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PDF This gives you the basic idea, but there are other problem issues not mentioned here. You need to be a member in order to leave a comment. We need to create a additional leakage path greater that the worst leakage spec in order to balance the voltages. Also note that we will be generating a fair amount of heat in the balancing resistors as shown on the wattmeter.

Posted June 4, Create an account or sign in to comment You need to be a member in order to leave a comment Create an account Sign up for a new account in our community.

2N Datasheet PDF –

Power Electronics Search In. We connect dagasheet as shown in the first diagram, but find that the load turns on when we connect the power, even with no trigger applied. Posted June 6, This will cause voltage breakdown of D1, followed by breakdown of D2. 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.


Let’s look at a typical hookup using two 2N’s in series. By stanyJune 3, in Power Electronics. Hey guys, I’m a new member to this forum, so I have no idea if this topic has arisen before. Register a new account.

2N4444 Datasheet

We want to use it in a V application. Already have an account?

Share this post Link to post Share on other sites. Look at this AP-note http: In the diagram I used a leakage for 10uA for the one and about 20uA for the other. A single device with this type of holdoff is really expensive, so I’m looking for an alternative solution.

Anyone out there with any experience in this application???

2N4444 View Datasheet(PDF) – Motorola => Freescale

Off my head, I cant just ramble out the way it works, but I’ll look through the schematics and the theory book tommorow at work and try to get you a more definitive answer. Sign In Sign Up. Sign up for a new account in our community. 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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I have a project coming up where I need to hold off about volts using an SCR. Years ago, I read or heard of someone putting two SCR’s in series to achieve higher voltage rating.

From what I have seen they use pulse transformers to trig from a lower voltage to achieve simultaneous response. Sign in Already have an account? Posted June 3, We can see that D1 with the lowest leakage will have more than its rated V over it.