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MC7812CT Datasheet(PDF) 21 Page - ON Semiconductor

Part No. MC7812CT
Description  1.0 A Positive Voltage Regulators
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Maker  ONSEMI [ON Semiconductor]
Homepage  http://www.onsemi.com
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MC7800, MC7800A, NCV7805
http://onsemi.com
21
Figure 12. Worst Case Power Dissipation versus
Ambient Temperature (Case 221A)
Figure 13. Input Output Differential as a Function
of Junction Temperature (MC78XXC, AC, B)
20
16
12
8.0
4.0
0
−50
−25
0
25
50
75
100
125
150
TA, AMBIENT TEMPERATURE (°C)
qHS = 0°C/W
0.5
0
−75
−50
−25
0
25
50
75
100
125
TJ, JUNCTION TEMPERATURE (°C)
IO = 0 mA
IO = 20 mA
IO = 1.0 A
IO = 500 mA
IO = 200 mA
DVO = 2% of VO
− − − Extended Curve for MC78XXB
qJC = 5°C/W
qJA = 65°C/W
TJ(max) = 150°C
qHS = 5°C/W
qHS = 15°C/W
No Heatsink
2.0
1.5
1.0
2.5
Figure 14. D2PAK Thermal Resistance and Maximum
Power Dissipation versus P.C.B. Copper Length
30
40
50
60
70
80
1.0
1.5
2.0
2.5
3.0
3.5
0
102030
25
15
5.0
L, LENGTH OF COPPER (mm)
PD(max) for TA = 50°C
Minimum
Size Pad
2.0 oz. Copper
L
L
Free Air
Mounted
Vertically
RqJA
40
50
60
70
80
90
100
0
0.4
0.8
1.2
1.6
2.0
2.4
010
20
30
25
15
5.0
L, LENGTH OF COPPER (mm)
PD(max) for TA = 50°C
Minimum
Size Pad
L
L
Free Air
Mounted
Vertically
RqJA
2.0 oz. Copper
Figure 15. DPAK Thermal Resistance and Maximum
Power Dissipation versus P.C.B. Copper Length




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