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UM1491 Datasheet(PDF) 17 Page - STMicroelectronics

Part # UM1491
Description  100 W 3-phase inverter demonstration board using the L6390 and STD5N52U for vector control
PDF  25 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

UM1491 Datasheet(HTML) 17 Page - STMicroelectronics

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UM1491
STEVAL-IHM021V2 schematic diagrams
Doc ID 022479 Rev 1
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8.3
Current sensing amplifying network
Figure 10 shows the current sensing amplifying network during phase 2.
Figure 10.
Current sensing amplifying network
The voltage at node “OPOUT2” can be computed as the sum of a bias and a signal
component, respectively equal to:
Equation 4
Equation 5
With the default values this gives:
●
●
As such, the maximum current amplifiable without distortion is equal to:
Equation 6
⎟
⎠
⎞
⎜
⎝
⎛
+
+
+
=
R42
R39
R38
1
R41//R43
R36
R41//R43
3.3
VBIAS
⎟
⎠
⎞
⎜
⎝
⎛
+
+
+
⋅
⋅
=
R42
R39
R38
1
R36//R43
R41
R36//R43
R
I
V
SHUNT
SIGN
V
1.86
VBIAS =
I
R
2.91
V
SHUNT
SIGN
⋅
⋅
=
A
1
.
1
R
495
.
0
R
91
.
2
86
.
1
3
.
3
I
SHUNT
SHUNT
MAX
=
=
⋅
−
=



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