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參數(shù)資料
| 型號(hào)： | ITF86182SK8T |
| 廠商： | INTERSIL CORP |
| 元件分類： | 功率晶體管 |
| 英文描述： | 11A, 30V, 0.0115 Ohm, P-Channel, Logic Level, Power MOSFET |
| 中文描述： | 30 V, 0.0175 ohm, P-CHANNEL, Si, POWER, MOSFET, MS-012AA |
| 封裝： | PLASTIC, SO-8 |
| 文件頁數(shù)： | 7/12頁 |
| 文件大小： | 174K |
| 代理商： | ITF86182SK8T |
7
Intersil provides thermal information to assist the designer’s
preliminary application evaluation. Figure 20 defines the
R
θ
JA
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 Intersil device Spice
thermal model or manually utilizing the normalized maximum
transient thermal impedance curve.
Displayed on the curve are R
θ
JA
values listed in the
Electrical Specifications table. The points were chosen to
depict the compromise between the copper board area, the
thermal resistance and ultimately the power dissipation,
P
DM
.
Thermal resistances corresponding to other copper areas
can be obtained from Figure 20 or by calculation using
Equation 2. R
θ
JA
is defined as the natural log of the area
times a coefficient added to a constant. The area, in square
inches is the top copper area including the gate and source
pads.
ln
×
–
=
The transient thermal impedance (Z
θ
JA
) is also effected by
varied top copper board area. Figure 21 shows the effect of
copper pad area on single pulse transient thermal
impedance. Each trace represents a copper pad area in
square inches corresponding to the descending list in the
graph. Spice and SABER thermal models are provided for
each of the listed pad areas.
Copper pad area has no perceivable effect on transient
thermal impedance for pulse widths less than 100ms. For
pulse widths less than 100ms the transient thermal
impedance is determined by the die and package. Therefore,
CTHERM1 through CTHERM5 and RTHERM1 through
RTHERM5 remain constant for each of the thermal models. A
listing of the model component values is available in Table 1.
(EQ. 2)
R
θ
JA
83.2
23.6
Area
(
)
FIGURE 20. THERMAL RESISTANCE vs MOUNTING PAD AREA
120
160
200
240
0.1
1.0
80
0.01
R
θ
JA
= 83.2 - 23.6*
ln
(AREA)
152
o
C/W - 0.054in
2
189
o
C/W - 0.0115in
2
R
θ
J
(
o
C
AREA, TOP COPPER AREA (in
2
)
FIGURE 21. THERMAL RESISTANCE vs MOUNTING PAD AREA
30
60
90
120
150
0
10
-1
10
0
10
1
10
2
10
3
t, RECTANGULAR PULSE DURATION (s)
Z
θ
J
,
COPPER BOARD AREA - DESCENDING ORDER
0.04 in
0.28 in
2
0.52 in
2
0.76 in
2
1.00 in
2
I
o
C
ITF86182SK8T
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