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SI5435BDC Arkusz danych(PDF) 8 Page - Vishay Siliconix

Numer części SI5435BDC
Szczegółowy opis  P-Channel 30-V (D-S) MOSFET
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SI5435BDC Arkusz danych(HTML) 8 Page - Vishay Siliconix

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AN811
Vishay Siliconix
www.vishay.com
2
Document Number: 71126
12-Dec-03
Front of Board
FIGURE 3.
Back of Board
vishay.com
ChipFETr
THERMAL PERFORMANCE
Junction-to-Foot Thermal Resistance
(the Package Performance)
Thermal performance for the 1206-8 ChipFET measured as
junction-to-foot thermal resistance is 15_C/W typical, 20_C/W
maximum for the single device. The “foot” is the drain lead of
the device as it connects with the body. This is identical to the
SO-8 package RQjf performance, a feat made possible by
shortening the leads to the point where they become only a
small part of the total footprint area.
Junction-to-Ambient Thermal Resistance
(dependent on pcb size)
The typical RQja for the single-channel 1206-8 ChipFET is
80_C/W steady state, compared with 68_C/W for the SO-8.
Maximum ratings are 95_C/W for the 1206-8 versus 80_C/W
for the SO-8.
Testing
To aid comparison further, Figure 4 illustrates ChipFET 1206-8
thermal performance on two different board sizes and three
different pad patterns. The results display the thermal
performance out to steady state and produce a graphic
account of how an increased copper pad area for the drain
connections can enhance thermal performance. The
measured steady state values of RQja for the single 1206-8
ChipFET are :
1) Minimum recommended pad pattern (see
Figure 2) on the evaluation board size of
0.5 in x 0.6 in.
156_C/W
2) The evaluation board with the pad pattern
described on Figure 3.
111_C/W
3) Industry standard 1” square pcb with
maximum copper both sides.
78_C/W
The results show that a major reduction can be made in the
thermal resistance by increasing the copper drain area. In this
example, a 45_C/W reduction was achieved without having to
increase the size of the board. If increasing board size is an
option, a further 33_C/W reduction was obtained by
maximizing the copper from the drain on the larger 1” square
pcb.
Time (Secs)
FIGURE 4. Single 1206−8 ChipFET
0
1
160
40
80
100
1000
120
10
10-1
10-2
10-3
10-4
10-5
1” Square PCB
Single EVB
Min. Footprint
SUMMARY
The thermal results for the single-channel 1206-8 ChipFET
package display similar power dissipation performance to the
SO-8 with a footprint reduction of 80%. Careful design of the
package has allowed for this performance to be achieved. The
short leads allow the die size to be maximized and thermal
resistance to be reduced within the confines of the TSOP-6
body size.
ASSOCIATED DOCUMENT
1206-8 ChipFET Dual Thermal performance, AN812
(http://www.vishay.com/doc?71127).


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