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NCV4266-2CST33T3G Datasheet(PDF) 9 Page - ON Semiconductor |
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NCV4266-2CST33T3G Datasheet(HTML) 9 Page - ON Semiconductor |
9 / 11 page NCV4266−2C www.onsemi.com 9 Calculating Power Dissipation in a Single Output Linear Regulator The maximum power dissipation for a single output regulator (Figure 20) is: PD(max) + [VI(max) * VQ(min)]IQ(max) ) VI(max)Iq (eq. 1) where VI(max) is the maximum input voltage, VQ(min) is the minimum output voltage, IQ(max) is the maximum output current for the application, Iq is the quiescent current the regulator consumes at IQ(max). Once the value of PD(max) is known, the maximum permissible value of RqJA can be calculated: R qJA + 150oC * 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 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 IQ II Figure 20. Single Output Regulator with Key Performance Parameters Labeled VI VQ } 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 RqJA: R qJA + RqJC ) RqCS ) RqSA (eq. 3) where RqJC is the junction−to−case thermal resistance, RqCS is the case−to−heatsink thermal resistance, RqSA is 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 data sheets of heatsink manufacturers. Thermal, mounting, and heatsinking considerations are discussed in the ON Semiconductor application note AN1040/D. |
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