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Off my head, I cant just ramble out the way it works, but I’ll 2h4444 through the schematics and the theory book tommorow at work and try to get you a more definitive answer. Posted June 3, We want to use it in a V application.

If we take 3mA to be very safe, the voltages balance out but we have to live with the high leakage current through the load, which may be a problem for the application. PDF This gives you the basic idea, but there are other problem issues not mentioned here. We need to create a additional leakage path greater that the worst leakage spec in order to balance the voltages. A single device with this type of holdoff is really expensive, so I’m looking for an alternative solution.


Power Electronics Search In. I have a project coming up where I need to hold off about volts using an SCR. Sign In Sign Up.

2N Thyristors / Triacs – 5 in stock to buy, photo, pdf datasheet, rfq, obsolete

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Years ago, I read or heard of someone putting two SCR’s in series to achieve higher voltage rating. Posted June 4, Let’s look at a typical hookup using two 2N’s in series. We connect it as shown in the first diagram, but find that 2n44444 load turns on when we connect the power, even with no trigger applied.

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Posted June 6, Also note that we will be generating a fair amount of heat in the balancing resistors as shown on the wattmeter. We can see that D1 with the lowest leakage will have more than its rated V over it. You need to be a member in order to leave a comment. Sign in Already have an account? By stanyJune 3, datazheet Power Electronics.

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Look at this AP-note http: Hey guys, I’m a new member to this forum, so I have no idea if this topic has arisen before. In the diagram I used a leakage for 10uA for the one and about 20uA for the other. Already 2n444 an account? This will cause voltage breakdown of D1, followed by breakdown of D2.

2N4444 Datasheet

Share 2b4444 post Link to post Share on other sites. The problem is the leakage current that may vary from 10uA at a cold junction temperature to 2mA for a hot junction.

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From what I have seen they use pulse transformers to trig from a lower voltage to achieve simultaneous response.