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CS5257A-1 데이터시트(PDF) 9 Page - ON Semiconductor |
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CS5257A-1 데이터시트(HTML) 9 Page - ON Semiconductor |
9 / 11 page CS5257A−1 http://onsemi.com 9 PD(max) + (VIN(max) * VOUT(min))IOUT(max) ) VIN(max) IIN(max) A heat sink effectively increases the surface area of the package to improve the flow of heat away from the IC and into the surrounding air. Each material in the heat flow path between the IC and the outside environment has a thermal resistance which is measured in degrees per watt. Like series electrical resistances, these thermal resistances are summed to determine the total thermal resistance between the die junction and the surrounding air, RqJA. This total thermal resistance is comprised of three components. These resistive terms are measured from junction to case (RqJC), case to heat sink (RqCS), and heat sink to ambient air (RqSA). The equation is: RQJA + RQJC ) RQCS ) RQSA The value for RqJC is 1.4°C/watt for the CS5257A−1 in both the TO−220−5 and D2PAK−5 packages. For a high current regulator such as the CS5257A−1 the majority of heat is generated in the power transistor section. The value for RqSA depends on the heat sink type, while the RqCS depends on factors such as package type, heat sink interface (is an insulator and thermal grease used?), and the contact area between the heat sink and the package. Once these calculations are complete, the maximum permissible value of RqJA can be calculated and the proper heat sink selected. For further discussion on heat sink selection, see our application note “Thermal Management,” document number AND8036/D, available through the Literature Distribution Center or via our website at http://www.onsemi.com. |
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