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PDF IL300 Data sheet ( Hoja de datos )
| Número de pieza | IL300 | |
| Descripción | LINEAR OPTOCOUPLER | |
| Fabricantes | Siemens Semiconductor Group | |
| Logotipo |  |
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IL300
LINEAR OPTOCOUPLER
FEATURES
• Couples AC and DC signals
• 0.01% Servo Linearity
• Wide Bandwidth, >200 KHz
• High Gain Stability, ±0.005%/C
• Low Input-Output Capacitance
• Low Power Consumption, < 15mw
• Isolation Test Voltage, 5300 VACRMS,
1 sec.
• Internal Insulation Distance, >0.4
mm
for VDE
• Underwriters Lab File #E52744
• VDE Approval #0884 (Optional with
Option 1, Add -X001 Suffix)
• IL300G Replaced by IL300-X006
APPLICATIONS
• Power Supply Feedback Voltage/
Current
• Medical Sensor Isolation
• Audio Signal Interfacing
• Isolate Process Control Transducers
• Digital Telephone Isolation
DESCRIPTION
The IL300 Linear Optocoupler consists of
an AlGaAs IRLED irradiating an isolated
feedback and an output PIN photodiode
in a bifurcated arrangement. The feed-
back photodiode captures a percentage
of the LED's flux and generates a control
signal (IP1) that can be used to servo the
LED drive current. This technique com-
pensates for the LED's non-linear, time,
and temperature characteristics. The out-
put PIN photodiode produces an output
signal (IP2) that is linearly related to the
servo optical flux created by the LED.
The time and temperature stability of the
input-output coupler gain (K3) is insured
by using matched PIN photodiodes that
accurately track the output flux of the
LED.
A typical application circuit (Figure 1)
uses an operational amplifier at the circuit
input to drive the LED. The feedback
photodiode sources current to R1 con-
nected to the inverting input of U1. The
photocurrent, IP1, will be of a magnitude
to satisfy the relationship of (IP1=VIN /R1).
Dimensions in inches (mm)
.268 (6.81)
.255 (6.48)
43
Pin One I.D.
21
1
56 78
.390 (9.91)
.379 (9.63)
2
K1
3
4
8
7
K2
6
5
.045 (1.14) .150 (3.81)
.030 (.76) .130 (3.30)
.305 Typ.
(7.75) Typ.
4° Typ.
.022 (.56)
.018 (.46)
.040 (1.02)
.030 (.76 )
.100 (2.54) Typ.
10 ° Typ.
3°–9°
.012 (.30)
.008 (.20)
.135 (3.43)
.115 (2.92)
DESCRIPTION (continued)
The magnitude of this current is directly proportional to the feedback transfer gain
(K1) times the LED drive current (VIN /R1=K1 • IF). The op-amp will supply LED cur-
rent to force sufficient photocurrent to keep the node voltage (Vb) equal to Va
The output photodiode is connected to a non-inverting voltage follower amplifier. The
photodiode load resistor, R2, performs the current to voltage conversion. The output
amplifier voltage is the product of the output forward gain (K2) times the LED current
and photodiode load, R2 (VO=IF • K2 • R2).
Therefore, the overall transfer gain (VO/VIN) becomes the ratio of the product of the
output forward gain (K2) times the photodiode load resistor (R2) to the product of the
feedback transfer gain (K1) times the input resistor (R1). This reduces to VO/VIN=
(K2 • R2)/(K1 • R1). The overall transfer gain is completely independent of the LED
forward current. The IL300 transfer gain (K3) is expressed as the ratio of the ouput
gain (K2) to the feedback gain (K1). This shows that the circuit gain becomes the
product of the IL300 transfer gain times the ratio of the output to input resistors [VO/
VIN=K3 (R2/R1)].
Figure 1. Typical application circuit
+ Va +
Vin U1
Vb -
R1
VCC
IF
VCC
lp 1
1 IL300
2
K1
3
K2
4
8
7
6 VCC
5 Vc
lp 2 R2
- VCC
U2
+
Vout
5–1
1 page  
Figure 10. Transfer gain vs. LED current and temperature
1.010
0°C
1.005
25°C
1.000
0.995
50°C
75°C
0.990
0
5 10 15 20
IF - LED Current - mA
25
Figure 11. Normalized transfer gain vs. LED current
and temperature
1.010
0°C Normalized to IF=10 mA, TA=25°C
1.005
25°C
1.000
0.995
50°C
75°C
0.990
0
5 10 15
IF - LED Current - mA
20
25
Figure 12. Amplitude response vs. frequency
5
IF=10 mA, Mod=± 2 mA (peak)
0
RL=1 KΩ
-5
-10
RL=10 KΩ
-15
-20
10
4
10 5
F - Frequency - Hz
10 6
Figure 13. Amplitude and phase response vs. frequency
5 45
dB
PHASE
00
-5 -45
-10
IFq=10 mA
Mod=± 4 mA
-15 TA=25°C
RL=50 Ω
-20
10
3
10 4 10 5 10 6
F - Frequency - Hz
-90
-135
10 7-180
Figure 14. Common mode rejection
-60
-70
-80
-90
-100
-110
-120
-130
10
100 1000 10000 100000 1000000
F - Frequency - Hz
Figure 15. Photodiode junction capacitance vs. reverse
voltage
14
12
10
8
6
4
2
0
0 2 4 6 8 10
Voltage - Vdet
Application Considerations
In applications such as monitoring the output voltage from a
line powered switch mode power supply, measuring bioelectric
signals, interfacing to industrial transducers, or making floating
current measurements, a galvanically isolated, DC coupled
interface is often essential. The IL300 can be used to construct
an amplifier that will meet these needs.
The IL300 eliminates the problems of gain nonlinearity and drift
induced by time and temperature, by monitoring LED output
flux.
A PIN photodiode on the input side is optically coupled to the
LED and produces a current directly proportional to flux falling
on it . This photocurrent, when coupled to an amplifier, provides
the servo signal that controls the LED drive current.
The LED flux is also coupled to an output PIN photodiode. The
output photodiode current can be directly or amplified to sat-
isfy the needs of succeeding circuits.
Isolated Feedback Amplifier
The IL300 was designed to be the central element of DC cou-
pled isolation amplifiers. Designing the IL300 into an amplifier
that provides a feedback control signal for a line powered
switch mode power is quite simple, as the following example
will illustrate.
See Figure 17 for the basic structure of the switch mode supply
using the Siemens TDA4918 Push-Pull Switched Power Supply
Control Chip. Line isolation and insulation is provided by the
high frequency transformer. The voltage monitor isolation will
be provided by the IL300.
IL300
5–5
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet IL300.PDF ] | |
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