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NCV8665 Datasheet(PDF) 8 Page - ON Semiconductor |
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NCV8665 Datasheet(HTML) 8 Page - ON Semiconductor |
8 / 11 page NCV8665 http://onsemi.com 8 VI VQ VD VRO Reset Delay Time Reset Reaction Time Power−on−Reset Thermal Shutdown Voltage Dip at Input Undervoltage Secondary Spike Overload at Output < Reset Reaction Time t t t t VQ,rt Upper Timing Threshold VDU Lower Timing Threshold VDL dVD dt + Reset Charge Current CD Figure 11. Reset Timing Calculating Power Dissipation in a Single Output Linear Regulator The maximum power dissipation for a single output regulator (Figure 12) is: PD(max) + [VI(max) * VQ(min)]IQ(max) (1) ) VI(max)Iq 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: RqJA + 150C * TA PD (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 NO TAG 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 12. 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: RqJA + RqJC ) RqCS ) RqSA (3) |
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