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AN4439 Datasheet(PDF) 6 Page - STMicroelectronics

Part # AN4439
Description  L99ASC03 current sense amplifier offset adjust
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN4439 Datasheet(HTML) 6 Page - STMicroelectronics

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Calculating the input resistor values
AN4439
6/16
DocID025908 Rev 1
2
Calculating the input resistor values
We first calculate the voltages needed at the output of the first stage (VOUT1_0A) at the four
different second stage gain settings.
Figure 3. Second stage Op-Amp
A simple KCL equation:
Equation 1
where xR2 can be defined by the programmed gain as:
Equation 2
Solving for VOUT1_0V provides:
Equation 3
Looking at the CSI+ input we determine what the voltage (Vx, lower case x) at the Op-Amp
pins must be to generate VOUT1_0V. We set CSI+ to 0V to simplify the equation.
V
OUT1_0V
V
X
R
2
----------------------------------------
V
X
xR
2
----------
=
xR
2
A
V2 R2
=
V
OUT1_0V
R
2
V
X
V
X
xR
2
+
xR
2
------------------------------------------------
=


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