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NCV8502PDW80R2 Datasheet(PDF) 11 Page - ON Semiconductor |
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NCV8502PDW80R2 Datasheet(HTML) 11 Page - ON Semiconductor |
11 / 14 page NCV8502 Series http://onsemi.com 11 CALCULATING POWER DISSIPATION IN A SINGLE OUTPUT LINEAR REGULATOR The maximum power dissipation for a single output regulator (Figure 19) is: PD(max) + [VIN(max) * VOUT(min)]IOUT(max) ) VIN(max)IQ (eq. 1) where: VIN(max) is the maximum input voltage, VOUT(min) is the minimum output voltage, IOUT(max) is the maximum output current for the application, and IQ is the quiescent current the regulator consumes at IOUT(max). Once the value of PD(max) is known, the maximum permissible value of RqJA can be calculated: R QJA + 150 °C * TA PD (eq. 2) The value of RqJA can then be compared with those in the package section of the data sheet. Those packages with RqJA’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 heatsink will be required. SMART REGULATOR ® IQ Control Features IOUT IIN Figure 19. Single Output Regulator with Key Performance Parameters Labeled VIN VOUT } Figure 20. 16 Lead SOW (Exposed Pad), qJA as a Function of the Pad Copper Area (2 oz. Cu Thickness), Board Material = 0.0625 , G−10/R−4 40 70 90 100 0 Copper Area (mm2) 200 400 800 80 60 50 600 HEAT SINKS 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 will have a thermal resistance. Like series electrical resistances, these resistances are summed to determine the value of RqJA: R qJA + RqJC ) RqCS ) RqSA (eq. 3) where: RqJC = the junction−to−case thermal resistance, RqCS = the case−to−heatsink thermal resistance, and RqSA = the heatsink−to−ambient thermal resistance. RqJC appears in the package section of the data sheet. Like RqJA, it too is a function of package type. RqCS and RqSA 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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