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UM0969 датащи(PDF) 14 Page - STMicroelectronics

номер детали UM0969
подробное описание детали  3-phase motor control demonstration board featuring IGBT intelligent power module STGIPS10K60A
PDF  46 Pages
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производитель  STMICROELECTRONICS [STMicroelectronics]
домашняя страница  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

UM0969 датащи(HTML) 14 Page - STMicroelectronics

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Board description
UM0969
14/46
Doc ID 17665 Rev 2
Default values for the STEVAL-IHM027V1 are:
●
r = 1 k
Ω (R11, R25, R30)
●
R = 5.4 k
Ω (R12-13, R21-22, R31-32)
●
R1 = 560
Ω (R4, R15, R27)
●
R2 = 560
Ω (R7, R18, R28)
●
R3 = 4.7 k
Ω (R1, R16, R26)
The op amp is used in follower mode and its gain can be set by resistor r and R:
Equation 1
VOUT (op amp output voltage) can be calculated as a sum of two components:
●
VBIAS: due to network polarization
●
VSIGN: the signal component
Equation 2
VOUT maximum value is 3.3 V according to the MCU maximum input rating.
Equation 3
Equation 4
Equation 5
With the default values:
●
G = 6.4
●
VBIAS = 1.8 V
●
GTOT = 3
●
Maximum current amplifiable without distortion is 5 A
It is possible to modify the maximum current value by simply changing the resistor values.
r
r
R
G
+
=
BIAS
SIGN
OUT
V
V
V
+
=
G
3
R
3
R
1
2
R
1
1
R
1
5
V
BIAS
⋅
⋅
⎟⎟
⎠
⎞
⎜⎜
⎝
⎛
+
+
=
⋅
⋅
⋅
G
1
R
3
R
1
2
R
1
1
R
1
Rs
I
V
SIGN
⋅
⋅
⎟⎟
⎠
⎞
⎜⎜
⎝
⎛
+
+
⋅
=
⋅
⋅
⋅
1
R
3
R
1
2
R
1
1
R
1
G
I
Rs
V
G
SIGN
TOT
⋅
⎟⎟
⎠
⎞
⎜⎜
⎝
⎛
+
+
=
⋅
=
⋅
⋅
⋅



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