ISL28005 datasheet(13/16 Pages) RENESAS

13 / 16 page

ISL28005

FN6973 Rev 5.00

Page 13 of 16

October 24, 2013

Overall Accuracy (VOA %)

VOA is defined as the total output accuracy Referred-to-Output

(RTO). The output accuracy contains all offset and gain errors, at

a single output voltage. Equation 2 is used to calculate the %

total output accuracy.

where

VOUT Actual = VSENSE x GAIN

Example: Gain = 100, For 100mV VSENSE input we measure

10.1V. The overall accuracy (VOA) is 1% as shown in Equation 3.

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 using Equation 4:

where:

•PDMAXTOTAL is the sum of the maximum power dissipation of

each amplifier in the package (PDMAX)

•PDMAX for each amplifier can be calculated using Equation 5:

where:

•TMAX = Maximum ambient temperature

•

JA = Thermal resistance of the package

•PDMAX = Maximum power dissipation of 1 amplifier

•VCC = Total supply voltage

•IqMAX = Maximum quiescent supply current of 1 amplifier

•VOUTMAX = Maximum output voltage swing of the application

•RL = Load resistance

FIGURE 30. TYPICAL APPLICATION CIRCUIT

gmHI

gmLO

1.35V

OUT

VCC

I = 2.86µA

GND

RS-

(1mΩ

0.1Ω)

0.1VDC

28VDC

LOAD

2.7VDC

28VDC

RS+

VOA

100

VOUTactual VOUT

ected

exp

–

VOUT

ected

exp

------------------------------------------------------------------------------------









(EQ. 2)

(EQ. 3)

VOA

100

10.1 10

–

------------------------







1percent

TJMAX

TMAX JAxPDMAXTOTAL

(EQ. 4)

PDMAX

VS IqMAX VS



- VOUTMAX

VOUTMAX

----------------------------



(EQ. 5)

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