參數(shù)資料
型號: MC8641DTHX1250HE
廠商: Freescale Semiconductor
文件頁數(shù): 20/130頁
文件大?。?/td> 0K
描述: IC DUAL CORE PROCESSOR 1023-CBGA
標準包裝: 1
系列: MPC86xx
處理器類型: 32-位 MPC86xx PowerPC
速度: 1.25GHz
電壓: 1.05V
安裝類型: 表面貼裝
封裝/外殼: 1023-BCBGA,F(xiàn)CCBGA
供應商設備封裝: 1023-FCCBGA(33x33)
包裝: 托盤
MPC8641 and MPC8641D Integrated Host Processor Hardware Specifications, Rev. 2
116
Freescale Semiconductor
Thermal
Ideality factor is defined as the deviation from the ideal diode equation:
Another useful equation is:
Where:
Ifw = Forward current
Is = Saturation current
Vd = Voltage at diode
Vf = Voltage forward biased
VH = Diode voltage while IH is flowing
VL = Diode voltage while IL is flowing
IH = Larger diode bias current
IL = Smaller diode bias current
q = Charge of electron (1.6 x 10 –19 C)
n = Ideality factor (normally 1.0)
K = Boltzman’s constant (1.38 x 10–23 Joules/K)
T = Temperature (Kelvins)
The ratio of IH to IL is usually selected to be 10:1. The above simplifies to the following:
Solving for T, the equation becomes:
Ifw = Is e
– 1
qVf
___
nKT
VH – VL = n
ln
KT
__
q
IH
__
IL
VH – VL = 1.986 × 10
–4 × nT
nT =
VH – VL
__________
1.986
× 10–4
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