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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Repairing Switching Mode Power Supplies

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. Ask a related question Ask a new question. 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 Uc284 of Use of this site.

If you have further questions related to this thread, you may click “Ask a related question” below. More detailed schematic as below for your check: The simple the solution the better, thanks a lot! In reply to Ulrich Goerke: No license, either express or implied, by estoppel or otherwise, is granted by TI.

ST Microelectronics – datasheet pdf

Best regards, Sulyn Zhang. Below are two waveform with normal load status and 5V output load shorted to GND: Mar 10, 8: This thread has been locked. BTW, not sure how other customer realize the protection feature?


Mar 10, 3: We are glad that we were able to resolve this issue, and will now proceed to close this thread. 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 ux2842.

However the standby current will increase about 2W which can’t be accepted by customer. TI is a global semiconductor design and manufacturing company. Trademarks Privacy Policy Terms of Use. Go to Support forums.

In reply to Ulrich Goerke:. Do you have another question?

Repairing Switching Mode Power Supplies | audioXpress

Do you have something that can share with me, thanks a lot! 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. Mentions Tags More Cancel. TI, its suppliers and providers of content reserve the right to make corrections, deletions, modifications, enhancements, improvements and other changes to the content and materials, its products, programs and services at any time or to move or discontinue any content, products, programs, or services without notice.

When we measure the output of auxiliary winding output voltage and Vaux, it seems the Vaux is not pulled down due to that these is leakage inductance, so it seems Vaux is not pulled down.

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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. Use of the information on this site may require a license from a third party, or a license from TI.

Your customer can test this idea 2 ways: This can allow a smaller R-C snubber to be used at AUX to dampen the remaining ringing and reduce standby power. Maybe that will snub the excess ringing, but D2 will block any drop on the Vaux rail and T1 will stay off. This seems to be a long on-time for a protection condition.

I’ll try to respond as soon as I can. Regards, Ulrich Locked Cancel Do you have another question? So based on above information and description, can you or anyone give a available solution to realize Hiccup mode kc2842 our UC?

I do not have an immediate answer, but I will think about this and discuss it with colleagues.

Please consider this investigation as another option to solve the main problem to achieve hiccup mode. Mar 10, 1: Ask a new question Ask a new question Cancel.

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