參數(shù)資料
型號(hào): MPC859PVR133A
廠商: Freescale Semiconductor
文件頁(yè)數(shù): 5/96頁(yè)
文件大?。?/td> 0K
描述: IC MPU POWERQUICC 133MHZ 357PBGA
標(biāo)準(zhǔn)包裝: 44
系列: MPC8xx
處理器類(lèi)型: 32-位 MPC8xx PowerQUICC
速度: 133MHz
電壓: 1.8V
安裝類(lèi)型: 表面貼裝
封裝/外殼: 357-BBGA
供應(yīng)商設(shè)備封裝: 357-PBGA(25x25)
包裝: 托盤(pán)
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 (C/W)
TB = board temperature C
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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