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CS8183 Datasheet(PDF) 7 Page - ON Semiconductor |
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CS8183 Datasheet(HTML) 7 Page - ON Semiconductor |
7 / 8 page CS8183 http://onsemi.com 7 IOUT1(max) is the maximum output current, for the application, IOUT2(max) is the maximum output current, for the application, IQ is the quiescent current the regulator consumes at IOUT(max). Once the value of PD(max) is known, the maximum permissible value of RΘJA can be calculated: R QJA + 150 °C * TA PD (2) The value of RΘJA can then be compared with those in the package section of the data sheet. Those packages with RΘJA’s less than the calculated value in equation 2 will keep the die temperature below 150 °C. In some cases, none of the packages will be sufficient to dissipate the heat generated by the IC, and an external heat sink will be required. Figure 15. Dual Output Regulator with Key Performance Parameters Labeled IIN IOUT IQ SMART VOUT VIN REGULATOR Control Features Heatsinks A heatsink 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 will have a thermal resistance. Like series electrical resistances, these resistances are summed to determine the value of RΘJA: R QJA + RQJC ) RQCS ) RQSA (3) where: RΘJC = the junction−to−case thermal resistance, RΘCS = the case−to−heatsink thermal resistance, and RΘSA = the heatsink−to−ambient thermal resistance. RΘJC appears in the package section of the data sheet. Like RΘJA, it is a function of package type. RΘCS and RΘSA are functions of the package type, heatsink and the interface between them. These values appear in heat sink data sheets of heat sink manufacturers. |
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