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CS8182 датащи(PDF) 7 Page - ON Semiconductor

номер детали CS8182
подробное описание детали  Micropower 200 mA Low Dropout Tracking Regulator/Line Driver
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производитель  ONSEMI [ON Semiconductor]
домашняя страница  http://www.onsemi.com
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CS8182 датащи(HTML) 7 Page - ON Semiconductor

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7
External Capacitors
The output capacitor for the CS8182 is required for
stability. Without it, the regulator output will oscillate.
Actual size and type may vary depending upon the
application load and temperature range. Capacitor effective
series resistance (ESR) is also a factor in the IC stability.
Worst−case is determined at the minimum ambient
temperature and maximum load expected.
The output capacitor can be increased in size to any
desired value above the minimum. One possible purpose of
this would be to maintain the output voltage during brief
conditions of negative input transients that might be
characteristic of a particular system.
The capacitor must also be rated at all ambient
temperatures expected in the system. To maintain regulator
stability down to −40
°C, a capacitor rated at that temperature
must be used.
Ceramic Capacitor Stability
The CS8182 has been verified to work with ceramic
output capacitors with an additional series resistor
simulating traditional ESR of tantalum capacitors; however,
it has been determined the best operational performance is
with a 330 m
W series resistor (or parallel combination of
three 1
W resistors) in conjunction with a 22 mF output
capacitor. Values outside of this are known to have limited
performance
with
respect
to
stability.
For
more
information, please contact your local ON Semiconductor
sales office.
Calculating Power Dissipation in a Single Output
Linear Regulator
The maximum power dissipation for a single output
regulator (Figure 17) is:
PD(max)
+ {VIN(max) * VOUT(min)} IOUT(max)
) VIN(max)IQ
(1)
where:
VIN(max) is the maximum input voltage,
VOUT(min) is the minimum output voltage,
IOUT(max) is the maximum output current, for the
application,and
IQ is the quiescent current the regulator consumes at
IOUT(max).
Once the value of PD(max) is known, the maximum
permissible value of RqJA can be calculated:
R
qJA +
150
° C * TA
PD
(2)
The value of RqJA can then be compared with those in the
package section of the data sheet. Those packages with
RqJA’s less than the calculated value in equation 2 will keep
the die temperature below 150
°C.
In some cases, none of the packages will be sufficient to
dissipate the heat generated by the IC, and an external heat
sink will be required.
Figure 17. Single Output Regulator with Key
Performance Parameters Labeled
IIN
IOUT
IQ
SMART
VOUT
VIN
REGULATOR®
Control
Features
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 RqJA:
R
qJA + RqJC ) RqCS ) RqSA
(3)
where:
RqJC = the junction−to−case thermal resistance,
RqCS = the case−to−heatsink thermal resistance, and
RqSA = the heatsink−to−ambient thermal resistance.
RqJC appears in the package section of the data sheet. Like
RqJA, it is a function of package type. RqCS and RqSA are
functions of the package type, heatsink and the interface
between them. These values appear in heat sink data sheets
of heatsink manufacturers.


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