MC7818BTG Просмотр технического описания (PDF) - ON Semiconductor
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MC7818BTG Datasheet PDF : 34 Pages
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MC7800, MC7800A, MC7800AE, NCV7800
20
qJC = 5°C/W
16
qHS = 0°C/W
qJA = 65°C/W
TJ(max) = 150°C
12
qHS = 5°C/W
8.0
qHS = 15°C/W
4.0
No Heatsink
0
-50 -25
0 25 50 75 100 125 150
TA, AMBIENT TEMPERATURE (°C)
Figure 13. Worst Case Power Dissipation versus
Ambient Temperature (Case 221A)
2.5
IO = 1.0 A
IO = 500 mA
2.0
IO = 200 mA
1.5 IO = 20 mA
1.0 IO = 0 mA
0.5
DVO = 2% of VO
- - - Extended Curve for MC78XXB
0
-75 -50 -25 0 25 50 75 100 125
TJ, JUNCTION TEMPERATURE (°C)
Figure 14. Input Output Differential as a Function
of Junction Temperature (MC78XXC, AC, B)
80
3.5
70
Free Air
PD(max) for TA = 50°C
3.0
Mounted
Vertically
60
50
Minimum
Size Pad
40
RqJA
2.0 oz. Copper 2.5
L
ÎÎÎÎ2.0
ÎÎÎÎ L
ÎÎÎÎÎÎÎÎ1.5
30
1.0
0
5.0
10
15
20
25
30
L, LENGTH OF COPPER (mm)
Figure 15. D2PAK Thermal Resistance and Maximum
Power Dissipation versus P.C.B. Copper Length
100
Free Air
90
Mounted
Vertically
80
Minimum
70
Size Pad
60
2.4
PD(max) for TA = 50°C
2.0
2.0 oz. Copper
L
1.6
ÎÎÎÎÎÎÎÎ L
1.2
ÎÎÎÎ0.8
50
40
0
5.0
10
RqJA
15
20
0.4
0
25
30
L, LENGTH OF COPPER (mm)
Figure 16. DPAK Thermal Resistance and Maximum
Power Dissipation versus P.C.B. Copper Length
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22
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