and SnapLED150 emitters, the SuperFlux data would also apply for SnapLED 70 emitters. For each SuperFlux and SnapLED150 product type, the data for these units were sorted into the different forward voltage categories using the non guard banded production test limits. Then, the statistics (i.e. mean, standard deviation, minimum and maximum) were compiled for each forward voltage category. Note that the data represents production data for about 60,000 to 130,000 units and 10 to 25 production lots per part number. The data was chosen such that each lot represents a different AlInGaP wafer. In some cases, the forward voltage categories were so lightly populated that an insufficient number of data points were measured in order to generate statistical data. These forward voltage categories have been identified as “insufficient” data in the tables. A wide variety of forward current models can be generated using the forward voltage data shown. Linear forward voltage models can be generated using two adjacent test currents (i.e. 70 and 150 mA, 32 mA and 70 mA, or 8 mA and 32 mA) using the equations shown in AB203. Diode equation forward voltage models (as described in AB203A) can be generated using three adjacent test currents (i.e. 32, 70 mA, and 150 mA; 8 mA, 32 mA, and 70 mA; or 1 mA, 8 mA, 32 mA) using the equations shown in AB20 3A. Nominal forward voltage models would be generated using the “mean” or “50%tile” values of forward voltage at the desired test currents. “Worstcase” circuit analyses can be generated with two forward voltage models that simulate the lowest forward voltage and the highest forward voltage at any forward current. For example the minimum forward voltage can be estimated using the “0.1% tile” or the “1%tile” forward voltage values and the maximum forward voltage can be estimated using the “99.9%tile” or the “99%tile” forward voltage values. Note that the number of units corresponding to a normal distribution +/ 3 standard deviations (i.e. 99.74% of the total population) corresponds roughly to the number of units in the range from “0.1%tile” to “99.9% tile” (i.e. 99.8% of the total population). |
Similar Part No. - AB20-3B |
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Similar Description - AB20-3B |
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