CS8129 Просмотр технического описания (PDF) - Cherry semiconductor

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CS8129

5V, 750mA Low Dropout Linear Regulator with Lower RESET Threshold

Cherry semiconductor 

Application Notes: continued

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.

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.

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