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ML7924FA Datasheet(PDF) 9 Page - Micro Electronics |
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ML7924FA Datasheet(HTML) 9 Page - Micro Electronics |
9 / 10 page ( 3 ) Heat Radiation Balance (3-1) TO-220 with heat sink Where θjc : θjs : θCH : θHS : The relation between temperature and heat radiation quantity is shown below. Tj=PLOSS X (θjc+θCH +θHS) + Ta (℃ ) The heat produced in the IC is radiated to ambience through the package and the heat sink. The quantity of the heat radiation depends on the heat source temperature, ambient temperature and the thermal resistance of the package. Heat radiation balance model of the TO-220 with heat sink is shown as below. thermal resistance between IC chip (junction point) and the package backside connecting to the heatsink. thermal resistance between IC chip (junction point) and the package surface. thermal resistance between package backside and the heat sink including the condidtion of insulator, silicon grease and tighten torque. thermal resistance of the heat sink If the js is large enough compare with other thermal resistance, the js can be neglected and the heat radiation model can be mentioned as below. Tj Ta LOSS P Ambient Temperature Heat Source (junction) Temperature JC θθCH θHS θJS Heat Sink IC Package Face Side Resin Chip Package Back Side θJS θJC θCH θHS Tj LOSS P θJC θCH Ta θHS Page 9 of 10 |
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