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Description: 7805 as an example to illustrate the problem. Located I = 350mA, Vin = 12V, the power dissipation Pd = (12V-5V)* 0.35A = 2.45W TO-220 package in accordance with the thermal resistance θJA = 54 ℃/W, temperature is 132 ℃, located at 25 ℃, it will reach 7805' s thermal protection point 150 ℃, 7805 will disconnect the output
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