How do small encyclopedia: insert radiator selection

by:Positioning     2021-06-04
Insert radiator is one of the members of the aluminum radiator, insert the cylinder is made of aluminum radiator pull stretching mold material, according to the need to cut into the required length, fins is made of aluminum plate cutting molding, then he became a insert radiator fins inserted into the cylinder. So for insert radiator selection, in 7850, for example. Set I = 350 ma, vin = 12 v, the power dissipation pd = ( 12 v - 5 v) * 0. 35 = 2。 45w。 According to the T0 - 220 package thermal resistance of theta JA = 54 ℃ / W, temperature is 132 ℃, a room temperature 25 ℃, then will reach 7850 thermal protection point 150 ℃, 7850 will disconnect the output. Correct design method is: first, determine the highest temperature, such as 60 ℃, 7850, the highest junction temperature TJMAX = 125 ℃, then allow the temperature is 65 ℃, and the requirements of the thermal resistance is 65 ℃ / 2. 45 W = 26 ℃ / W, check the heat resistance of 7850, T0 - 220 package thermal resistance of theta JA = 54 ℃ / W, are higher than the required value, cannot use, so must add heat sink, when it comes to add heat sink, in the information should be combined with 4 ℃ / W shell to the heat sink thermal resistance, thermal resistance calculation heat sink should have also is very simple, like resistors in parallel, 54 / / X = 26, X = 50 ℃ / W, actually this value is very large, as long as a heat sink can be satisfied. Insert the radiator's waiting for you to choose and buy! 15 years committed to the development of the heat energy, the main production insert radiator, aluminum radiator, plate radiator, shovel radiator, frequency converter radiator, on-line soft start radiator, etc. , you have a problem, I'll solve! Service hotline: 0577 62627555.
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