CS8147 datasheet(7/8 Pages) CHERRY

Part #	CS8147

Description	10V/5V Low Dropout Dual Regulator with ENABLE

PDF	8 Pages

Scroll/Zoom	100%

Manufacturer	CHERRY [Cherry Semiconductor Corporation]

Direct Link	http://www.cherrycorp.com/

Logo

7 / 8 page

Application Notes: continued

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.

VIN

Smart

Regulator

VOUT1

IOUT1

IIN

Control

Features

}

VOUT2

IOUT2

Figure 1: Dual output regulator with key performance parameters

labeled.

Heat Sinks

CS8147 Datasheet(PDF) 7 Page - Cherry Semiconductor Corporation