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Question about maximum illumination power density

Kazuhiro Sato94818
Prodigy 115 points
Other Parts Discussed in Thread: DLP5500

Hello,

I looked from the dlp5500 document (http://www.ti.com/lit/ds/symlink/dlp5500.pdf)
that the maximum illumination power density is :
-wavelength < 420 nm, 20mW/cm2
-wavelength > 700 nm, 10mW/cm2

But our biggest concern is VIS(480nm). I looked in the data sheet for the dlp5500 and followed the calculation in the page 19, so that maximum power density was estimated around 100W/cm2.The power density between VIS and UV(IR) is in a different class.Is calculated value reasonable?

I am looking forward to hearing from you.

Regards,

 

Kazuhiro

 

  • 0
    TI__Guru 54705 points

    Hello Kazuhiro-san,

    Welcome to the DLP section of the TI-E2E community.

    Your numbers may be correct if you are able to provide a sufficient cooling system to keep the DMD array temperature with the specification in the ABSOLUTE MAXIMUM RATINGS Table on page 11 -- AND -- it must also not exceed the temperature gradient of 10 C specified in the table (see note 7 of this table). 

    Note 10 of the table should really say, "Limited only by the resulting micromirror array temperature AND the temperature gradient as measured in your system."

    If both criteria are met then you are operating within the specifications listed.  The DMD is designed for use in the visible so that the power density allowable in the visible is much greater than in other regions of the spectrum. 

    You may find it challenging to reach values higher that 25 W/cm2 without exceeding the temperature gradient specification. 

     

    Fizix

  • 0 in reply to Fizix
    Prodigy 115 points

     Hello Fizix-san,

     

    Thank you for your quick reply.

    I was relieved to hear it.Because we will actually use the device power density less than 25W/cm2.

    And I’m curious how UV and IR illumination power density are decided.If possible, would you tell that please?

     

    In addition to the above, I would like to know approximate lifetime of the DMD device.So would you tell me that too when we continue using the device with specifications in the list?

     

    Regards,

    Kazuhiro

     

  • 0 in reply to Kazuhiro Sato94818
    TI__Guru 54705 points

    Hello again Kazuhiro-san,

    This is not an easy question to answer.  Please look at the following thread to help understand why we do not state lifetime's for DMD devices:

    http://e2e.ti.com/support/dlp__mems_micro-electro-mechanical_systems/f/94/t/136635.aspx

    Hopefully that discussion helps in understanding how system design and use affects lifetime.

     

    Fizix