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DLP9500: Maximum illumination power density on DMD

Part Number: DLP9500

I have looked through the user manual for multiple DMD chips and found that the maximum illumination on the DLP9500 is around 11W/cm^2 or 26.6W in the 400-420 nm range, but is only thermally limited in the rest of the visible spectrum. I was also looking at a projector from your digital cinema partner, BARCO, which uses a 1.38" 4K DMD along with up to a 7kW lamp. Assuming a 5% luminous efficiency for the lamp, that results in 350W on the chip, or 69.2W/cm^2. I am assuming this high power density is largely at higher wavelengths than 400-420 nm so the 11W/cm^2 maximum power density isn't a limiting factor and additionally, the chip must have some thermal management system to control the maximum temperature. I have a few questions: can your smaller chips also come with some kind of cooling system to operate at similar power densities and if so do you know of an estimated maximum flux these chips can handle with appropriate cooling? (If this is a better question for DLi or another partner, let me know). Also, I am hoping to operate at near-UV wavelengths, is 11W/cm^2 really the maximum flux at those wavelengths or can that value also be raised with appropriate cooling?

Thanks,

Nick

  • Nick

    Each of the DMD data sheets on TI.com will have guidelines regarding the thermal limits in the specifications section of the data sheets.

    Typically when operating above 420 nm the DMDs are limited only by the thermal properties of the package and thermal design of end product.

    Typically when a DMD is going to be used with wavelengths below 420 nm TI will include extra guidelines to help guide the end product design so that the DMD performance is optimized.

    Typically lower operating temperatures will ensure the best performance of a DMD when used below 420 nm. Just ensure your thermal controls do not drop the DMD array or package test point temperatures below the data sheet guidelines.

    It is also a very good idea to follow the datasheet recommendations of running a 50/50 on/off pattern on the DMD when the device is not actively illuminated in the end application

    Operating the DLP9500FLN with an optical power greater than the data sheet guidelines is not recommended