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参数资料
| 型号： | IL300-X019 |
| 厂商： | VISHAY SEMICONDUCTORS |
| 元件分类： | 光电元器件 |
| 英文描述： | SPECIALTY OPTOELECTRONIC DEVICE |
| 封装： | ROHS COMPLIANT, SMD, 8 PIN |
| 文件页数： | 3/15页 |
| 文件大小： | 176K |
| 代理商： | IL300-X019 |
VISHAY
IL300
Document Number 83622
Rev. 1.5, 24-Mar-05
Vishay Semiconductors
www.vishay.com
11
The last step in the design is selecting the LED cur-
rent limiting resistor (R4). The output of the opera-
tional 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.
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
19. 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
4.0 V - 6.0 V in a servo mode; see Figure 20.
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.
The same procedure can be used to design isolation
amplifiers that accept bipolar signals referenced to
ground. These amplifiers 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 pre biased from a separate
source by using a voltage reference source (Vref1). In
these designs, R3 can be determined by the following
equation.
Figure 19. Transfer Gain
Vopamp -VF
I
Fq
=
2.5 V - 1.3 V
12 mA
= 100
R4 =
17096
iil300_19
6.0
5.5
5.0
4.5
4.0
2.25
2.50
2.75
3.00
3.25
3.50
3.75
Vout
-
Output
Voltage
-
V
Vout = 14.4 mV + 0.6036 x Vin
LM 201 Ta = 25°C
Figure 20. Linearity Error vs. Input Voltage
Figure 21. Amplitude and Phase Power Supply Control
iil300_20
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
iil300_21
dB
PHASE
Phase
Response
-
°
10 3
10 4
10 5
10 6
2
0
-2
-4
-6
-8
45
0
-45
-90
-135
-180
F - Frequency - Hz
Amplitude
Response
-
d
B
R3 =
Vref1
IP1
=
Vref1
K1IFq
17098
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