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參數(shù)資料
| 型號(hào)： | CS8371ETVA7 |
| 廠商： | ZF Electronics Corporation |
| 英文描述： | 8V/1A, 5V/250mA Dual Regulator with Independent Output Enables and NoCap |
| 中文描述： | 8V/1A，5V/250mA穩(wěn)壓器，帶有獨(dú)立的雙輸出啟用和NoCap |
| 文件頁(yè)數(shù)： | 7/8頁(yè) |
| 文件大?。?/td> | 174K |
| 代理商： | CS8371ETVA7 |
7
Applications Notes: continued
C
Calculating Power Dissipation
in a Dual Output Linear Regulator
The maximum power dissipation for a dual output regu-
lator (Figure 1) is
P
D(max)
= {V
IN(max)
D V
OUT1(min)
}I
OUT1(max)
+
{V
IN(max)
D V
OUT2(min)
}I
OUT2(max)
+ V
IN(max)
I
Q
, (1)
where
V
IN(max)
is the maximum input voltage,
V
OUT1(min)
is the minimum output voltage from V
OUT1
,
V
OUT2(min)
is the minimum output voltage from V
OUT2
,
I
OUT1(max)
is the maximum output current, for the appli-
cation,
I
OUT2(max)
is the maximum output current, for the appli-
cation,
I
Q
is the quiescent current the regulator consumes at
I
OUT(max)
.
Once the value of P
D(max)
is known, the maximum permis-
sible value of R
Q
JA
can be calculated:
R
Q
JA
=
(2)
The value of R
Q
JA
can then be compared with those in
the package section of the data sheet. Those packages
with R
Q
JA
's less than the calculated value in equation 2
will keep the die temperature below 150C.
In some cases, none of the packages will be sufficient to
dissipate the heat generated by the IC, and an external
heatsink will be required.
Heatsinks
A heatsink effectively increases the surface area of the
package to improve the flow of heat away from the IC and
into the surrounding air.
Each material in the heat flow path between the IC and the
outside environment will have a thermal resistance. Like
series electrical resistances, these resistances are summed
to determine the value of R
Q
JA
:
R
Q
JA
= R
Q
JC
+ R
Q
CS
+ R
Q
SA
,
(3)
where
R
Q
JC
= the junctionDtoDcase thermal resistance,
R
Q
CS
= the caseDtoDheatsink thermal resistance, and
R
Q
SA
= the heatsinkDtoDambient thermal resistance.
R
Q
JC
appears in the package section of the data sheet. Like
R
Q
JA
, it too is a function of package type. R
Q
CS
and R
Q
SA
are functions of the package type, heatsink and the inter-
face between them. These values appear in heatsink data
sheets of heatsink manufacturers.
150C - T
A
P
D
V
IN
V
OUT
2
I
IN
I
Q
Control
Features
}
I
OUT
2
V
OUT
1
I
OUT
1
Smart
Regulator
Figure 1: Dual output regulator with key performance parameters
labeled.
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