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noisiness of the fan on DLP LightCrafter 4500 - take 2

Zuzanna Piwkowska
Prodigy 80 points


Hi all,

so far I got no reply to my inquiry concerning the level of noisiness of the cooling fan on the DLP LightCrafter 4500, and I figure it is not obvious to quantify, so I'll try to be more specific with my questions:

- can you hear the fan at all in a silent surrounding when you switch on the device?

- (this for the TI engineers) if necessary can you unplug/disable the fan when using the LEDs at lower currents, eg for light intensities comparable to the original DLP Lighcrafter (the one with no active cooling), or is this not recommended because of a different arrangements of the LEDs/heat sinks in the newer device?

Any insight on these topics would be very welcome!

Zuzanna

 

  • 0
    TI__Expert 6995 points

    Zuzanna,

    The fan makes some noise and is noticeable in a silent room. It is very low in volume, but I do not have a sound measurement equipment. I would say from my trained ears it is about 20-25dB. My board has a Sunon 1203PHV2 MagLev fan. You could find some data sheets on the web, but there might be added noise by the airflow through the fins.

    The fan is plugged on the side of the board. The LEDs on the LightCrafter 4500 are driven from 0.2A to 4.3A and are 70% bigger than the first LightCrafter. In contrast, the first LightCrafter's LEDs are driven from 60mA to 633mA. So there is significant differences in power. Moreover, the LED heat sinks were designed for horizontal air flow, so they would be in the wrong orientation for passive cooling.

    If you disconnect the fan and the heat sinks do not provide enough passive cooling, the LED's will burn out. Thus, we do not recommend this action. If you decide to disconnect the fan, we would strongly recommend that you measure the temperature at each LED (not at the heat sink, but at the heat plate behind the LED) to determine the amount of current that can be tolerated. The LED are described on an earlier post. You can find data sheets from OSRAM to find its specs.

    Best regards,

      Pedro