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UM0723 Datasheet(PDF) 22 Page - STMicroelectronics

Part # UM0723
Description  1 kW three-phase motor control demonstration board
PDF  48 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

UM0723 Datasheet(HTML) 22 Page - STMicroelectronics

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UM0723
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Doc ID 15870 Rev 4
Total gain of the circuit with the resistors’ divider is equal to:
Equation 7
with the default values this gives:
●
VBIAS = 1.7 V
●
G = 4.98
●
GTOT = 2.53
●
Maximum current amplifiable without distortion is 6.5 A.
Please observe that the user can modify the max. current value by changing the values of
the shunt resistors.
Figure 13.
Six-step current sensing configuration
V
BI AS
3.3
R1
R1
R2
+
----------------------
×
1
R3
--------
1
R1
R2
+
----------------------
1
R4
--------
++
⎝⎠
⎛⎞
R4
×
------------------------------------------------------------------------
G
×
=
V
SIGN
IR
SH UNT
R2
×
×
R1
R2
+
----------------------------------------------
IR
SHU NT
R1
×
×
1
R3
--------
1
R1
R2
+
----------------------
1
R4
--------
++
⎝⎠
⎛⎞
R1
R2
+
()
2
×
----------------------------------------------------------------------------------------------
G
×
+
=
G
TOT
V
SIGN
V
IN
----------------
V
SIGN
R
SH UNT
I
×
-------------------------------
=
=
–
+
Shunt
resistor
Smart SD
VREF
COMPARATOR
+5 V
VCC
L6390
OPAMP
–
+
OPOUT
6
9
7
10
OP+
CP+
OP–
GND
+3.3 V
R1 (R75)
R3 (R81)
r (R72)
R (R66 + R69)
R2 (R79)
R4 (R80)
AM00475



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