CS8147 Просмотр технического описания (PDF) - Cherry semiconductor

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CS8147

10V/5V Low Dropout Dual Regulator with ENABLE

Cherry semiconductor 

Application Notes: continued

IIN

VIN

Smart

Regulator

}Control

Features

IQ

IOUT1

IOUT2

VOUT1

VOUT2

Figure 1: Dual output regulator with key performance parameters

labeled.

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.

7

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