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CS5257A-1 데이터시트(PDF) 9 Page - ON Semiconductor

부품명 CS5257A-1
상세설명  7.0 A LDO 5?뭁in Adjustable Linear Regulator
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제조업체  ONSEMI [ON Semiconductor]
홈페이지  http://www.onsemi.com
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CS5257A-1 데이터시트(HTML) 9 Page - ON Semiconductor

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CS5257A−1
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PD(max) + (VIN(max) * VOUT(min))IOUT(max)
) VIN(max)
IIN(max)
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 has a thermal
resistance which is measured in degrees per watt. Like series
electrical resistances, these thermal resistances are summed
to determine the total thermal resistance between the die
junction and the surrounding air, RqJA. This total thermal
resistance is comprised of three components. These resistive
terms are measured from junction to case (RqJC), case to heat
sink (RqCS), and heat sink to ambient air (RqSA). The
equation is:
RQJA + RQJC ) RQCS ) RQSA
The value for RqJC is 1.4°C/watt for the CS5257A−1 in
both the TO−220−5 and D2PAK−5 packages. For a high
current regulator such as the CS5257A−1 the majority of
heat is generated in the power transistor section. The value
for RqSA depends on the heat sink type, while the RqCS
depends on factors such as package type, heat sink interface
(is an insulator and thermal grease used?), and the contact
area between the heat sink and the package. Once these
calculations are complete, the maximum permissible value
of RqJA can be calculated and the proper heat sink selected.
For further discussion on heat sink selection, see our
application note “Thermal Management,” document
number AND8036/D, available through the Literature
Distribution
Center
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via
our
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at
http://www.onsemi.com.


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