mpc8640 Freescale Semiconductor, Inc, mpc8640 Datasheet - Page 115
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mpc8640
Manufacturer Part Number
mpc8640
Description
Integrated Host Processor
Manufacturer
Freescale Semiconductor, Inc
Datasheet
1.MPC8640.pdf
(130 pages)
- Current page: 115 of 130
- Download datasheet (2Mb)
Ideality factor is defined as the deviation from the ideal diode equation:
Another useful equation is:
Where:
The ratio of I
Solving for T, the equation becomes:
Freescale Semiconductor
V
V
nT =
I
I
V
V
V
V
I
I
q = Charge of electron (1.6 x 10
n = Ideality factor (normally 1.0)
K = Boltzman’s constant (1.38 x 10
T = Temperature (Kelvins)
H
H
fw
s
H
L
d
f
H
L
– V
I
fw
– V
= Forward current
= Saturation current
= Voltage at diode
= Voltage forward biased
= Diode voltage while I
= Diode voltage while I
= Larger diode bias current
= Smaller diode bias current
L
= I
= 1.986 × 10
L
H
__________
1.986 × 10
= n
MPC8640 and MPC8640D Integrated Host Processor Hardware Specifications, Rev. 3
s
to I
V
H
L
e
KT
__
– V
q
is usually selected to be 10:1. The above simplifies to the following:
___
nKT
qV
L
ln
f
–4
–4
__
– 1
I
× nT
I
L
H
H
L
is flowing
is flowing
–19
–23
C)
Joules/K)
Thermal
115
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