05703R777780075CBBF SIMPLELED, 05703R777780075CBBF Datasheet - Page 4

• Manufacturer Part Number: 05703R777780075CBBF
• Description: SQUARE, 4 LED, NW, 4000K, 300LUMEN
• Manufacturer: SIMPLELED
• Series: SimpleLEDr

Specifications of 05703R777780075CBBF

• Led Module Type: Board+LED+Connector
• Led Colour: Neutral White
• Cct: 4000K
• Luminous Flux @ Test: 300lm
• Power Module Configuration: Square
• Supply Voltage: 12V

therMal stateMent & asseMBlY instruCtiOns
therMal ManageMent
note: all specifications are subject to change without notice.
the light engines must operate under proper environmental conditions and the operating ambient air temperature must not exceed a
certain maximum which cause the leDs to exceed the maximum junction temperature as stated in Philips lumileds datasheet. a heat sink
must always be used when operating the light engines. the size of the heat sink depends on the amount of power consumed by the leDs.
the objective is to maintain the junction temperature below the maximum rating in Philips lumileds datasheet while also not exceeding
the maximum PCB temperature.
the light engine must be mounted on a flat heat sink using M3 screws. all screw holes must be used to attach the light engine to the heat
sink in order to provide proper heat transfer. also a thermal conductive interface must be used between the heat sink and light engine.
this thermal conductive interface could be a thermal conductive paste such as amasant12 from armack lottechnik or a thermal interface
material such as t-PCM 585 from laird.
the light engine must not be bent to avoid damaging the leD and/or dislodging the optics. all above specifications must be met in order
to qualify for the 3 year warranty.
the graphs below show the required thermal resistance of the heat sink based on the maximum operating ambient temperature, the drive
current and the maximum allowable PCB temperature. the maximum allowable tj is a function of the target lifetime of the light engine
and the leD current. this information can be found in the Philips lumileds reliability datasheet rD07.
For example, if the maximum ambient temperature is 35°C and the drive current is 500 ma, the heat sink should have a rth of 5.3 K/W to
meet the max PCB temperature requirement. this is shown in figure 1. With the known rth of the heat sink, the delta t from junction to
ambient can be determined in figure 2. a rth of 5.3 K/W has a delta t of 68 °C, which means that the leD has a tj of 103 °C.
With the same graphs the max operating ambient temperature and the junction temperature can also be determined if the thermal
resistance of the chosen heat sink is known.
note; the graphs show that not all combinations of tj and max ambient are possible.
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square light engine
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