ZHCSA87F August 2012 – June 2019 DLP7000
The relationship between micromirror array temperature and the reference ceramic temperature (thermal test point TP1 in Figure 18) is provided by the following equations:
The electrical power dissipation of the DMD is variable and depends on the voltages, data rates, and operating frequencies. A nominal electrical power dissipation to use when calculating array temperature is 4.4 Watts. The absorbed power from the illumination source is variable and depends on the operating state of the micromirrors and the intensity of the light source. The conversion constant CL2W is based on the DMD input illumination characteristics. It assumes a spectral efficiency of 300 lumens/Watt for the projected light and an illumination distribution of 83.7% on the active array and 16.3% on the array border. The equations shown above are valid for a system with a total projection efficiency through the projection lens from the DMD to the projection surface of 87%.
Sample calculation for typical application: