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SI7774DP Fiches technique(PDF) 11 Page - Vishay Siliconix

No de pièce SI7774DP
Description  N-Channel 30 V (D-S) MOSFET with Schottky Diode
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Site Internet  http://www.vishay.com
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SI7774DP Fiches technique(HTML) 11 Page - Vishay Siliconix

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Document Number 71622
28-Feb-06
Vishay Siliconix
AN821
SYSTEM AND ELECTRICAL IMPACT OF
PowerPAK SO-8
In any design, one must take into account the change in
MOSFET rDS(on) with temperature (Figure 7).
A MOSFET generates internal heat due to the current
passing through the channel. This self-heating raises
the junction temperature of the device above that of the
PC board to which it is mounted, causing increased
power dissipation in the device. A major source of this
problem lies in the large values of the junction-to-foot
thermal resistance of the SO-8 package.
PowerPAK SO-8 minimizes the junction-to-board ther-
mal resistance to where the MOSFET die temperature is
very close to the temperature of the PC board. Consider
two devices mounted on a PC board heated to 105 °C
by other components on the board (Figure 8).
Suppose each device is dissipating 2.7 W. Using the
junction-to-foot thermal resistance characteristics of the
PowerPAK SO-8 and the standard SO-8, the die tem-
perature is determined to be 107 °C for the PowerPAK
(and for DPAK) and 148 °C for the standard SO-8. This
is a 2 °C rise above the board temperature for the Pow-
erPAK and a 43 °C rise for the standard SO-8. Referring
to Figure 7, a 2 °C difference has minimal effect on
rDS(on) whereas a 43C difference has a significant effect
on rDS(on).
Minimizing the thermal rise above the board tempera-
ture by using PowerPAK has not only eased the thermal
design but it has allowed the device to run cooler, keep
rDS(on) low, and permits the device to handle more cur-
rent than the same MOSFET die in the standard SO-8
package.
CONCLUSIONS
PowerPAK SO-8 has been shown to have the same
thermal performance as the DPAK package while hav-
ing the same footprint as the standard SO-8 package.
The PowerPAK SO-8 can hold larger die approximately
equal in size to the maximum that the DPAK can accom-
modate implying no sacrifice in performance because of
package limitations.
Recommended PowerPAK SO-8 land patterns are pro-
vided to aid in PC board layout for designs using this
new package.
Thermal considerations have indicated that significant
advantages can be gained by using PowerPAK SO-8
devices in designs where the PC board was laid out for
the standard SO-8. Applications experimental data gave
thermal performance data showing minimum and typical
thermal performance in a SO-8 environment, plus infor-
mation on the optimum thermal performance obtainable
including spreading copper. This further emphasized the
DPAK equivalency.
PowerPAK SO-8 therefore has the desired small size
characteristics of the SO-8 combined with the attractive
thermal characteristics of the DPAK package.
Figure 7. MOSFET rDS(on) vs. Temperature
Figure 8. Temperature of Devices on a PC Board
0.6
0.8
1.0
1.2
1.4
1.6
1.8
- 50
- 25
0
25
50
75
100
125
150
VGS = 10 V
ID = 23 A
On-Resistance vs. Junction Temperature
TJ - Junction Temperature (°C)
0.8 °C/W
107 °C
PowerPAK SO-8
16 C/W
148 °C
Standard SO-8
PC Board at 105 °C


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