NCV7708 ON Semiconductor, NCV7708 Datasheet - Page 15

• Manufacturer Part Number: NCV7708
• Description: The NCV7708 is a fully protected Hex Half Bridge Driver designed specifically for automotive and industrial motion control applications. The six low and high side drivers are freely configurable and can be controlled separately. This allows for high
• Manufacturer: ON Semiconductor

and may be divided between nodes to separate thermal
behavior due to one portion of the network from another.
The Foster networks, though when sorted by time constant
(as above) bear a rough correlation with the Cauer networks,
are really only convenient mathematical models. Both
Foster and Cauer networks can be easily implemented using
The Cauer networks generally have physical significance
Figure 12. Non−Grounded Capacitor Thermal Ladder (“Foster” Ladder)
Time constants are not simple RC products. Amplitudes
of mathematical solution are not the resistance values.
Each rung is exactly characterized by its RC−product
time constant; amplitudes are the resistances.
Figure 11. Grounded Capacitor Thermal Network (“Cauer” Ladder)
Junction
Junction
C
C
1
1
R
R
1
1
C
C
2
2
R
R
2
2
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NCV7708
C
C
3
3
R
R
15
3
3
circuit simulating tools, whereas Foster networks may be
more easily implemented using mathematical tools (for
instance, in a spreadsheet program), according to the
following formula:
(thermal ground)
(thermal ground)
Ambient
Ambient
R(t) +
C
C
n
n
R
R
i+1
n
n
n
R i 1 * e
*t tau i