參數(shù)資料
型號(hào): ISL59532
廠商: Intersil Corporation
英文描述: 32x32 Video Crosspoint(32x32視頻矩陣開(kāi)關(guān))
中文描述: 32x32視頻交叉點(diǎn)(32x32視頻矩陣開(kāi)關(guān))
文件頁(yè)數(shù): 23/24頁(yè)
文件大?。?/td> 1305K
代理商: ISL59532
23
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FN7432.3
July 24, 2006
Where:
T
JMAX
= Maximum junction temperature = 125
°
C
T
AMAX
= Maximum ambient temperature = 85
°
C
θ
JA
= Thermal resistance of the package
The maximum power dissipation actually produced by an IC
is the total quiescent supply current times the total power
supply voltage, plus the power in the IC due to the load, or:
Where:
V
S
= Supply voltage = 5V
I
SMAX
= Maximum quiescent supply current = 700mA
V
OUT
= Maximum output voltage of the application = 2V
R
LOAD
= Load resistance tied to ground = 150
n = 1 to 32 channels
The required
θ
JA
to dissipate 4.8W is:
Table 8 shows
θ
JA
thermal resistance results with a
Wakefield heatsink and without heatsink and various airflow.
At the thermal resistance equation shows, the required
thermal resistance depends on the maximum ambient
temperature.
TABLE 8.
θ
JA
THERMAL RESISTANCE [
°
C/W]
Airflow [LFM]
0
250
500
750
No Heatsink
18
14.3
13.0
12.6
Wakefield
658-25AB
Heatsink
16.0
7.0
6.0
4.7
PD
MAX
V
S
I
SMAX
V
S
V
OUTi
(
)
i
1
=
n
V
Li
-----------------
×
+
×
=
PD
MAX
V
S
I
SMAX
V
S
V
OUTi
(
)
i
1
=
n
V
Li
-----------------
×
+
×
4.8W
=
=
Θ
JA
T
--------------------------------------------
T
MAX
8.33
°
C/W
(
)
=
=
ISL59532
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