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参数资料
| 型号： | IL300-DEFG |
| 厂商： | VISHAY INTERTECHNOLOGY INC |
| 元件分类： | 光电元器件 |
| 英文描述： | SPECIALTY OPTOELECTRONIC DEVICE |
| 文件页数： | 7/8页 |
| 文件大小： | 444K |
| 代理商： | IL300-DEFG |
Document Number: 83622
www.vishay.com
Revision 17-August-01
7
Table 1 gives the value of R5 given the production K3 bins.
Table 1, R5 selection
The last step in the design is selecting the LED current limiting
resistor (R4). The output of the operational amplier is targeted
to be 50% of the VCC, or 2.5 V. With an LED quiescent current
of 12 mA the typical LED (VF) is 1.3 V. Given this and the oper-
ational output voltage, R4 can be calculated.
The circuit was constructed with an LM201 differential opera-
tional amplier using the resistors selected. The amplier was
compensated with a 100 pF capacitor connected between
pins 1 and 8.
The DC transfer characteristics are shown in Figure 19. The
amplier was designed to have a gain of 0.6 and was mea-
sured 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 lin-
earity with an RMS error of only 0.0133% over the input voltage
range of 4.0 V–6.0 V in a servo mode; see Figure 20.
Bins
Min.
Max.
3
Typ.
R5
Resistor
K
1%
K
A
0.560
0.623
0.59
50.85
51.1
B
0.623
0.693
0.66
45.45
45.3
C
0.693
0.769
0.73
41.1
41.2
D
0.769
0.855
0.81
37.04
37.4
E
0.855
0.950
0.93
32.26
32.4
F
0.950
1.056
1.00
30.00
30.0
G
1.056
1.175
1.11
27.03
27.0
H
1.175
1.304
1.24
24.19
24.0
I
1.304
1.449
1.37
21.90
22.0
J
1.449
1.610
1.53
19.61
19.4
R4
V
opamp
V
F
–
I
Fq
--------------------------------
2.5V
1.3V
–
12mA
------------------------------
100
=
Figure 19. Transfer gain
Figure 20. Linearity error vs. input voltage
The AC characteristics are also quite impressive offering a -
3.0 dB bandwidth of 100 kHz, with a –45
° phase shift at 80 kHz
as shown in Figure 21.
Figure 21. Amplitude and phase power supply control
The same procedure can be used to design isolation ampliers
that accept bipolar signals referenced to ground. These ampli-
ers circuit congurations are shown in Figure 22. In order for the
amplier to respond to a signal that swings above and below
ground, the LED must be prebiased from a separate source by
using a voltage reference source (Vref1). In these designs, R3
can be determined by the following equation.
6.0
5.5
5.0
4.5
4.0
2.25
2.50
2.75
3.00
3.25
3.50
3.75
Vin - Input Voltage - V
Vout
-
Ooutput
Voltage
-
V
Vout = 14.4 mV + 0.6036 x Vin
LM 201 Ta = 25°C
6.0
5.5
5.0
4.5
4.0
-0.015
-0.010
-0.005
0.000
0.005
0.010
0.015
0.020
0.025
Vin - Input Voltage - V
Linearity
Error
-
%
LM201
dB
PHASE
Phase
Response
-
°
103
104
105
106
2
0
-2
-4
-6
-8
45
0
-45
-90
-135
-180
F - Frequency - Hz
Amplitude
Response
-
dB
R3
V
ref1
I
P1
-------------
V
ref1
K1I
Fq
---------------
=
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