参数资料
型号: MC8640DTHX1000HE
厂商: Freescale Semiconductor
文件页数: 19/130页
文件大小: 0K
描述: IC DUAL CORE PROCESSOR 1023-CBGA
标准包装: 1
系列: MPC86xx
处理器类型: 32-位 MPC86xx PowerPC
速度: 1.0GHz
电压: 1.05V
安装类型: 表面贴装
封装/外壳: 1023-BCBGA,FCCBGA
供应商设备封装: 1023-FCCBGA(33x33)
包装: 托盘
MPC8640 and MPC8640D Integrated Host Processor Hardware Specifications, Rev. 3
Freescale Semiconductor
115
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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