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TFP410 Thermal Problem

Hans Maurer
Prodigy 20 points
Other Parts Discussed in Thread: TFP410

Hi there,

I am using the TFP410 on a Prototyp Board wich i intend to use for testing the RGB TTL Display-Output on our Industrial-PCs.

Now i figured it only works  when i run it for about 5-10min and it gets "warm". At normal room temperature (22°C) i get nothing on the DVI outputs.

I used Cooling Spray to reproduce the conditions, but when its farly cooled down it works again! So it only don't work in a specific temperature range around 20°C.

I use the device without I2C, and i think i have all the settings right.

The video input is 800x480 with 29.55MHz Pixel Clock.

i can provide the schemtics, if needed.

Any Idea?

Hans

  • 0
    TI__Guru* 76130 points
    Hello,
    When you say "nothing on the DVI outputs" what do you mean? Can you provide a scope capture?
    Does the issue happen with multiple DVI panels?
    What is the state of the input clock when the issue happens? Can you send a scope capture?
    Does the issue happens with multiple clock frequencies? Can you try a frequency "far away" of the 29MHz? For example 75MHz.
    How warms does the device is getting on top?
    Can you see a significant current draw increment when the issue happens?
    This sounds like a GND issue, can you share your schematics and layout?
    If you don't want to post them here I can directly contact you by email.

    Regards
  • 0 in reply to Elias Villegas M.
    Prodigy 20 points
    Hi,
    I measured the output (TX2+, TX2- for example), but i couldn't see any diverences. I will try and capture a usefull scope-picture.
    I also tried a few different DVI Panels. I am now using a DVI to USB Framegrabber (epiphan DVItoUSB3.0), wich is very forgiving. With every Panel so far, i had the same results.

    The input clock also don't seems to change when the issue is happening. I only tried 29.55Mhz so far. I will try it soon with higher frequencys.

    The surface of the TFP410 is arround 23 to 26°C when the issue happens.

    Can you give me your email? i will send you the schematic and layout.

    Thanks