CNY74-2 DATASHEET PDFJuly 26, 2020
CNY/ TELEFUNKEN Semiconductors. Rev. A2, Dec 1 (9). Multichannel Optocoupler with Phototransistor Output. Description. The CNY and. CNYH includes 2 isolator channels. • CNYH includes 4 isolator channels. • Isolation test voltage VISO = VRMS. • Test class 25//21 DIN 40 Features. • CNYH includes 2 isolator channels. • CNYH includes 4 isolator channels. • Isolation test voltage VISO = VRMS.
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Discussion in ‘ General Electronics Chat ‘ started by gerald81Jan 20, Jan 20, 1.
Jan 16, cyn74-2 0. Hello people, i’m new to electronic circuits. There is a simple formula to calculate the two resistor for each optocoupler? Jan 20, 2.
May 11, 5, 1, Have you done any calculations on LEDs and transistors before? It is much the same The input is a LED and the output is a transistor. I used this datasheet http: This will give you the LED voltage drop for a given current. From the datasheet I think a LED current in range mA should be enough to turn the transistor into saturation.
Go for a LED current equal to 15mA. Jan 22, 3. Jan 22, 4. The LED will also have a voltage drop. Take a look once more on figure 5. This will show the voltage drop versus current. Find the voltage drop at 15 mA and take this into your calculations please.
Jan 22, 5. Ok, looking the figure 4, at 15mA there is about 1.
CNY datasheet & applicatoin notes – Datasheet Archive
Jan 22, datahseet. Jan 22, 7. I will use a trimmer instead a resistor. As regards the resistance of the transistor, which logic do i use? Jan 22, 8. I would not have used a trimmer. You do not need a value that is ohm. If you feel for it use two resistors in series to get close to the value.
You can use figure 2. If the opto is connected to some 5 volt logic gate or controller. Use anything from 1Kohm to to 10K. I guess a 4. From the datasheet at page two. We see that the Saturation voltage, collector emitter will be at typical. Jan 22, 9.
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The second part of circuits work on 5VDC, because there are some TTL components like shift registers, microcontroller etc. Jan 22, Assume using figure 2 in the datasheet.
The voltage drop in the transistor will be typical. So the current in a 4. It should be easy now to get a picture of the resistor wattage. Jan 23, In summary, hereafter you can see the formulas for resistors wattage: But the transistor in the opto will be more or less full on with a LED current of 15mA. Hence the emitter resistor will control the current. I do not know were you got the nA from.
Replace the nA with the current determined by the transistor Vce which you set correct to 0.
Jan 24, No need to have the transistor conducting max current. And the higher current. The higher Vce voltage drop. By using a 4. You will have values well inside the spec of the opto.
TEMIC – datasheet pdf
And that is also important. So stick with figure 2 in the datasheet.
You have got how to calculate the LED series resistor correct. But use a emitter resistor in the range of 4. The output to the Arduino input port will be at the point named Channel II. And you will no problem at all. Optocoupler fails after month. Posted by shetsachin in forum: Posted by rjjenkins in forum: OptoCoupler Posted by mpuvdd in forum: You May Also Like: Tales from 80s Tech: Keep your kids engaged and get them excited about electrical engineering with these fantastic sites.
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