IL300-EF-X016 Datasheet, PDF (7/11 Pages) Vishay Siliconix – Linear Optocoupler, High Gain Stability, Wide Bandwidth

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To control
input
ISO
AMP
+1
R1
Voltage
monitor
R2
iil300_16
Fig. 11 - Isolated Control Amplifier
For best input offset compensation at U1, R2 will equal R3.
The value of R1 can easily be calculated from the following.
R1
=
R2
x


V_{----M----O----N---I--T--O----R-}
V_a
-
1_
IL300
Vishay Semiconductors
The value of R5 depends upon the IL300 Transfer Gain (K3).
K3 is targeted to be a unit gain device, however to minimize
the part to part Transfer Gain variation, Infineon offers K3
graded into ± 5 % bins. R5 can determined using the
following equation,
R5
=
--------^V---^O----^U---^T---------
V_MONITOR
x
R_-----3_-----x_-----(_---R_----1_-----+_-----R_-----2_----)
R2 x K3
or if a unity gain amplifier is being designed
(V_MONITOR = V_OUT, R1 = 0), the equation simplifies to:
R5
=
R_-----3_--
K3
110/
220
main
iil300_17
AC/DC
rectifier
Switch
Xformer
AC/DC
rectifier
DC output
Switch
mode
regulator
TDA4918
Control
Isolated
feedback
Fig. 12 - Switching Mode Power Supply
Vmonitor
R1
20 kΩ
R2
30 kΩ
3+
Va
U1
7 _VCC
6
R4
100 Ω
LM201
2
1
Vb
-
8
VCC
4
100 pF
R3
30 kΩ
IL300
1
8
2
K1
3
7
K2
6
4
5
VCC
Vout
R5
30 kΩ
To
control
input
iil300_18
Fig. 13 - DC Coupled Power Supply Feedback Amplifier
Rev. 1.7, 23-Sep-11
7
Document Number: 83622
For technical questions, contact: [e-mail]
THIS DOCUMENT IS SUBJECT TO CHANGE WITHOUT NOTICE. THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT
ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT www.vishay.com/doc?91000