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US1075CM Datasheet(PDF) 5 Page - UNISEM |
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US1075CM Datasheet(HTML) 5 Page - UNISEM |
5 / 5 page US1075 2-37 Rev. 1.0 9/14/99 V V V V I A T C IN O OUT A MAX = = = = ° 5 3 5 4 6 35 . . ( ) ( ) P I V V P . . . W D O UT IN O UT D = × − = × − = 4 6 5 3 5 6 9 θJC C W = ° 2 7 . / ( ) ( ) T T P . . . S J D = − × + = − × + = ° θ θ JC CS S T C 135 6 9 2 7 0 05 116 ∆T S A T T C = − = − = ° 116 35 81 Thermal Design The US1075 incorporates an internal thermal shutdown that protects the device when the junction temperature exceeds the maximum allowable junction temperature. Although this device can operate with junction tempera- tures in the range of 150 °C ,it is recommended that the selected heat sink be chosen such that during maxi- mum continuous load operation the junction tempera- ture is kept below this number. The example below shows the steps in selecting the proper Regulator heat sink for the worst case current consumption using Intel 200MHz microprocessor as the load . Assuming the following specifications : The steps for selecting a proper heat sink to keep the junction temperature below 135 °C is given as : 1) Calculate the maximum power dissipation using : 2) Select a package from the Regulator data sheet and record its junction to case (or Tab) thermal resistance. Selecting TO220 package gives us : 3) Assuming that the heat sink is Black Anodized, cal- culate the maximum Heat sink temperature allowed : Assume , θcs=0.05°C/W (Heat sink to Case thermal resistance for Black Anodized) 4) With the maximum heat sink temperature calcu- lated in the previous step, the Heat Sink to Air thermal resistance ( θsa) is calculated by first calculating the temperature rise above the ambient as follows : ∆T=Temperature Rise Above Ambient 5) Next , a heat sink with lower θsa than the one calcu- lated in step 4 must be selected. One way to do this is to simply look at the graphs of the “Heat Sink Temp Rise Above the Ambient” vs. the “Power Dissipation” and select a heat sink that results in lower temperature rise than the one calculated in previous step. The following heat sinks from AAVID and Thermaloy meet this crite- ria. Air Flow (LFM) 0 100 200 300 400 Thermalloy 6021PB 6021PB 6073PB 6109PB 7141D AAVID 534202B 534202B 507302 575002 576802B θ θ SA T D SA P C W = = = ° ∆ 81 6 9 117 . . / |
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