MC7805CT datasheet(21/32 Pages) ONSEMI

Part #	MC7805CT

Description	1.0 A Positive Voltage Regulators

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MC7800, MC7800A, NCV7805

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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

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

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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