This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

DLP670S: Early DLP DMD failure under 385nm illumination and 24/7 use

Part Number: DLP670S
Other Parts Discussed in Thread: DLP9000XUV

In our testing we are experiencing very early failures of the DLP DMD chip with 385nm UV light in industrial 3D printing application and we want to understand 1. failure modes of this chip in the 385nm environment 2. which chips are best to operate 24/7 with 385nm 3. How can we mitigate failure so the chip can last 10k hours? (I am asking this since our light engine manufacturers are having life challenges and we are deciding if we should build our own light engine and source from TI).

How can I talk with a Ti expert about the DLP DMD chips to see how we can design the right environment for them to last 10k hrs at 385nm UV environment? thermal, electrical, duty cycle, etc

technical specifications, known failure modes, environmental requirements to improve life, etc

Most likely it is the failure of the light engine design (I'm thinking of heat sinking) but want to understand the DLP chip failure mode when illuminated with 385nm.

Our industrial 3D printers run 24/7 and each layer is illuminated with 385nm UV light from the DMD chip.

We are deciding to make our own light engine with a TI DMD chip or to help our suppliers to improve their design to improve the Ti chip life to get the proper guidance,

let me know if it possible to talk with a technical DLP DMD expert,

thank you

Michael

  • Hello Michael,

    Thank you for reaching out to us. Welcome to E2E forum!

    I have notified an expert about the thread. Please allow some time for us to get back.

    Thank you,

    With regards,
    Aishwarya

  • Michael

    The DLP670S DMD is not rated per the data sheet to operate with 385 nm light. The lowest wavelength it is specified to use is 420 nm.

    For an industrial 3D printer utilizing the 385 nm the TI DLP9000XUV https://www.ti.com/product/DLP9000XUV would be the correct DMD to use. The DLP9000XUV is similar in resolution to the DLP670S and is rated to work with UV wavelengths down to 355 nm

    Along with the DMD data sheet, there are several good app notes on TI.com covering the correct use of DMDs with UV wavelengths

    System Design Considerations Using TI DLP® Technology in UVA (363 – 420 nm) (Rev. A) is one of  the best.

    Key areas include:

    Thermal control ensuring the DMD array is below 30 deg. C

    Operating at or below the maximum optical power density listed in the data sheet, minimizing optical overfill

    Only illuminating the DMD with the UV light source when needed (do not use the DMD as an active shutter)

    Ensuring the average duty cycle of each micro mirror is 50/50