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FDD120AN15A0 데이터시트(PDF) 7 Page - Fairchild Semiconductor

부품명 FDD120AN15A0
상세설명  N-Channel PowerTrench MOSFET
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제조업체  FAIRCHILD [Fairchild Semiconductor]
홈페이지  http://www.fairchildsemi.com
Logo FAIRCHILD - Fairchild Semiconductor

FDD120AN15A0 데이터시트(HTML) 7 Page - Fairchild Semiconductor

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©2002 Fairchild Semiconductor Corporation
FDP120AN15A0 / FDD120AN15A0 Rev. B
Thermal Resistance vs. Mounting Pad Area
The maximum rated junction temperature, TJM, and the
thermal resistance of the heat dissipating path determines
the maximum allowable device power dissipation, PDM, in an
application.
Therefore
the
application’s
ambient
temperature, TA (
oC), and thermal resistance RθJA (oC/W)
must be reviewed to ensure that TJM is never exceeded.
Equation 1 mathematically represents the relationship and
serves as the basis for establishing the rating of the part.
In using surface mount devices such as the TO-252
package, the environment in which it is applied will have a
significant influence on the part’s current and maximum
power dissipation ratings. Precise determination of PDM is
complex and influenced by many factors:
1. Mounting pad area onto which the device is attached and
whether there is copper on one side or both sides of the
board.
2. The number of copper layers and the thickness of the
board.
3. The use of external heat sinks.
4. The use of thermal vias.
5. Air flow and board orientation.
6. For non steady state applications, the pulse width, the
duty cycle and the transient thermal response of the part,
the board and the environment they are in.
Fairchild
provides
thermal
information
to
assist
the
designer’s preliminary application evaluation. Figure 21
defines the RθJA for the device as a function of the top
copper (component side) area. This is for a horizontally
positioned FR-4 board with 1oz copper after 1000 seconds
of steady state power with no air flow. This graph provides
the necessary information for calculation of the steady state
junction
temperature
or
power
dissipation.
Pulse
applications can be evaluated using the Fairchild device
Spice thermal model or manually utilizing the normalized
maximum transient thermal impedance curve.
Thermal resistances corresponding to other copper areas
can be obtained from Figure 21 or by calculation using
Equation 2 or 3. Equation 2 is used for copper area defined
in inches square and equation 3 is for area in centimeters
square. The area, in square inches or square centimeters is
the top copper area including the gate and source pads.
(EQ. 1)
P
DM
T
JM
T
A
()
RθJA
-----------------------------
=
Area in Inches Squared
(EQ. 2)
RθJA
33.32
23.84
0.268
Area
+
()
-------------------------------------
+
=
(EQ. 3)
RθJA
33.32
154
1.73
Area
+
()
----------------------------------
+
=
Area in Centimeters Squared
25
50
75
100
125
0.01
0.1
1
10
Figure 21. Thermal Resistance vs Mounting
Pad Area
RθJA = 33.32+ 23.84/(0.268+Area) EQ.2
AREA, TOP COPPER AREA in2 (cm2)
RθJA = 33.32+ 154/(1.73+Area) EQ.3
(0.645)
(6.45)
(64.5)
(0.0645)


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