ISL28274FAZ-T7 데이터 시트보기 (PDF) - Intersil

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ISL28274FAZ-T7

Micropower, Single Supply, Rail-to-Rail Input-Output Instrumentation Amplifier and Precision Operational Amplifier

Intersil 

ISL28274, ISL28474

Power Dissipation

It is possible to exceed the +150°C maximum junction

temperatures under certain load and power-supply

conditions. It is therefore important to calculate the

maximum junction temperature (TJMAX) for all applications

to determine if power supply voltages, load conditions, or

package type need to be modified to remain in the safe

operating area. These parameters are related in Equation 1:

TJMAX = TMAX + (θJAxPDMAXTOTAL)

(EQ. 1)

where:

• PDMAXTOTAL is the sum of the maximum power

dissipation of each amplifier in the package (PDMAX)

• PDMAX for each amplifier can be calculated as shown in

Equation 2:

PDMAX

=

2*VS × ISMAX + (VS

-

VOUTMAX

)

×

V-----O----U----T----M-----A----X--

RL (EQ.

2)

where:

• TMAX = Maximum ambient temperature

• θJA = Thermal resistance of the package

• PDMAX = Maximum power dissipation of 1 amplifier

• VS = Supply voltage

• IMAX = Maximum supply current of 1 amplifier

• VOUTMAX = Maximum output voltage swing of the

application

• RL = Load resistance

18

FN6345.0

December 13, 2006

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