ISL59530_11 Datasheet, PDF (24/26 Pages) Intersil Corporation – 16x16 Video Crosspoint

ISL59530
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:
n
∑ ^PDMAX ^{= V}S ^{× I}SMAX ⁺
(
V_S
–
V_O
U
T
i
)
×
V_{-----O----U----T----i}
R_Li
i=1
(EQ. 2)
Where:
• V_S = Supply voltage = 5V
• I_SMAX = Maximum quiescent supply current = 360mA
• V_OUT = Maximum output voltage of the application = 2V
• R_LOAD = Load resistance tied to ground = 150
• n = 1 to 16 channels
n
∑ ^{P D}M A X
=
V_S × I_SMAX +
(
V_S
–
V_O
U
T
i
)
×
V_{-----O----U----T----i}
R_Li
=
i=1
2.44 W
(EQ. 3)
The required θ_JA to dissipate 2.44W is:
Θ_JA
=
T_{----J---M-----A----X-----–-----}T_{----A---M-----A----X--}
PD_MAX
=
16.4 ( ° C /W )
(EQ. 4)
Table 8 shows θ_JA thermal resistance results with a
Wakefield heatsink and without heatsink and various airflow.
As the thermal resistance 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
16.0
7.0
6.0
4.7
658-25AB
Heatsink
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24
FN6220.8
April 13, 2011