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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If this filter can be made smaller, the Ipk will be lower and maybe the leakage inductance ringing will be smaller, too. Meanwhile, since this is an industry-wide forum, I invite other viewers, inside and outside of TI, who may already jc2842 a solution to offer their advice on this matter.
It seems to me that 2W is a lot of additional standby power that the R-C snubber alone wouldn’t account for. 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.
Maybe that will snub the excess ringing, but D2 will block any drop on the Vaux rail and T1 will stay off.
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.
Repairing Switching Mode Power Supplies | audioXpress
We are uc28842 that we were able to resolve this issue, and will now proceed to close this thread. Do you have something that can share with me, thanks a lot!
ST Microelectronics – datasheet pdf
No license, either express or implied, by estoppel or otherwise, is granted by TI. However, the reality is cruel This seems to be a long on-time for a protection condition. Mar 10, 8: Ask a related question Ask a new question. Mar 12, 7: Hi Ulrich, Thanks a lot for your support, I will let Customer try this idea and feedback to you.
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If you have a related question, please click the ” Ask a related question ” button in the top right corner. Hello Sulyn, I have a few thoughts about this, although not a definitive answer. BTW, not sure how other customer realize the protection feature? 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.
If so, that is what customer wanted! Hello Sulyn, It is an interesting problem; the AUX voltage is actually a little higher during short-circuit conditions than uc282 normal. I’ll try to respond as soon as I can. TI, its suppliers and providers of content reserve the right to make corrections, deletions, modifications, enhancements, improvements ud2842 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.
Use of the information on this site may require a license from a third party, or a license from TI. In reply to Ulrich Goerke: Mar 10, 3: More detailed schematic as below for your check:.
The simple the solution the better, thanks a lot! I do not have an immediate answer, but I will think about this and discuss it with colleagues. The newly created question will be automatically linked to this question.