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Hi Jason, thanks for another great article – I’ve enjoyed all your embedded related articles so far! The third technique listed above, keeping the base-collector junction from saturating, is possible to use, if we connect a Schottky diode from base to collector; this keeps the collector from going more than about 0.
R1 and R4 are the basic resistors setting input current and output load. This capacitance has to be charged up to turn the transistor on, and discharged to turn it off.
This will speed-up turn-off times. Changing flux induced a circulating current in the ground plane, that caused extra power losses. On the firmware side, we were getting concerned, as a deadline was approaching and we still had problems. And everyone in the chain gets a share of the profits.
The first technique listed above, pushing charge in or pulling charge out, is possible to use as well. The moral of this story… well, there are several lessons here. 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. Comparators are optimized to be fast. Designs have to work first, and be inexpensive second. Nowadays the semiconductor industry has overwhelmingly switched to CMOS, not only for digital logic and microprocessors, but also for analog and power semiconductors, primarily because of its low static power utilization.
Comments Write a Comment Select dwtasheet add a comment [ – ].
To post a new comment not a reply to a comment check out the ‘Write a Comment’ tab at the top of the comments. Keep base-collector junction from saturating. Eventually we got an updated prototype. Foxtrot sent us the first few prototypes.
The other thing you didn’t mention but is worth covering is that lhv817 suffer from 3 things that cause their performance to vary: So Dataseet wrote out some flowcharts of how Dtasheet wanted the program to datasheeh at a high level, and said make it work like this.
It still had some problems, which I finally traced down to a ferrite drum-core inductor. Receive a notification when Jason Sachs publishes a new article: They worked well, but were too expensive to go into production. Optoisolators are one major exception: Collector current equals base current times beta.
After that, some uglier techniques come into play esp for sucking the charge out of the base. We had kind of an odd battery pack, and the charger needed a custom design. We called him up and asked about these. Save your cost-down energy to be ready in time for the volumes in which it will pay off. But first I need to go on a short tangent and vent. One trick to reduce this impact on critical circuit nodes used in solderless breadboards, is to leave an empty row between each circuit node.
Optimizing Optoisolators, and Other Stories of Making Do With Less – Jason Sachs
Three or four decades ago, if you mentioned transistors, the implication was that you were probably talking about bipolar transistors rather than MOSFETs. Power bipolar transistors might have a current gain in the range, and there were all sorts of tricks for driving them on and off quickly.
Circuit Design Analog Circuits Optimization. Schottky clamp D2 is datashet BAT54 diode, which serves to keep the phototransistor from entering saturation. Without that resistor, the only way for charge to get pulled out of the base is via the base-emitter current, and it takes a while to decay. 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: Response times are much faster with a lower output impedance.
Some datashet use thicker ltg817 plating to handle high currents.