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| 型号： | MPC5553EVBISYS |
| 厂商： | Freescale Semiconductor |
| 文件页数： | 67/68页 |
| 文件大小： | 0K |
| 描述： | KIT EVAL ISYSTEMS MPC5553 |
| 标准包装： | 1 |
| 类型： | 微控制器 |
| 适用于相关产品： | MPC5553 |
| 所含物品： | 评估板和演示软件 |
| 相关产品： | MPC5553MZQ132-ND - IC MCU MPC5553 REV A 324-PBGA MPC5553MZP132-ND - IC MCU MPC5553 REV A 416-PBGA |
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MPC5553 Microcontroller Data Sheet, Rev. 4
Electrical Characteristics
Freescale Semiconductor
8
At a known board temperature, the junction temperature is estimated using the following equation:
TJ = TB + (RJB PD)
where:
TJ = junction temperature (oC)
TB = board temperature at the package perimeter (oC/W)
RJB = junction-to-board thermal resistance (oC/W) per JESD51-8
PD = power dissipation in the package (W)
When the heat loss from the package case to the air does not factor into the calculation, an acceptable value
for the junction temperature is predictable. Ensure the application board is similar to the thermal test
condition, with the component soldered to a board with internal planes.
The thermal resistance is expressed as the sum of a junction-to-case thermal resistance plus a
case-to-ambient thermal resistance:
RJA = RJC + RCA
where:
RJA = junction-to-ambient thermal resistance (oC/W)
RJC = junction-to-case thermal resistance (oC/W)
RCA = case-to-ambient thermal resistance (oC/W)
RJC is device related and is not affected by other factors. The thermal environment can be controlled to
change the case-to-ambient thermal resistance, RCA. For example, change the air flow around the device,
add a heat sink, change the mounting arrangement on the printed circuit board, or change the thermal
dissipation on the printed circuit board surrounding the device. This description is most useful for
packages with heat sinks where 90% of the heat flow is through the case to heat sink to ambient.
For most packages, a better model is required.
A more accurate two-resistor thermal model can be constructed from the junction-to-board thermal
resistance and the junction-to-case thermal resistance. The junction-to-case thermal resistance describes
when using a heat sink or where a substantial amount of heat is dissipated from the top of the package. The
junction-to-board thermal resistance describes the thermal performance when most of the heat is
conducted to the printed circuit board. This model can be used to generate simple estimations and for
computational fluid dynamics (CFD) thermal models.
To determine the junction temperature of the device in the application on a prototype board, use the
thermal characterization parameter (
JT) to determine the junction temperature by measuring the
temperature at the top center of the package case using the following equation:
TJ = TT + (JT PD)
where:
TT = thermocouple temperature on top of the package (oC)
JT = thermal characterization parameter (oC/W)
PD = power dissipation in the package (W)
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