IL300 데이터 시트보기 (PDF) - Siemens AG
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IL300 Datasheet PDF : 8 Pages
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Table 1 gives the value of R5 given the production K3 bins.
Table 1. R5 selection
Bins
Min.
Max.
A
0.560 0.623
B
0.623 0.693
C
0.693 0.769
D
0.769 0.855
E
0.855 0.950
F
0.950 1.056
G
1.056 1.175
H
1.175 1.304
I
1.304 1.449
J
1.449 1.610
K3
Typ.
0.59
0.66
0.73
0.81
0.93
1.00
1.11
1.24
1.37
1.53
R5
Resistor
KΩ
50.85
45.45
41.1
37.04
32.26
30.00
27.03
24.19
21.90
19.61
1%
KΩ
51.1
45.3
41.2
37.4
32.4
30.0
27.0
24.0
22.0
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 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 opera-
tional output voltage, R4 can be calculated.
.
Vopamp – VF 2.5V – 1.3V
R4= -------------I--F---q--------------= --------1---2----m-----A----------= 100Ω
The circuit was constructed with an LM201 differential opera-
tional amplifier using the resistors selected. The amplifier was
compensated with a 100 pF capacitor connected between pins
1 and 8.
The DC transfer charateristics are shown in Figure 19. The
amplifier was designed to have a gain of 0.6 and was mea-
sured to be 0.6036. Greater accurracy 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 V–6 V in a servo mode; see Figure 20.
Figure 19. Transfer gain
3.75
Vout = 14.4 mV + 0.6036 x Vin
3.50
LM 201 Ta = 25°C
3.25
Figure 20. Linearity error vs. input voltage
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
Vin - Input Voltage - V
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 21.
Figure 21. Amplitude and phase power supply control
2
45
0
0
dB
-2
-45
PHASE
-4
-90
-6
-135
-8
10
3
10 4
10 5
F - Frequency - Hz
10 -6180
The same procedure can be used to design isolation amplifiers
that accept biploar signals referenced to ground. These amplifi-
ers circuit configurations are shown in Figure 22. In order for the
amplifier 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.
Vref1 Vref1
R3= ---I--P---1----= K-----1----I-F---q--
3.00
2.75
2.50
2.25
4.0
4.5
5.0
5.5
6.0
Vin - Input Voltage - V
IL300
5–7
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