IL300-EF-X016 Datasheet, PDF (8/11 Pages) Vishay Siliconix – Linear Optocoupler, High Gain Stability, Wide Bandwidth

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Table 1. Gives the value of R5 given the production K3 bin.
IL300
Vishay Semiconductors
TABLE 1 - R5 SELECTION
BIN
MIN.
A
0.560
B
0.623
C
0.693
D
0.769
E
0.855
F
0.950
G
1.056
H
1.175
I
1.304
J
1.449
K3
MAX.
0.623
0.693
0.769
0.855
0.950
1.056
1.175
1.304
1.449
1.610
TYP.
0.59
0.66
0.73
0.81
0.93
1
1.11
1.24
1.37
1.53
R5 RESISTOR
1 % kΩ
51.1
45.3
41.2
37.4
32.4
30
27
24
22
19.4
The last step in the design is selecting the LED current
limiting resistor (R4). The output of the operational amplifier
is targeted to be 50 % of the V_CC, or 2.5 V. With an LED
quiescent current of 12 mA the typical LED (V_F) is 1.3 V.
Given this and the operational output voltage, R4 can be
calculated.
R4
=
V_{----o---p----a--m-----p-----}-_----V_----F-
I_Fq
=
-²---^.-⁵-----^V------^------¹---^.--³-----^V--
12 mA
=
100 Ω
The circuit was constructed with an LM201 differential
operational amplifier using the resistors selected. The
amplifier was compensated with a 100 pF capacitor
connected between pins 1 and 8.
The DC transfer characteristics are shown in figure 17. The
amplifier was designed to have a gain of 0.6 and was
measured to be 0.6036. Greater accuracy can be achieved
by adding a balancing circuit, and potentiometer in the input
divider, or at R5. The circuit shows exceptionally good gain
linearity with an RMS error of only 0.0133 % over the input
voltage range of 4 V to 6 V in a servo mode; see figure 15.
3.75
3.50
3.25
V_out = 14.4 mV + 0.6036 x V_in
LM 201 T_a = 25 °C
3.00
2.75
2.50
2.25
4.0
4.5
5.0
5.5
6.0
iil300_19
Fig. 14 - Transfer Gain
0.025
0.020
0.015
LM201
0.010
0.005
0.000
- 0.005
- 0.010
- 0.015
4.0
4.5
5.0
5.5
6.0
iil300_20
V_in - Input Voltage (V)
Fig. 15 - Linearity Error vs. Input Voltage
The AC characteristics are also quite impressive offering a
- 3 dB bandwidth of 100 kHz, with a - 45° phase shift at
80 kHz as shown in figure 16.
Rev. 1.7, 23-Sep-11
8
Document Number: 83622
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