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MPC866PCZP100A bảng dữ liệu(PDF) 13 Page - Freescale Semiconductor, Inc

tên linh kiện MPC866PCZP100A
Giải thích chi tiết về linh kiện  Hardware Specifications
PDF  96 Pages
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nhà sản xuất  FREESCALE [Freescale Semiconductor, Inc]
Trang chủ  http://www.freescale.com
Logo FREESCALE - Freescale Semiconductor, Inc

MPC866PCZP100A bảng dữ liệu(HTML) 13 Page - Freescale Semiconductor, Inc

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MPC866/MPC859 Hardware Specifications, Rev. 2
Freescale Semiconductor
13
Thermal Calculation and Measurement
Figure 3. Effect of Board Temperature Rise on Thermal Behavior
If the board temperature is known, an estimate of the junction temperature in the environment can be made using
the following equation:
TJ = TB +(RθJB x PD)
where:
RθJB = junction-to-board thermal resistance (ºC/W)
TB = board temperature ºC
PD = power dissipation in package
If the board temperature is known and the heat loss from the package case to the air can be ignored, acceptable
predictions of junction temperature can be made. For this method to work, the board and board mounting must be
similar to the test board used to determine the junction-to-board thermal resistance, namely a 2s2p (board with a
power and a ground plane) and vias attaching the thermal balls to the ground plane.
7.4
Estimation Using Simulation
When the board temperature is not known, a thermal simulation of the application is needed. The simple two-resistor
model can be used with the thermal simulation of the application [2], or a more accurate and complex model of the
package can be used in the thermal simulation.



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