 |
Electronic Components Datasheet Search |
|
|
Electronic Components Datasheet Search |
|
IL300-X009 Datasheet(PDF) 2 Page - Vishay Siliconix |
|
||||||||||||||||||||||||||||||
IL300-X009 Datasheet(HTML) 2 Page - Vishay Siliconix |
|
|
2 / 15 page  www.vishay.com 2 Document Number 83622 Rev. 1.4, 26-Oct-04 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 µA 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 VCC VCC VCC IF Vc + |
Similar Part No. - IL300-X009 |
|
Similar Description - IL300-X009 |
|
|
|
Link URL |
| Privacy Policy |
| ALLDATASHEET.COM |
| Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | Datasheet Upload | Contact us | Privacy Policy | Link Exchange | Manufacturer List All Rights Reserved©Alldatasheet.com |
| Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
|
Family Site : ic2ic.com |
icmetro.com |
English ▼
English
Chinese
German
Japanese
Russian
Korean
Spanish
French
Italian
Portuguese
Polish
Vietnamese
Indian
Mexican
British
New Zealand
