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AN4501 bảng dữ liệu(PDF) 38 Page - STMicroelectronics

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AN4501 bảng dữ liệu(HTML) 38 Page - STMicroelectronics

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Selection of the switching MOSFET
AN4501
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DocID026394 Rev 1
1.
Initial estimation of TJ (noted TJ1). For example, we can use TAMB as a starting point.
2.
Calculation of the corresponding Rdson, using the Rdson at 25°C and the thermal
coefficient
α
3.
Calculation of the conduction losses in M1
4.
Calculation of the total power losses in M1
5.
Calculation of the resulting junction temperature (noted TJ2)
6.
Calculation of the RDSON corresponding to TJ2
7.
The calculation is finished if the difference between RDSON at TJ1 and TJ2 is smaller
than the required precision. The final RDSON and junction temperature are respectively
RONM1@TJ2 and TJ2.
If the difference between Rdson at TJ1 and TJ2 is higher than the required precision we
substitute TJ1 by TJ2 and we restart a new iteration.
Figure 18. Flowchart for the iterative calculation of the junction temperature of M1



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