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Original question:

DLP2010EVM-LC: MIPI DSI on LPD 2010

DLPA2000: DLPDLCR2010EVM modified with external light source and DLPA2000

Rasmus Backman
Prodigy 150 points
Part Number: DLPA2000
Other Parts Discussed in Thread: DLPC3430, DLP2010, DLPA3000

Hello,

I'm almost done with the board with MIPI-DSI interface I asked about earlier.

My application uses the DMD in an custom optical package, illuminated by a single laser diode driven by a separate current source. Optically, this works well.

But I am not sure how to treat the LED driver in the DLPA2000, since we won't use it. For our final design, can we just leave the LED power converter and LED connections of the DLPA2000 unattached? Or will we need to attach some dummy load to the LED drivers? 

Best regards,

Rasmus

  • 0
    TI__Mastermind 20045 points
    Hello Rasmus,

    I will have to check with my team and get back to you. Generally we require the use of the DLPA driver for the LED/laser driver. May I ask what the reason is this doesn't work for your application?

    Thanks,
    Kyle
  • 0 in reply to Kyle Rakos
    Prodigy 150 points
    Hello Kyle,

    the high voltage required by our laser could not be achieved by the DLP controller with the input voltage limitations we are working with.

    Regards,
    Rasmus
  • 0 in reply to Rasmus Backman
    TI__Mastermind 20045 points
    Hello Rasmus,

    Thank you for clarifying. Will you be using a color wheel with your single laser? Or is this a monochrome application?

    Thanks,
    Kyle
  • 0 in reply to Kyle Rakos
    Prodigy 150 points
    This is strictly monochrome.
  • 0 in reply to Rasmus Backman
    TI__Mastermind 20045 points
    Hi Rasmus,

    I am still looking into this. Could you please confirm the Vf of the laser diode?

    Thanks,
    Kyle
  • 0 in reply to Kyle Rakos
    Prodigy 150 points

    Hello Kyle,

    Vf is up to 7V.

    Thank you,

    Rasmus

  • 0 in reply to Rasmus Backman
    TI__Mastermind 20045 points
    Hello Rasmus,

    The closest PMIC we have would be the DLPA3000 which has a Vf of 6.3V. Since the DLP2010 is intended to be used as part of a complete DLP® chipset, it is generally required to use a supported DLPAxxxx PMIC/LED driver to control the illumination source. Therefore, if you chose to use a separate illumination driver, we will not be able to provide support related to that aspect of your product. Note that while you may be able to use the DLPC3430 LED select signals to determine when to turn on the laser, you will not be able to control the current (and therefore brightness) from the DLP chipset. Therefore you will not be able to use all of the IntelliBright™ algorithms included with the chipset.

    Thanks,
    Kyle
  • 0 in reply to Kyle Rakos
    Prodigy 150 points

    Hello Kyle,

    thank you for your thorough reply.

    We understand that we will lose some of the excellent features the DLPC3430 offers with this setup. We would have loved to use the built-in current control, but the choice of laser diode is unfortunately out of our hands.

    I understand that you can't support us on how to control the laser diode for our specific application, but that is already solved and tested. Since we are running monochrome only, we don't seem to need synchronization between the laser and the DMD.

    The big question for us is: can we leave the unused LED boost converter and outputs floating on the DLPA2000? Or do we need to connect it all up and add dummy loads to the LED outputs?

    Thank you,
    Rasmus

  • 0 in reply to Rasmus Backman
    TI__Mastermind 20045 points
    Hello Rasmus,

    I believe you will be able to leave them open and unconnected. However, it may be wise to add dummy loads during your prototyping phase to ensure there are no unexpected issues. You also may still want to have the option to use the LED select signals to control the laser so it's not illuminated at all times.

    Thanks,
    Kyle