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AN2317 Datasheet(PDF) 16 Page - STMicroelectronics

Part # AN2317
Description  Energy Metering IC External Circuits
PDF  27 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN2317 Datasheet(HTML) 16 Page - STMicroelectronics

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External Circuit Design
AN2317 - Application
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Equation 20
Equation 21
Equation 22
Equation 23
Z1 has little influence on the U0, thus:
Equation 24
Note:
For a specific U0, choose an appropriate combination of resistors (R5 and R’) to get that
particular U0 value.
Z
1
R
19
R
15
+
()
42.3K
Ω
==
Z
2
R
5
R
6
+
() Z
1
⋅
R
5
R
6
Z
1
++
------------------------------------
930
Ω
==
U
1
U
2
–
Z
2
2
------
2R
′ Z
2
+
---------------------- V
mains
V
mains
110 2V U
1
0.046V
=
,
=
V
mains
220 2V U
1
0.092V
=
,
=
⎩
⎪
⎨
⎪
⎧
=
⋅
==
U
0
U
1
U
2
–
Z
2
2
------
R
′
Z
2
2
-------
+
------------------- V
mains
V
mains
110 2V U
0
0.092V
=
,
=
V
mains
220 2V U
0
0.185V
=
,
=
⎩
⎪
⎨
⎪
⎧
=
⋅
==
U0
R
5
R
′ R
5
+
-------------------
≈



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