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UC3842A: UC3842AN

Part Number: UC3842A

I have a power CCA from a piece of equipment for a 8 channel power supply of 450VDC and we are running into a wall. With the UC3842AN in the circuit, we looked up a few applications for this component, came across one that looked like it was beefed up to allow a 450VDC output on the top half of the output, and a -450VDC coming from the bottom half. We got it to start to even out with 484VDC output, but it doesn't was to go any lower than what it is now. If anyone has a idea of what it could possible me, please let us know what you all thinks the issue is that isn't allowing the voltage to drop to where it needs to be for the output, please?

  • David,

    Thanks for your interest in TI here.

    If you wouldn't mind, I have a few questions to help me better understand your concerns.

    1) Can you share any schematic design details to give a better picture of the circuit in question?

    2)!For the issue you are seeing, can you provide what the input and output conditions and more details on what happens during the issue and if it ever works in other conditions?

    3) where did this design come from? Who made it? A TI reference design/evm, or some other source?



  • I will have to share with you what I have, because of the copy write's in place for the equipment it comes from. To be safe, I would have to have a one on one chat off the forums to show what I have.

    Also, while I was waiting for a response I came across the problem that was on the CCA that fixed it complete I believe. But I would still have to have a one on one chat to verify if it is complete to be sure. If you need my email I can proved it to you if needed.
  • David,

    Thanks for the update. I'm glad to hear you may have solved your issues. 

    If you can send any electrical schematic, layout, BOM(components list), and waveforms and descriptions of the failure in much more detail please go ahead and email me at

    I will consider this post closed for now.