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CS8371ET7G датащи(PDF) 9 Page - ON Semiconductor

номер детали CS8371ET7G
подробное описание детали  8.0 V/1.0 A, 5.0 V/250 mA Dual Regulator with Independent Output Enables and NOCAP
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производитель  ONSEMI [ON Semiconductor]
домашняя страница  http://www.onsemi.com
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CS8371ET7G датащи(HTML) 9 Page - ON Semiconductor

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9
cause small signal oscillations at the output. This will
depend on the load conditions. With these types of loads, a
traditional output stage may be better suited for proper
operation.
Output 1 employs NOCAP. Refer to the plots in the Typical
Performance Characteristics section for appropriate output
capacitor selections for stability if an external capacitor is
required by the switching characteristics of the load. Output
2 has a Darlington NPN−type output structure and is
inherently stable with any type of capacitive load or no
capacitor at all.
Calculating Power Dissipation in a
Dual Output Linear Regulator
The maximum power dissipation for a dual output
regulator (Figure 24) is
PD(max) + VIN(max) * VOUT1(min) IOUT1(max) )
VIN(max) * VOUT2(min) IOUT2(max) ) VIN(max)IQ (1)
where:
VIN(max) is the maximum input voltage,
VOUT1(min) is the minimum output voltage from VOUT1,
VOUT2(min) is the minimum output voltage from VOUT2,
IOUT1(max) is the maximum output current, for the
application,
IOUT2(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 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
heatsink will be required.
Figure 24. Dual Output Regulator With Key
Performance Parameters Labeled.
SMART
REGULATOR
®
Control
Features
VOUT1
IOUT1
VOUT2
IOUT2
VIN
IIN
IQ
Heat Sinks
A heat sink 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 too 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 heat sink manufacturers.
PACKAGE THERMAL DATA
Parameter
TO−220
SEVEN LEAD
Unit
RqJC
Typical
2.4
°C/W
RqJA
Typical
50
°C/W


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