參數(shù)資料
型號(hào): MSK171
廠商: MS KENNEDY CORP
元件分類: 運(yùn)動(dòng)控制電子
英文描述: High Power Dual Operational Amplifier(高電壓高輸出電流低失真雙運(yùn)算放大器)
中文描述: DUAL OP-AMP, 10000 uV OFFSET-MAX, CDIP8
封裝: POWER, DIP-8
文件頁(yè)數(shù): 4/6頁(yè)
文件大?。?/td> 364K
代理商: MSK171
APPLICATION NOTES CONTINUED
HEAT SINKING
To determine if a heat sink is necessary for your appli-
cation and if so, what type, refer to the thermal model
and governing equation below.
Thermal
Model:
T
J
=P
D
x (R
θ
JC
+ R
θ
CS
+ R
θ
SA
) + T
A
Where
T
J
= Junction Temperature
P
D
= Total Power Dissipation
R
θ
JC
= Junction to Case Thermal Resistance
R
θ
CS
= Case to Heat Sink Thermal Resistance
R
θ
SA
= Heat Sink to Ambient Thermal Resistance
T
C
= Case Temperature
T
A
= Ambient Temperature
T
S
= Sink Temperature
Governing Equation:
1.) Find Driver Power Dissipation
P
D
= [(quiescent current) x (+V
CC
- (-V
CC
))] +
[(V
CC
-V
O
) x I
OUT
]
= (75mA) x (40V) + (10V) x (0.5A) + (10V) x (0.5A)
= 3W + 10W
= 13W
2.) For conservative design, set T
J
=+150°C.
3.) For this example, worst case T
A
=+25°C
4.) R
θ
JC
= 4.0°C/W typically
5.) R
θ
CS
= 0.15°C/W for most thermal greases
6.) Rearrange governing equation to solve for R
θ
SA
R
θ
SA
= ((T
J
- T
A
)/P
D
) - (R
θ
JC
) - (R
θ
CS
)
= ((150°C - 25°C) / 13W) - (4°C/W) - (.15°C/W)
5.5°C/W
The heat sink in this example must have a thermal
resistance of no more than 5.5°C/W to maintain a junc-
tion temperature of no more than +150°C
.
Example:
In our example the amplifier application requires each
output to drive a 10 volt peak sine wave across a 20
ohm load for 0.5 amp of output current. For a worst
case analysis we will treat the 0.5 amp peak output cur-
rent as a D.C. output current. The power supplies are
±20VDC.
Thermal Path:
Rev. C 8/00
4
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