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PDF TIL300A Data sheet ( Hoja de datos )
| Número de pieza | TIL300A | |
| Descripción | PRECISION LINEAR OPTOCOUPLER | |
| Fabricantes | ETC | |
| Logotipo |  |
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D ac or dc Signal Coupling
D Wide Bandwidth . . . >ā200 kHz
D High Transfer-Gain Stability . . . ±0.005%/°C
D 3500 V Peak Isolation
D Typical Applications
– Power-Supply Feedback
– Medical-Sensor Isolation
– Opto Direct-Access Arrangement (DAA)
– Isolated Process-Control Transducers
TIL300, TIL300A
PRECISION LINEAR OPTOCOUPLER
TAOS018 – AUGUST 1999
DCS OR P PACKAGE
(TOP VIEW)
LEDK
LEDA
PDK1
PDA1
1
2
3
4
8 NC
7 NC
6 PDK2
5 PDA2
NC – No internal connection
Description
The TIL300 precision linear optocoupler consists of an infrared LED irradiating an isolated feedback photodiode
and an output photodiode in a bifurcated arrangement. The feedback photodiode captures a percentage of the
flux of the LED that can be used to generate a control signal to regulate the LED drive current. This technique
is used to compensate for the nonlinear time and temperature characteristics of the LED. The output-side
photodiode then produces an output signal that is linearly proportional to the servo-optical flux emitted from the
LED.
A typical application circuit (shown in Figure 1) uses an operational amplifier as the input to drive the LED. The
feedback photodiode sources current through R1, which is connected to the inverting input of the input
operational amplifier. The photocurrent IP1 assumes a magnitude that satisfies the relationship IP1 = VI/R1. The
magnitude of the current is directly proportional to the LED current through the feedback transfer gain
K1(VI/R1 = K1 × IF). The operational amplifier supplies LED current to produce sufficient photocurrent to keep
the node voltage Vb equal to node voltage Va.
+
VI
–
R1
1VCC+
Va
+
Vb _
1VCC–
1
P
R3 2
IF
3
1VCC+
4
P IP1
TIL300
K2
K1
6 2VCC+
5
2VCC+
–
+
IP2 R2 2VCC–
VO = K3(R2/R1) VI
NOTES: A. K1 is servo current gain, the ratio of the feedback servo photodiode current (IP1) to the input LED current (IF), i.e. K1 = IP1/IF.
B. K2 is forward gain, the ratio of the output photodiode current (IP2) to the input LED current (IF), i.e. K2 = IP2/IF.
C. K3 is transfer gain, the ratio of the forward gain to the servo gain, i.e. K3 = K2/K1.
Figure 1. Typical Application Circuit
The output photodiode is connected to a noninverting voltage follower; R2 is used to develop a voltage from
the photodiode current. The output of the amplifier is VO = K2IFR2. Overall transfer gain VO/VI becomes
VO/VI = (K2IFR2/K1IFR1). Factoring out the LED forward current IF and remembering that K2/K1 = K3, the
overall transfer gain becomes VO/VI = K3R2/R1. The overall transfer gain, therefore, is shown to be
independent of the LED current.
www.taosinc.com
Texas Advantced Optoelectronic Solutions Inc.
800 Jupiter Road, Suite 205 S Plano, TX 75074 S (972) 673-0759
t
Copyright © 2000, TAOS Inc.
1
1 page  
TIL300, TIL300A
PRECISION LINEAR OPTOCOUPLER
TYPICAL CHARACTERISTICS
TAOS018 – AUGUST 1999
LED FORWARD CURRENT
vs
LED FORWARD VOLTAGE
30
TA = 25°C
25
LED FORWARD CURRENT
vs
LED FORWARD VOLTAGE
100
TA = 25°C
20 10
15
10
5
0
1 1.1 1.2 1.3 1.4 1.5 1.6
VF – LED Forward Voltage – V
Figure 2
SERVO PHOTODIODE CURRENT
vs
LED FORWARD CURRENT AND TEMPERATURE
500
450 TA = 0°C
400 TA = 25°C
350 TA = 50°C
300 TA = 75°C
250
200
150
100
50
0
0.1 1
10
IF – LED Forward Current – mA
100
Figure 4
1
0.1
1
1.1 1.2 1.3 1.4 1.5
VF – LED Forward Voltage – V
Figure 3
1.6
SERVO PHOTODIODE CURRENT
vs
LED FORWARD CURRENT AND TEMPERATURE
1000
700
400 TA = 0°C
200 TA = 25°C
100 TA = 50°C
70
40 TA = 75°C
20
10
7
4
2
10.1 0.2 0.4 0.7 1 2 4 7 10 20 40 70 1000
IF – LED Forward Current – mA
Figure 5
www.taosinc.com
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| Páginas | Total 10 Páginas | |
| PDF Descargar | [ Datasheet TIL300A.PDF ] | |
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