參數(shù)資料
型號: IL300
廠商: VISHAY SEMICONDUCTORS
元件分類: 光電耦合器
英文描述: Optocoupler DC-IN 1-CH Linear Photovoltaic DC-OUT 8-Pin PDIP-8A
中文描述: High Linearity Optocouplers High Gain Wide Bandwidth Linear
文件頁數(shù): 8/11頁
文件大?。?/td> 186K
代理商: IL300
IL300
www.vishay.com
Vishay Semiconductors
Rev. 1.7, 23-Sep-11
8
Document Number: 83622
For technical questions, contact:
optocoupleranswers@vishay.com
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/doc91000
Table 1. Gives the value of R5 given the production K3 bin.
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.
V
- V
F
I
Fq
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.
Fig. 14 - Transfer Gain
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.
TABLE 1 - R5 SELECTION
BIN
K3
MAX.
0.623
0.693
0.769
0.855
0.950
1.056
1.175
1.304
1.449
1.610
R5 RESISTOR
1 % k
Ω
51.1
45.3
41.2
37.4
32.4
30
27
24
22
19.4
MIN.
0.560
0.623
0.693
0.769
0.855
0.950
1.056
1.175
1.304
1.449
TYP.
0.59
0.66
0.73
0.81
0.93
1
1.11
1.24
1.37
1.53
A
B
C
D
E
F
G
H
I
J
R4
--------------------------------
12 mA
---------------------------------
100
Ω
=
=
=
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
V
o
V
out
= 14.4 mV + 0.6036 x V
in
LM 201 T
a
= 25 °C
iil300_20
6.0
5.5
5.0
4.5
V
in
- Input Voltage (V)
4.0
- 0.015
- 0.010
- 0.005
0.000
0.005
0.010
0.015
0.020
0.025
L
LM201
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