Other Parts Discussed in Thread: DLPA2005, DLPA3000
I am using a light sensor to look at a white splash image displayed by the DLP3010EVM-LC. I have the LED current turned up to maximum (although it happens with the currents lower also, it just takes longer). At first everything looks as expected with the red, green, and blue components distinguishable:
yellow trace = Trigger Out 1
blue trace = light sensor
After a minute or two of stable output, and then over a period of 3-4 seconds, all three colors smoothly reduce in brightness and remain that way.
If I turn the LEDs off, wait a few seconds, and turn them back on then the LEDs behave normally again briefly but soon reduce in brightness. The longer I leave the LEDs off, the longer they behave normally when turned back on. I suspect some thermal limiting on the DLPA2005 but it's not clear from that device's documentation what could cause a sudden and stable reduction in brightness as opposed to just shutting down the driver completely.
Any ideas how I can fix this? My bigger problem is that I have seen this same behavior on our own design (which uses the DLPA3000) but because it's the same on TI's EVM the problem must be built into the chipset somewhere.
