• State TI Thinks Resolved
  • Locked Locked
  • Replies 4 replies
  • Answers 1 answer
  • Subscribers 30 subscribers
  • Views 563 views
  • Users 0 members are here
Support feedback
Options
Options
Related

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.

DLP470TE: max temperature tolerant

Zhonghui Xu
Expert 5445 points
Part Number: DLP470TE

Hi team,

I got a question from customer.

" I recently purchased the DMD chip DLP470TEAAFXJ for my laser tv replacement due to white (stuck) pixel and black (dead) pixel.
While I set my machine in max brightness , the temperature read nearly 50 celcius. If I turn the brightness to medium 5 it will maintain at around 42.9c which is optimal.

I'm not sure will the DMD overheated if keep working in 50c in a long time? Please advise.

My laser tv model is Fengmi 4k Max."

Thank you very much for your help.

Best regards,

  • 0
    TI__Prodigy 530 points

    Hi  , Thank you for posting your query on E2E forums. I have assigned a member of our team to provide feedback and timeline .

    Please note that all our engineers are currently on a New Year break. So please expect delays in responses.

    Regards,

    Pavan

  • 0 in reply to Venkata Pavan Mahankali
    TI__Expert 5445 points

    Hi Pavan,

    Thank you for your help.

    I will waiting for the reply.

    Best regards,

  • 0 in reply to Zhonghui Xu
    TI__Prodigy 530 points

    Hi , 

                     While the experts get back on the suggestions , Can you add few more details on how the temperature is measured or calculated. Is this the DMD array temperature?

                    As per datasheet, the DLP470TE recommended maximum temperature can vary from 40c to 70c depending on the micromirror Landed Duty cycle. I would recommend to calculate the Array Temperature of the DMD and use the Maximum temperature derating curve as described in the datasheet "Figure 6-1 Maximum Recommended Array Temperature - Derating Curve" to identify the safe operating temperature in your case.

  • 0 in reply to Venkata Pavan Mahankali
    TI__Intellectual 2580 points

    Pavan is correct. The min an max temperatures supported/allowed are specified in the DMD Datasheet in the Environmental section.  

    Tarray, Twindow, |Tdelta|, as well as Max Lumens or optical power are all required to be met in the product.  The datasheet includes data on how to calculate Tarray, which requires both a temperature and a lumens measurement.  

    Assuming you are measuring 50C at TP1 (as specified in the Datasheet), and the screen lumens is <= 4000, the array temperature (Tarray) should be less than ~60C.  Assuming typical usage with video content and no significant 0/100 and 100/0 duty cycles (i.e. not always running full black or full white), that should be OK.  This is assuming all of the other environmental conditions are met as well... Twindow < 85C, |Tdelta| < 14C, etc.. See the DMD Datasheet for more information on temperatures, duty cycle, and life time.

    These temperatures can be tricky to measure properly. This should have all been validated by the projector manufacturer during the design process.

    Regards,
    Gary