参数资料
型号: 18448
英文描述: Microprocessor Family CPU Thermal Management Application Note? 126KB (PDF)
中文描述: 微处理器系列CPU散热管理应用笔记? 126KB(PDF格式)
文件页数: 7/10页
文件大小: 126K
代理商: 18448
AMD
6
CPU Thermal Management
through the layers to the case of the device. Figure 9
shows the transient response to a single heat pulse and
a series of pulses to the die.
The junction temperature of a semiconductor device
is related to the temperatures of the various other
elements surrounding it by mathematical relation-
ships similar to those that define the properties of an
electrical circuit that contains resistance and capac-
itance. It is convenient, therefore, to show the thermal
characteristics of a solid state device as analogous
to the electrical properties of a circuit.
The flow of heat is analogous to the flow of charge;
thermal resistance and capacitance are analogous to
electrical resistance and capacitance; and the potential
difference (voltage) between two points in an electrical
circuit is analogous to temperature difference. Table 2
shows these relationships.
Table 2. Comparison of Electrical Parameters to
Analogous Thermal Parameters
Table 3. Comparison of Electrical Parameters to
Analogous Thermal Parameter
Cooling curve
Heating curve
120
130
140
150
160
170
Steady State Response
Time (seconds)
0
0.01
0.02
0.03
0.04
0.05
Te
mp
era
ture
(
°C)
a. 20-ms Heat Pulse
T
rans
ie
nt
Powe
r
In
pu
t
0
50
100
150
200
Steady State Response
Time (seconds)
0
0.05
0.1
0.15
0.2
0.25
T
e
m
p
er
a
tur
e
(
°C
)
b. 9-ms Square Pulse with a 12-ms period
Tran
si
ent
Po
wer
Inpu
t
Figure 9. Transient Responses
Electrical
Resistance
R(Ohms)
Capacitance
C
Amps-s/V
Voltage
VVolts
Current
IAmps
Conductivity
pOhms/cm2
Charge
q
Coulomb
Thermal
Thermal resistance
q
°C/W
Thermal capacitance
C
W-s/°C
Temp. difference
T°C
Power dissipation
PWatts
Thermal conductivity
K
W/in-°C
Quantity of heat
Q
Calories
Electrical
Resistance
R(Ohms)
Capacitance
C
Amps-s/V
Voltage
VVolts
Current
IAmps
Conductivity
pOhms/cm2
Charge
q
Coulomb
Thermal
Thermal resistance
q°C/W
Thermal capacitance
C
W-s/°C
Temp. difference
T°C
Power dissipation
PWatts
Thermal conductivity
K
W/in-°C
Quantity of heat
Q
Calories
R2
V1
V2
P
---------------------
=
θ2
T1
T2
P
--------------------
=
R2
V1
V2
P
---------------------
=
θ2
T1
T2
P
--------------------
=
APPENDIX
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