Dual-in-line package: LTV 1-channel type. LTV 2-channel type. LTV- 4-channel type. * Wide lead spacing package: LTVM: 1-channel type. Tel: Fax: / http://www. Photocoupler. Product Data Sheet. LTV (M, S, S-TA, S-TA1, . Lite-On LTVB: available from 21 distributors. Explore Optoelectronics on Octopart: the fastest source for datasheets, pricing, specs and availability.
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This will speed-up turn-off times. Speedup capacitor and resistor C1 and R2 may be difficult to use without drawing too much current, so if I were creating a circuit board, I would keep them in my design as an insurance policy, but I would probably leave them unpopulated.
Have a very happy holiday season! The voltage gain between base and collector causes an effective multiplication of capacitance seen at datazheet base.
Most optoisolators have an input-output rating anywhere between V and V. In retrospect, I should have run away when I realized Mr. Now the phototransistor will never saturate, so we can move the Schottky clamp to Q2 instead, to prevent it from saturating. Schottky clamp D2 is a BAT54 diode, which serves to keep the phototransistor from entering saturation.
The thickness of the copper plating in a printed circuit board is conventionally measured in ounces of copper used per square foot of board area: I needed to do adtasheet tests, so I opened up the cover and looked inside. The battery requests a certain amount of current, and the charger is supposed to deliver up to that current. My rule of thumb would be to see how low of a resistance you can go without preventing the transistor from turning on, and then multiply that resistance by something in the range so you have plenty of margin.
LTV from Lite-On
Anyway, Datasgeet was barely out of school, so who was I to object? This datqsheet has to be charged up to turn the transistor on, and discharged to turn it off. Current goes in on one side, this causes current to flow on the other side, and there is no galvanic connection between input and output, so you can send a signal across a high-voltage differential. Or is it fifth? Sachs, all rights reserved.
So we got him to switch to a four-layer board, and he changed his design to use a TL power supply IC. To post a new comment not a reply to a comment check out the ‘Write a Comment’ tab at the top of the comments. This all makes a robust high speed opto design an ugly and complex process. Foxtrot to give us some information about how the code worked. And the deadline was getting closer… so we asked to look at the code itself. And more led current means more charge to pull out of the photo transistor base.
Foxtrot was a sub-sub-sub-sub-contractor. The first technique listed above, pushing charge in or pulling charge out, is possible to use as well. We called him up and asked about these. If you can get it to work but it costs more than you planned, at least you have a shot at success and can reduce cost in the future.
Lite-On LTVA – PDF Datasheet – DIP Optocouplers In Stock |
On the bottom of the circuit board, there were some 18 AWG jumper wires. Circuit designers typically use a Schottky diode clamp or a technique called the Baker clamp to keep the collector in an NPN transistor just above the saturation voltage.
But we can help it turn off faster, by connecting a resistor between base and emitter. On the firmware side, we were getting concerned, as a deadline was approaching and we still had problems. We never saw the first round of prototypes Mr. Good transistor drive circuits keep all three datasueet these effects in mind, using essentially the following techniques:. Eventually we got an updated prototype.
Optimizing Optoisolators, and Other Stories of Making Do With Less
Sign in Sign in Remember me Forgot username or password? But first I need to go on a short tangent and datashset. Receive a notification when Jason Sachs publishes a new article: But this charger caused enough electromagnetic interference that it disrupted the communications, and it stopped and displayed a fault.
And good designers knew how to make use of them. So we pulled off another layer, and there was some more rot, and then we pulled off a few more layers and it was okay again.
Another technician and I looked closer, and we found that the thermal reliefs on some of the vias were the culprit. The second round of prototypes were better, and he sent a few of them to us. One more quick comment before we do, though: One way is to reduce the magnitude of the voltage swing, so there is always at least a volt or two between collector and emitter, and the other is to use a Schottky clamp or Baker clamp to keep the collector in an NPN transistor just above the saturation voltage.
Keep collector impedance low, reduce magnitude of switching.
On one side of the package, you put in current through the LED. At the time, I posted this thread about it to the eevblog forums and someone from TI read it and corrected the site.