UC2842 PDF

UC/3/4/5. UC/3/4/5. October CURRENT MODE PWM ZED FOR OFF LINE AND DC TO DC. CONVERTERS. UC Switching Controllers are available at Mouser Electronics. Mouser offers inventory, pricing, & datasheets for UC Switching Controllers. Texas Instruments UC Series Switching Controllers are available at Mouser Electronics. Mouser offers inventory, pricing, & datasheets for Texas.

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I suspect that the current sense R-C filter is delaying the peak signal too long and allowing a high primary peak current during the short condition.

BTW, not sure how other customer realize the protection feature? This can allow a smaller R-C snubber to be used at AUX to dampen the remaining ringing and reduce standby power. Regards, Ulrich Locked Cancel Hc2842 you have another question?

Ask a related question Ask a new question. The simple the solution the better, thanks a lot! Mar 10, 8: This thread has been locked. Below are two waveform with normal load status and 5V output load shorted to GND: More detailed schematic as below for your check: Content on this site may contain or be uf2842 to specific guidelines or limitations on use. No license, either express or implied, by estoppel or otherwise, is granted by TI.

ST Microelectronics – datasheet pdf

Hello Sulyn, I have a few thoughts about this, although not a definitive answer. If you have further questions related to this thread, you may click “Ask a related question” below. Meanwhile, since this is an industry-wide forum, I invite other viewers, inside and outside of TI, who may already have a solution to offer their advice on this matter.

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I do not have an immediate answer, but I will think about this and discuss it with colleagues. All content and materials on this site are provided “as is”.

Repairing Switching Mode Power Supplies

However, the reality is cruel More detailed schematic as below for your check:. Do you have something that can share with me, thanks a lot! Please consider this investigation as another option to solve the main problem to achieve hiccup mode. Trademarks Privacy Policy Terms of Use.

Mar 12, 7: TI and its respective suppliers and providers of content make no representations about the suitability of these materials for any purpose and disclaim all warranties and conditions with regard to these materials, including but not limited to all implied warranties and conditions of merchantability, fitness for a particular purpose, title and non-infringement of any third party intellectual property right. We are glad that we were able to resolve this issue, uc28442 will now proceed to close this thread.

I suspect that putting the R-C across the AUX diode D2 allows it to briefly pull down the Vaux rail every switching cycle during normal mode and those perturbations might be triggering the start-up transistor T1 to briefly conduct each cycle.

If so, that is what customer wanted!

ST Microelectronics

Ask a related question What is a related question? In reply to Ulrich Goerke:. So based on above information and description, can you or anyone give a available solution to realize Hiccup mode with our UC? Hello Sulyn, It is yc2842 interesting problem; the AUX voltage is actually a little higher during short-circuit conditions than when normal. Menu Search through millions of questions and answers User.


All postings and use of the content on this site are subject to the Terms of Use of the site; third parties using this content agree to abide by any limitations or guidelines and to comply with the Terms uf2842 Use of this site. In reply to Ulrich Goerke: Maybe that will snub the excess ringing, but D2 will block any drop on the Vaux rail and T1 will stay off. The newly created question will be automatically linked to this question. Go to Support forums.

Repairing Switching Mode Power Supplies | audioXpress

I’ll try to respond as soon as I can. Mentions Tags More Cancel. If this filter can be made smaller, the Ipk will be lower and maybe the leakage inductance ringing will be smaller, too.

Use of the information on this site may require a license from a third party, or a license from TI. From high voltage, this might account for the extra power. Mar 10, 3: