NCV8506 ON Semiconductor, NCV8506 Datasheet - Page 10

• Manufacturer Part Number: NCV8506
• Description: Micropower 400 mA LDO Linear Regulators
• Manufacturer: ON Semiconductor

should work for most applications, however it is not
necessarily the optimized solution.
regulator (Figure 16) is:
P D(max) + [V IN(max) * V OUT(min) ] I OUT(max)
where:
permissible value of R
V
**C
IN
*C
0.1 mF
temperature expected.
The value for the output capacitor C
The maximum power dissipation for a single output
V
V
I
application, and
I
I
Once the value of P
C
filter.
OUT(max)
Q
OUT(max)
OUT
Figure 15. Test and Application Circuit Showing
IN
IN
IN(max)
OUT(min)
CALCULATING POWER DISSIPATION IN A
*
is the quiescent current the regulator consumes at
required if regulator is located far from the power supply
SINGLE OUTPUT LINEAR REGULATOR
required for stability. Capacitor must operate at minimum
is the maximum input voltage,
.
) V IN(max) I Q
is the minimum output voltage,
is the maximum output current for the
Output Compensation
R qJA + 150°C *
NCV8506
qJA
D(max)
RESET
can be calculated:
V
OUT
P D
is known, the maximum
OUT
T A
R
RST
shown in Figure 15
33 mF
C
http://onsemi.com
OUT
**
(1)
(2)
10
package section of the data sheet. Those packages with
R
the die temperature below 150°C.
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 heat sink data sheets
of heat sink manufacturers.
qJA
qJA
The value of R
In some cases, none of the packages will be sufficient to
A heat sink 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
’s less than the calculated value in equation 2 will keep
, it too is a function of package type. R
V
Figure 16. Single Output Regulator with Key
IN
= 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.
Performance Parameters Labeled
R qJA + R qJC ) R qCS ) R qSA
I
IN
qJA
can then be compared with those in the
HEAT SINKS
REGULATOR®
qJA
}
SMART
Control
Features
:
I
Q
qCS
I
OUT
and R
qSA
V
OUT
are
(3)