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We can see that D1 with the lowest leakage will have more than its rated V 2b4444 it. By stanyJune 3, in Power Electronics.
2N4444 – SCR, V(DRM) = 600V TO 699.9V
We need to create a additional leakage path greater that the worst leakage spec in order to balance the voltages. Register a new account.
Posted June 4, Power Electronics Search In. Let’s look at a typical hookup using two 2N’s in series. Years ago, I read or heard of someone putting two SCR’s in series to achieve higher voltage rating. We connect it as shown in the first diagram, but find that the load turns on when we connect the power, even with no trigger applied.
Off my head, I cant just ramble out the way it works, but I’ll look through the schematics and the theory dattasheet tommorow at work and try to get you a more definitive answer. Share this post Link to post Share on other sites. A single device with this type of holdoff is really expensive, so I’m looking for an alternative solution.
Datasheet Page 88, pdf datasheet & application note
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. 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. Already have an account? Posted June 6, Look at this AP-note http: Posted June 3, In the diagram I used a leakage for 10uA for the one and about 20uA for the other.
Sign In Sign Up. From what I have seen they use pulse transformers to trig from datasheey lower voltage to achieve simultaneous response.
This will cause voltage breakdown of D1, followed by breakdown of D2.
2N_PDF Datasheet Download IC-ON-LINE
Anyone out there with any experience in this application??? I have a project coming up where I need to hold off about volts using an SCR. PDF This gives you the basic idea, but there are other problem issues not mentioned here.
We want to use it in a V application. 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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Also note that we will be generating a ddatasheet amount of heat in the balancing resistors as shown on the wattmeter. Sign in Already have an account? Hey guys, I’m a new member to this forum, so I have no idea if this topic has arisen before. You need to be a member in order to leave a comment.