Photocoupler s Features. 1. Current transfer ratio PC Anode mark. PC Internal connection diagram. PC PC PC PC PC PC 1. Notice The content of data sheet is subject to change without prior notice. In the absence PCXNNSZ0F Series contains an IRED optically Photocoupler. Dual-in-line package: LTV 1-channel type. LTV 2-channel type. LTV- 4-channel type. * Wide lead spacing package: LTVM: 1-channel type.
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For the optocoupker pins 4 and 6with no voltage applied to the LED pins 1, 2check with an ohmmeter the resistance between pins 4 and 6, it should be high open circuit or at least greater than 8177 megohm both ways, and this resistance should go down lower than ohms when voltage is applied to the LED, and should remain low even if the voltage is no longer present on the LED.
Any help would be apreciated. I only have a datsheet multi meter. If i give the input of V DC what will be the response of this optocoupler…. Then Pull high the collector pin of the transistor using optoccoupler resistor here I have used 1K and connect the collector pin to the output of your desired logic circuit. Geert Van Droogenbroeck on November 18, at Mihai on November 20, at 1: I guess, it should work mostly the same as a normal triac.
The Emitter pin 4 is grounded. Thank you for the information.
If the LED is good then we should check the phototransistor, you could measure it with the ohmmeter just like the LED between pins 3 and 4 the emitter and collectorand you should get a high resistance value both ways if the phototransistor is good. What if there is photo-Triac instead of Photo-transistor, How to test then? Thanks for the easy to follow explanation of how to rest an optocoupler. There pull-up resistor 1K acts as a load resistor.
This is where the isolation occurs.
Mohamed on October 9, at 9: How the optocoupler Type SFH acts when the positive line is open. But what i want to mention is there is a different testing circuit on the datasheet of H11B1.
This IC is used to provide electrical isolation between two circuits, one part of the circuit is connected to the IR LED and the other to Photo-transistor. Mihai on July 16, at 5: Good design is as little optocoupller as possible.
This comes in very handy when you are trying to isolate a noisy signal from your digital electronics, so if you are looking for an IC to provide optical isolation in your circuit design then this IC optoocupler be the right choice for you. The nice thing about standards is that you have so many to choose from. Mihai on July 15, at 8: Mihai on October 28, at Emprical method you mention above or the testing circuit on the datasheet of H11B1?
Your email address will not be published. I was wondering if i could just bypass the optcoupler and see if it works.
PC (EL)  : Sunrom Electronics/Technologies
With no voltage applied to the LED pins 1 and 2and with an open base pin 6there should be a high resistance between pins 5 and 4. Mihai on March 18, at The complete working can also be understood form the GIF file above. This way the logic input will be reflected at the logic output and still provides and isolation between the two. Here I want to show you how to check if an optocoupler is working.
Learn how your comment data is processed. Blumen on October 26, at 7: How can i test them?
Nupra on March 18, at 6: Kannan E on July 19, at 9: Ado on November 14, at I appriciate… I tried that emprical method for H11B1 optocoupler. Submitted by admin on 27 May Thank you for the information… and i have one more clarifications. Mihai on August 27, at The purpose of an optocoupler is to transfer signals from one circuit to another yet keep them galvanically isolated.
Evis on November 12, at 7: An optocoupler or optoisolatoris a device that contains a light-emitting diode LED and a photosensor photodetector, such as a photoresistor, a photodiode, a phototransistor, …etc.
Did you reffer to isolation resistance when you mention some phototransistors have high resistance? Please correct the pin numbers in image. In the datasheet example, a 10V DC is connected at the output, so that one can check the variation in voltage with a voltmeter or an oscilloscope.