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參數(shù)資料
| 型號： | IL300-X019 |
| 廠商： | VISHAY SEMICONDUCTORS |
| 元件分類： | 光電元器件 |
| 英文描述： | SPECIALTY OPTOELECTRONIC DEVICE |
| 封裝： | ROHS COMPLIANT, SMD, 8 PIN |
| 文件頁數(shù)： | 8/15頁 |
| 文件大?。?/td> | 176K |
| 代理商： | IL300-X019 |
www.vishay.com
2
Document Number 83622
Rev. 1.5, 24-Mar-05
VISHAY
IL300
Vishay Semiconductors
Operation Description
A typical application circuit (Figure 1) uses an opera-
tional 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).
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 current to force sufficient photocurrent to keep
the node voltage (Vb) equal to Va.
The output photodiode is connected to a non-invert-
ing voltage follower amplifier. The photodiode load
resistor, R2, performs the current to voltage conver-
sion. 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 output 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).
K1-Servo Gain
The ratio of the input photodiode current (IP1) to the
LED current (IF) i.e., K1 = IP1/IF.
K2-Forward Gain
The ratio of the output photodiode current (IP2) to the
LED current (IF), i.e., K2 = IP2/IF.
K3-Transfer Gain
The Transfer Gain is the ratio of the Forward Gain to
the Servo gain, i.e., K3 = K2/K1.
K3-Transfer Gain Linearity
The percent deviation of the Transfer Gain, as a func-
tion of LED or temperature from a specific Transfer
Gain at a fixed
LED current and temperature.
Photodiode
A silicon diode operating as a current source. The out-
put current is proportional to the incident optical flux
supplied by the LED emitter. The diode is operated in
the photovoltaic or photoconductive mode. In the pho-
tovoltaic mode the diode functions as a current
source in parallel with a forward biased silicon diode.
The magnitude of the output current and voltage is
dependent upon the load resistor and the incident
LED optical flux. When operated in the photoconduc-
tive mode the diode is connected to a bias supply
which reverse biases the silicon diode. The magni-
tude of the output current is directly proportional to the
LED incident optical flux.
LED (Light Emitting Diode)
An infrared emitter constructed of AlGaAs that emits
at 890 nm operates efficiently with drive current from
500
A to 40 mA. Best linearity can be obtained at
drive currents between 5.0 mA to 20 mA. Its output
flux typically changes by - 0.5 % /°C over the above
operational current range.
Application Circuit
Figure 1. Typical Application Circuit
iil300_01
8
7
6
5
K1
1
2
3
4
K2
R1
R2
IL300
Vb
Va
+
-
U1
Vin
lp 1
-
U2
+
lp 2
Vout
VCC
IF
Vc
+
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