Data Sheet

MC7800, MC7800A, LM340, LM340A Series, NCV7805
http://onsemi.com
15
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)
, POWER DISSIPATION (W)
D
20
16
12
8.0
4.0
0
-50 -25 0 25 50 75 100 125 150
T
A
, AMBIENT TEMPERATURE (°C)
P
θ
HS
= 0°C/W
DIFFERENTIAL (V)
in out
, INPUT-OUTPUT VOLTAGE
0.5
0
-75 -50 -25 0 25 50 75 100 125
T
J
, JUNCTION TEMPERATURE (°C)
- VV
I
O
= 0 mA
I
O
= 20 mA
I
O
= 1.0 A
I
O
= 500 mA
I
O
= 200 mA
∆V
O
= 2% of V
O
- - - Extended Curve for MC78XXB
θ
JC
= 5°C/W
θ
JA
= 65°C/W
T
J(max)
= 150°C
θ
HS
= 5°C/W
θ
HS
= 15°C/W
No Heatsink
2.0
1.5
1.0
2.5
Figure 14. D
2
PAK Thermal Resistance and Maximum
Power Dissipation versus P.C.B. Copper Length
R , THERMAL RESISTANCE
JAθ
JUNCTIONTOAIR ( C/W)°
30
40
50
60
70
80
1.0
1.5
2.0
2.5
3.0
3.5
010203025155.0
L, LENGTH OF COPPER (mm)
P
D(max)
for T
A
= 50°C
Minimum
Size Pad
2.0 oz. Copper
L
L
Free Air
Mounted
Vertically
P
D
, MAXIMUM POWER DISSIPATION (W)
R
θ
JA
40
50
60
70
80
90
100
0
0.4
0.8
1.2
1.6
2.0
2.4
010203025155.0
L, LENGTH OF COPPER (mm)
P
D(max)
for T
A
= 50°C
Minimum
Size Pad
P
D
L
L
, MAXIMUM POWER DISSIPATION (W)
Free Air
Mounted
Vertically
R
θ
JA
2.0 oz. Copper
R , THERMAL RESISTANCE
JAθ
JUNCTION-TO-AIR ( C/W)°
Figure 15. DPAK Thermal Resistance and Maximum
Power Dissipation versus P.C.B. Copper Length