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dm6467tzut1 high temperature test

hi,

now i am having a high temperature test with dm6467tzut1 .i found  that when the temperature high than 60℃ more or less ,the whole board power dispatch is about 12W. the voltage is 12V DC . at this time ,it will hang up soon。at normal , its power dispatch is about 7~8W. but i find that the normal temperature is 0~85℃ . i want to known that in practice the normal working temperature is how much ? how can i let it work between 60 ℃ and  80℃。 

 

thanks

 

bset regards