Thermal Calculation for Linear Regulator Linear Regulator Series Application Note
The loss in linear regulators increases as the difference between the input and output voltages increases. Since most of the loss is converted to heat, a very large amount of heat may be generated in some conditions. To utilize linear regulators effectively at several watts or more, it is always necessary to consider the issue of heat. The temperature increases above the maximum rating for the junction temperature of the IC chip, making it impossible to achieve thetarget output current. This application note explains how to estimate the junction temperature of the IC chip, and provides calculation examples for the ROHM’s standard circuit boards.
Thermal calculation requires information on the IC loss power, the thermal resistance or thermal characteristics parameter of the package, the ambient temperature, and the temperature at the center of the package surface. From these values, the junction temperature of the IC chip is estimated to confirm that the temperature is below the absolute maximum rating.
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Application note & Design Guide |
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Please see the document for details |
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TO252-3 |
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English Chinese Chinese and English Japanese |
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2017.2 |
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Rev.001 |
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AEK59-D1-0434-0 |
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703 KB |
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