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2
AN142.0
May 5, 2005
On the following charts, errors are calculated as follows:
Raw error:
Average error:
Average error after offset and gain adjust:
Worst case error at 0°C, after offset and gain adjust:
Worst case error at 50°C, after offset and gain adjust:
Where:O = Output
I = Input
G = Gain
avg = Average
std = Standard Deviation
off = offset
OG = Offset/Gain
(x) = at x degrees C
Overall Performance
The following set of graphs shows the performance of the
X3100 over temperature and across three lots of five
devices. The graphs will show the basic input/output curve,
raw error, and error after correction for offset and gain.
The below data shows that the error at the x10 gain is the
lowest. Using a 20mΩ current sense resistor, and
considering 3 standard deviations from the worst case
temperature (over 3 manufacturing lots), the X3100 output is
accurate to less than 1.4% at 300mA of load current and
above. At a gain of 25, the X3100 has less than 5% error at a
load current of 50mA. This error declines at higher currents
to about the same as the x10 gain. At all gains, the error
increases as the input current decreases.
Comments
The AO pin on the X3100 is biased to a nominal 2.5V when
reading the voltage across the VCS1 and VCS2 pins.
However, there is an offset to this value that can make the
output (at 0V input) either higher or lower than this 2.5V
nominal value. The output with 0V current sense input
ranged from 1.8 to 2.9V for the devices under test (at a gain
of 160). The difference in voltage between the nominal
output and the actual output becomes more apparent at
higher gains. This is due to a small input offset in the current
sense amplifier that is magnified at the output by the gain of
the amplifier. This offset is mostly cancelled by reading the
voltage across the CSI pins in both directions and
subtracting the two values.
While the process of reading the voltage in both directions and
subtracting the two values cancels most of the offset on the
X3100 current sense amplifier, it does not cancel it all. The
remaining output offset is approximately 668uV at a gain of 10,
1.7mV at a gain of 25, 5.7mV at a gain of 80 and 11mV at a
gain of 160. This offset becomes significant at the lowest input
voltages, since it can be nearly the same voltage as the
expected output. In some of the charts that follow, the output
has been compensated by subtracting this offset from the
recorded values. This cancels out the error for average
conditions, but leaves large errors at small input voltages due to
variations in this offset. With the test setup used it is not
possible to determine whether these offset error variations are
caused by the environment or the device.
The charts in this document that show errors after offset
compensation use an average offset value. This value is an
average over all devices across all temperatures. To improve
the accuracy, especially at lower input voltages, a calibration
procedure could be used. This calibration procedure would
apply 0V across the VCS1 and VCS2 pins. Then, at each gain
setting, the measured output (after reading in both directions
and subtracting) is saved as a common offset value.
The gain adjust is determined by dividing the output by the
input voltage. The gain is averaged over all inputs and all
devices at all temperatures. This average value is then used to
divide into the output reading to determine the compensated
error. Based on the data collected, the average gain for the 160
setting is 160.17, the average gain for the 80 setting is 79.24,
the average gain for the 25 setting is 24.53 and the average
gain for the 10 setting is 9.77. Using these average values will
reduce the error when computing the input current. However to
improve the accuracy further, each device can be calibrated for
the particular gain. To do this, apply a known current across the
current sense resistor. Use a current that is relatively high, such
as 500mA. At each gain read the output and divide this by the
known input. Use this gain value in subsequent calculations.
Raw
O
G
----
I–
I
------------
=
Avg
avgO
G
---------------
I–
I
-----------------------
=
AvgOGadj
avgO avgoff–
avgG
----------------------------------------
I–
I
------------------------------------------------
=
StdOGadj 0()
avgO 0() 3std0()×+
avgG
--------------------------------------------------------- -
I–
I
-----------------------------------------------------------------
=
StdOGadj 50()
avgO 50()3std50()×–
avgG
----------------------------------------------------------------
I–
I
------------------------------------------------------------------------
=
Application Note 142