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CS8120YTVA5 데이터시트(PDF) 7 Page - Cherry Semiconductor Corporation

부품명 CS8120YTVA5
상세설명  5V, 300mA Linear Regulator with and ENABLE RESET
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제조업체  CHERRY [Cherry Semiconductor Corporation]
홈페이지  http://www.cherrycorp.com/
Logo CHERRY - Cherry Semiconductor Corporation

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7
The maximum power dissipation for a single output regu-
lator (Figure 7) is:
PD(max)={VIN(max) Ð 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 applica-
tion, and
IQ is the quiescent current the regulator consumes at
IOUT(max).
Once the value of PD(max) is known, the maximum permis-
sible value of RQJA can be calculated:
RQJA =
(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
heatsink will be required.
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:
RQJA = RQJC + RQCS + RQSA
(3)
where:
RQJC = the junctionÐtoÐcase thermal resistance,
RQCS = the caseÐtoÐheatsink thermal resistance, and
RQSA = the heatsinkÐtoÐambient 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 inter-
face between them. These values appear in heat sink data
sheets of heat sink manufacturers.
150¡C - T
A
PD
Calculating Power Dissipation
in a Single Output Linear Regulator
Application Notes: continued
Heat Sinks
VIN
Smart
Regulator
VOUT
IOUT
IIN
IQ
Control
Features
}
Figure 7. Single output regulator with key performance parameters
labeled.
RESET
VOUT
RRST
C2**
10
mF
CRST
ENABLE
VIN
C1*
0.1
mF
to
mP
RESET
Port
5V to
mP and
System
Power
CS-8120
Figure 6. Circuit showing output compensation capacitor.
*C1 is required if regulator is far from power source filter.
**C2 is required for stability.


유사한 부품 번호 - CS8120YTVA5

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   5.0 V, 300 mA Linear Regulator with RESET and ENABLE
January, 2004 ??Rev. 8
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