HIP0080AM INTERSIL [Intersil Corporation], HIP0080AM Datasheet - Page 10

• Manufacturer Part Number: HIP0080AM
• Description: Quad Inverting Power Drivers with Serial Diagnostic Interface
• Manufacturer: INTERSIL [Intersil Corporation]

HIP0080, HIP0081The Junction-to-Ambient equivalent to
Equation 3, 3A is:
HIP0080, HIP0081or:
HIP0080, HIP0081Not all Integrated Circuit packages have
a directly definable case temperature because the heat is
spread thru the lead frame to a PC Board which is the
effective heat sink.
Calculation Example 1
HIP0080, HIP0081For the HIP0081,
worst case junction temperature, as an application design
solution, should not exceed 150
Equation 1 determines the dissipation, P
HIP0080, HIP0081Assume the package is mounted to a
heat sink having a thermal resistance of 6
given application, assume the dissipation is 3W and the
ambient temperature (T
9
Equation 3 is:
HIP0080, HIP0081T
Calculation Example 2:
HIP0080, HIP0081Assume for the HIP0080,
mounted on a PC Board with good heat sinking
characteristics. Again, the worst case junction temperature,
as an application design solution, should not exceed
150
the dissipation, P
T
T
o
J
A
C/W. The solution for junction temperature (T
=
=
o
C. Assume from the application, based on Equation 1,
T
T
A
J
+
–
P
P
D
D
JA
JA
D
= 1.5W. The maximum junction
J
3.0
2.5
2.0
1.5
1.0
0.5
0.0
FIGURE 6. HIP0081 MAXIMUM SINGLE OUTPUT CURRENT vs CASE (TAB) TEMPERATURE
= 100
A
50
) is 100
o
10
C + 3W x 9
o
o
C. For a given application,
C. From Equation 4,
JC
(1)
(2)
o
= 3
D
C/W = 127
o
.
C/W and, for a
o
C/W and the
THERMAL RESISTANCE,
75
JA
CURVE (1): r
CURVE (2): r
C
) by
= 3
CASE (HEAT SINK TAB) TEMPERATURE (
HIP0080, HIP0081
o
(EQ. 5A)
C.
(EQ. 5)
o
JA
C/W
DS(ON)
DS(ON)
is
= 1
= 0.5
MAX. +I
JC
100
temperature is known and can be used to determine the
maximum allowable ambient temperature from Equation 5A
as follows:
HIP0080, HIP0081T
Equal Current Loading Solution
HIP0080, HIP0081Many applications may have equal
current loading in the output drivers with equal saturated
turn ON and temperature conditions. As such, a convenient
method to show rating boundaries is to substitute the
dissipation Equation 2 into the junction temperature
Equation 3. For m outputs that are ON and conducting with
equal currents, where I = I
following solution for dissipation:
P
I
HIP0080, HIP0081The number of output drivers ON and
conducting (m) may be from 1 to n. (i.e., For all four output
drivers of the HIP0081 ON, m = 4.) Maximum temperature,
dissipation and current ratings must be observed. For a
defined number of conducting Power MOS Output Drivers,
we can plot the results for m devices showing I vs T
HIP0080, HIP0081Given the HIP0081 as an example,
Figures 6 and Figure 7 illustrate the boundaries for
temperature and current. Figure 6 shows the maximum
current for a single output ON while Figure 7 shows the
maximum current for all four outputs ON with equal current
plotted versus Case Temperature, T
relate to the Absolute Maximum Ratings as defined in the
Data Sheet.
D
=
= 3
=
o
------------------------------------------------- -
m
C/W
OUT(DC)
m P
JC
T
k
J
=
–
T
r
m I
DS ON
C
o
C)
2
A
125
= 150
r
DS ON
1
= I
o
C - 1.5W x 30
2
..... = I
C
m
. Boundary conditions
, we have the
o
C/W = 105
150
C
(EQ. 6)
(EQ. 7)
.
o
C.