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ISL28005 Datasheet(PDF) 12 Page - Intersil Corporation

Part No. ISL28005
Description  Micropower, Rail-to-Rail Input Current Sense Amplifier
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Maker  INTERSIL [Intersil Corporation]
Homepage  http://www.intersil.com/cda/home
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ISL28005 Datasheet(HTML) 12 Page - Intersil Corporation

 
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ISL28005
12
FN6973.4
July 1, 2011
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
θJA = 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 22. TYPICAL APPLICATION CIRCUIT
gmHI
gmLO
1.35V
+
-
OUT
VCC
I = 2.86µA
GND
RS
RS-
RP
(1mΩ
TO
0.1Ω)
0.1VDC
TO
28VDC
+
-
CD
LOAD
CM
2.7VDC
TO
28VDC
RS+
VOA
100
VOUTactual VOUT
ected
exp
VOUT
ected
exp
------------------------------------------------------------------------------
⎝⎠
⎜⎟
⎛⎞
×
=
(EQ. 2)
(EQ. 3)
VOA
100
10.1 10
10
-------------------------
⎝⎠
⎛⎞
×
1percent
==
TJMAX
TMAX θJAxPDMAXTOTAL
+
=
(EQ. 4)
PDMAX
VS IqMAX VS
(
- VOUTMAX)
VOUTMAX
RL
------------------------
×
+
×
=
(EQ. 5)


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