NCV8141 ON Semiconductor, NCV8141 Datasheet - Page 12

• Manufacturer Part Number: NCV8141
• Description: 5v, 500ma Linear Regulator With Enable, /reset, And Watchdog
• Manufacturer: ON Semiconductor

permissible value of R
package section of the data sheet. Those packages with
R
the die temperature below 150°C.
qJA
I
V
Once the value of P
The value of R
Q
IN
I
's less than the calculated value in Equation 2 will keep
is the quiescent current the regulator consumes at
OUT(max)
Figure 15. Single Output Regulator With Key
Performance Parameters Labeled
I
IN
.
qJA
R qJA +
can then be compared with those in the
REGULATOR
qJA
D(max)
SMART
Control
Features
can be calculated:
150°C * T A
P D
I
is known, the maximum
Q
®
I
OUT
http://onsemi.com
V
OUT
NCV8141
(2)
12
dissipate the heat generated by the IC, and an external
heatsink will be required.
package to improve the flow of heat away from the IC and
into the surrounding air.
outside environment will have a thermal resistance. Like
series electrical resistances, these resistances are summed to
determine the value of R
where:
R
functions of the package type, heatsink and the interface
between them. These values appear in heatsink data sheets
of heatsink manufacturers.
qJA
In some cases, none of the packages will be sufficient to
A heatsink effectively increases the surface area of the
Each material in the heat flow path between the IC and the
R
R
R
R
qJC
qCS
qSA
qJC
, it too is a function of package type. R
= the junction-to-case thermal resistance,
appears in the package section of the data sheet. Like
= the case-to-heatsink thermal resistance, and
= the heatsink-to-ambient thermal resistance.
R qJA + R qJC ) R qCS ) R qSA
HEATSINKS
qJA
.
qCS
and R
qSA
are
(3)