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參數資料
| 型號： | MC34059FTA |
| 廠商： | MOTOROLA INC |
| 元件分類： | 通用總線功能 |
| 英文描述： | HEX EIA-485 TRANSCEIVER with THREE-STATE OUTPUTS |
| 中文描述： | LINE TRANSCEIVER, PQFP48 |
| 封裝： | PLASTIC, TQFP-48 |
| 文件頁數： | 11/12頁 |
| 文件大小： | 237K |
| 代理商： | MC34059FTA |
MC34058 MC34059
11
MOTOROLA ANALOG IC DEVICE DATA
θ
jc for the package on this board is 25
±
20% depending on the location of
the package on the board.
Figure 13. Thermal Resistance (
θ
ja) for Board
with Large External Ground Plane
55
θ
j
AIR SPEED (LINEAR FT/MIN)
0
100
200
300
500
50
45
40
35
30
°
400
600
θ
j
°
* Masked radiators were covered by a solder mask. Exposed radiators
were bare copper.
Figure 14A. Thermal Resistance (
θ
ja) for
Board Without Ground Plane
120
AIR SPEED (LINEAR FT/MIN)
0
200
400
600
1000
100
80
60
50
110
90
70
800
1200
Exposed Radiators*
Masked Radiators*
No Radiators
Figure 14B. Layout Used for Thermal Resistance
Measurements in Figure 14A
8 (mm)
8 (mm)
Copper
Radiators
l (mm)
w (mm)
Copper
Radiators
l (mm)
w (mm)
Figure 15. Placement of Thermal Vias to Enhance
Heat Transfer to Ground Plane
Figure 14A on the other hand shows the result of a single
layer board without an internal ground plane. The graphs
show that even though there are radiators of substantial area
surrounding the package, substantial degredation of thermal
performance is evident (Figure 14B shows the layout used
for the measurements in Figure 14A). Comparing Figures 13
and 14A shows almost a 2:1 improvement for the strategy
involving the external ground plane.
It is clear from Figures 13, 14A and Example 1, that if an
application is to use all the device drivers, preparations to
assure adequate thermal performance of the system must
be taken.
If an extensive external ground plane is unavailable, and
only an internal ground plane is available, the thermal
performance of the device can still be improved by providing
thermal vias to connect the radiators to the internal ground
plane. Figure 15 shows a proposed scheme for thermal vias
(contact board manufactures for specifics about the thermal
performance of their products and possible enhancements).
The thermal resistance for this structure on 1.0 oz. Copper
connecting each of the four radiators to an internal ground
plane and provide an estimated thermal resistance of
approximately 5.0
°
C/W. The vias used in the estimate had
80 mil diameters, on 100 mil centers and a 1.0 mil copper
thickness.
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