MC78M00 MC78M00A Series
DEFINITIONS
Line Regulation – The change in output voltage for a
Input Bias Current – That part of the input current that is
change in the input voltage. The measurement is made under
conditions of low dissipation or by using pulse techniques
such that the average chip temperature is not significantly
affected.
not delivered to the load.
Output Noise Voltage – The rms AC voltage at the
output, with constant load and no input ripple, measured over
a specified frequency range.
Load Regulation – The change in output voltage for a
change in load current at constant chip temperature.
Long Term Stability – Output voltage stability under
accelerated life test conditions with the maximum rated
voltage listed in the devices’ electrical characteristics and
maximum power dissipation.
Maximum Power Dissipation – The maximum total
device dissipation for which the regulator will operate within
specifications.
Figure 1. DPAK Thermal Resistance and Maximum
Power Dissipation versus P.C.B. Copper Length
2.4
2.0
1.6
1.2
0.8
0.4
0
100
P
for T = 50
A
°
C
D(max)
Free Air
Mounted
Vertically
90
2.0 oz. Copper
L
80
70
60
50
40
Minimum
Size Pad
L
R
θ
JA
0
5.0
10
15
20
25
30
L, LENGTH OF COPPER (mm)
Figure 2. Worst Case Power Dissipation
versus Ambient Temperature (TO–220)
10
Infinite Heat
Sink
θ
= 10°C/W
HS
5.0
θ
= 20°C/W
3.0
2.0
HS
No Heat Sink
1.0
0.5
0.3
0.2
θ
P
= 5°C/W
JC
= 7.52 W
D(max)
0.1
25
50
75
100
125
150
T , AMBIENT TEMPERATURE (°C)
A
7
MOTOROLA ANALOG IC DEVICE DATA
MOTOROLA [ MOTOROLA ]
