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HSMM-A101-R00J1 Datasheet(PDF) 16 Page - Broadcom Corporation. |
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HSMM-A101-R00J1 Datasheet(HTML) 16 Page - Broadcom Corporation. |
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16 / 17 page  HSMx-A10x-xxxxx Data Sheet PLCC-2, Surface Mount LED Indicator Broadcom AV02-0198EN 16 If the LED is intended to be used in harsh or outdoor environment, protect the LED against damages caused by rain water, water, dust, oil, corrosive gases, external mechanical stresses, and so on. Thermal Management The optical, electrical, and reliability characteristics of the LED are affected by temperature. Keep the junction temperature (TJ) of the LED below the allowable limit at all times. TJ can be calculated as follows: TJ = TA + RθJ-A x IF x VFmax where; TA = ambient temperature (°C) RθJ-A = thermal resistance from LED junction to ambient (°C/W) IF = forward current (A) VFmax = maximum forward voltage (V) The complication of using this formula lies in TA and RθJ-A. Actual TA is sometimes subjective and hard to determine. RθJ-A varies from system to system depending on design and is usually not known. Another way of calculating TJ is by using the solder point temperature, TS as follows: TJ = TS + RθJ-S x IF x VFmax where; TS = LED solder point temperature as shown in the following figure (°C) RθJ-S = thermal resistance from junction to solder point (°C/W) IF = forward current (A) VFmax = maximum forward voltage (V) Figure 16: Solder Point Temperatures on PCB TS can be easily measured by mounting a thermocouple on the soldering joint as shown in preceding figure, while RθJ-S is provided in the data sheet. Verify the TS of the LED in the final product to ensure that the LEDs are operating within all maximum ratings stated in the data sheet. Eye Safety Precautions LEDs may pose optical hazards when in operation. Do not look directly at operating LEDs because it might be harmful to the eyes. For safety reasons, use appropriate shielding or personal protective equipment. Ts point Package mark |
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