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Moteur de recherche de fiches techniques de composants électroniques |
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Moteur de recherche de fiches techniques de composants électroniques |
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MIC2299 Fiches technique(PDF) 13 Page - Micrel Semiconductor |
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MIC2299 Fiches technique(HTML) 13 Page - Micrel Semiconductor |
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13 / 14 page  Micrel, Inc. MIC2299 October 2007 13 M9999-101907-B LED Protection The operation of the Power LED must be limited to short pulses to prevent overheating. This is usually controlled by the micro controller in a typical application. For further fail-safe protection, or where a micro controller is not used, the temperature of the LED can be limited by the addition of an NTC thermistor. The value should be >100k Ω at its maximum safe operating temperature. This will then limit current drive to the LED as temperature rises further and prevents overheating. This thermistor should be connected directly from BRT to GND. Reference Figure 10. Figure 10. LED Thermal Protection |
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