CS8371ETVA7 datasheet(7/8 Pages) CHERRY

Part #	CS8371ETVA7

Description	8V/1A, 5V/250mA Dual Regulator with Independent Output Enables and NoCap

Download	8 Pages

Scroll/Zoom	100%

Manufacturer	CHERRY [Cherry Semiconductor Corporation]

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

Logo

7 / 8 page

7

Applications Notes: continued

Calculating Power Dissipation

in a Dual Output Linear Regulator

The maximum power dissipation for a dual output regu-

lator (Figure 1) is

PD(max) = {VIN(max) Ð VOUT1(min)}IOUT1(max) +

{VIN(max) Ð VOUT2(min)}IOUT2(max) + VIN(max)IQ,

(1)

where

VIN(max) is the maximum input voltage,

VOUT

1(min) is the minimum output voltage from VOUT1,

VOUT

2(min) is the minimum output voltage from VOUT2,

IOUT

1(max) is the maximum output current, for the appli-

cation,

IOUT

2(max) is the maximum output current, for the appli-

cation,

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 R

QJA can be calculated:

R

QJA =

(2)

The value of R

QJA can then be compared with those in

the package section of the data sheet. Those packages

with R

QJA'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.

Heatsinks

A heatsink 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 R

QJA:

R

QJA = RQJC + RQCS + RQSA,

(3)

where

R

QJC = the junctionÐtoÐcase thermal resistance,

R

QCS = the caseÐtoÐheatsink thermal resistance, and

R

QSA = the heatsinkÐtoÐambient thermal resistance.

R

QJC appears in the package section of the data sheet. Like

R

QJA, 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 heatsink data

sheets of heatsink manufacturers.

150¡C - T

A

PD

VIN

VOUT2

IIN

IQ

Control

Features

}

IOUT2

VOUT1

IOUT1

Smart

Regulator

Figure 1: Dual output regulator with key performance parameters

labeled.

Similar Part No. - CS8371ETVA7

Manufacturer	Part #	Datasheet	Description
ON Semiconductor	CS8371ETVA7	98Kb / 11P	8.0 V/1.0 A, 5.0 V/250 mA Dual Regulator with Independent Output Enables and NOCAP June, 2006 ??Rev. 12
ON Semiconductor	CS8371ETVA7G	98Kb / 11P	8.0 V/1.0 A, 5.0 V/250 mA Dual Regulator with Independent Output Enables and NOCAP June, 2006 ??Rev. 12

More results

Similar Description - CS8371ETVA7

Manufacturer	Part #	Datasheet	Description
ON Semiconductor	CS8371	98Kb / 11P	8.0 V/1.0 A, 5.0 V/250 mA Dual Regulator with Independent Output Enables and NOCAP June, 2006 ??Rev. 12
STMicroelectronics	STV8131	68Kb / 5P	5V AND 8V VOLTAGE REGULATOR
ON Semiconductor	CS8164	83Kb / 8P	8V/5V Low Dropout Dual Regulator December, 2001 - Rev. 4
Cherry Semiconductor Co...	CS8164	167Kb / 8P	8V/5V Low Dropout Dual Regulator with ENABLE
KODENSHI_AUK CORP.	KKA8133A	101Kb / 4P	DUAL 5.1V 8V REGULATOR WITH DISABLE AND RESET
Cherry Semiconductor Co...	CS8121	205Kb / 8P	5V, 1A Linear Regulator with and ENABLE RESET
Cherry Semiconductor Co...	CS8391	152Kb / 6P	5V/250mA, 5V/100mA Micropower Low Dropout Regulator with ENABLE
First Components Intern...	FGM78R05	206Kb / 7P	1A / 5V Output low dropout voltage regulator;
Cherry Semiconductor Co...	CS8281	153Kb / 6P	5V/250mA, 5V/100mA Micropower Low Dropout Regulator with ENABLE
Murata Manufacturing Co...	MPD7K046S	543Kb / 5P	12V main output and 5V,1A Aux output

More results

CS8371ETVA7 Datasheet(PDF) 7 Page - Cherry Semiconductor Corporation

CS8371ETVA7 Datasheet(HTML) 7 Page - Cherry Semiconductor Corporation

Similar Part No. - CS8371ETVA7

Similar Description - CS8371ETVA7

Html Pages

1 2 3 4 5 6 7 8

Datasheet Download

Link URL