HIP0081AS1 Intersil, HIP0081AS1 Datasheet - Page 10

• Manufacturer Part Number: HIP0081AS1
• Manufacturer: Intersil

Specifications of HIP0081AS1

• Lead Free Status / RoHS Status: Supplier Unconfirmed

The Junction-to-Ambient equivalent to Equation 3, 3A is:
or:
Not all Integrated Circuit packages have a directly definable
case temperature because the heat is spread through the
lead frame to a PC Board which is the effective heat sink.
Calculation Example 1
For the HIP0081,
temperature, as an application design solution, should not
exceed 150
determines the dissipation, P
Assume the package is mounted to a heat sink having a
thermal resistance of 6
assume the dissipation is 3W and the ambient temperature
(T
for junction temperature (T
T
Calculation Example 2:
Assume for the HIP0080,
Board with good heat sinking characteristics. Again, the
worst case junction temperature, as an application design
solution, should not exceed 150
application, based on Equation 1, the dissipation,
P
and can be used to determine the maximum allowable
ambient temperature from Equation 5A as follows:
T
T
J
J
A
D
A
= 100
) is 100
=
= 1.5W. The maximum junction temperature is known
=
T
T
A
J
+
–
o
C + 3W x 9
P
P
o
D
D
C. From Equation 4,
o
C. For a given application, Equation 1
JA
JA
3.0
2.5
2.0
1.5
1.0
0.5
0.0
JC
50
o
FIGURE 6. HIP0081 MAXIMUM SINGLE OUTPUT CURRENT vs CASE (TAB) TEMPERATURE
= 3
C/W = 127
o
C/W and, for a given application,
o
C/W and the worst case junction
C
JA
) by Equation 3 is:
10
D
= 3
.
o
C. Assume from the
JA
o
o
C.
C/W mounted on a PC
is 9
(1)
(2)
o
C/W. The solution
THERMAL RESISTANCE,
75
CURVE (1): r
CURVE (2): r
CASE (HEAT SINK TAB) TEMPERATURE (
HIP0080, HIP0081
(EQ. 5A)
(EQ. 5)
DS(ON)
DS(ON)
= 1
= 0.5
MAX. +I
JC
100
= 3
T
Equal Current Loading Solution
Many 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
dissipation:
P
I
The 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
Given 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
Boundary conditions relate to the Absolute Maximum
Ratings as defined in the Data Sheet.
A
o
D
=
C/W
OUT(DC)
= 150
=
------------------------------------------------- -
m
m P
o
C - 1.5W x 30
1
JC
T
k
= I
J
=
–
2
o
T
r
..... = I
m I
DS ON
C)
C
125
2
m
, we have the following solution for
r
DS ON
o
C/W = 105
o
C
C.
.
150
(EQ. 6)
(EQ. 7)
C
.