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BTW, not sure how other customer realize the protection feature? So based on above information and description, can you or anyone give a available solution to realize Hiccup mode with our UC?
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: No license, either express or implied, by estoppel or otherwise, is granted by TI.
In reply to Ulrich Goerke:. I’ll try to respond as soon as I can. 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. We are glad that we were able to resolve this issue, and will now uc28442 to close this thread.
However, the reality is cruel If so, that is what customer wanted! Best regards, Sulyn Zhang. In reply to Ulrich Goerke: More detailed schematic as below for your check:.
Mar 10, 3: However the standby current will increase about 2W which can’t be accepted by customer. If you have a related question, please click the ” Ask a related question ” button in the top right corner.
Mar 10, 8: Ask a related question Ask a new question. Hello Sulyn, It is an interesting problem; the AUX voltage is actually a little higher during short-circuit conditions than when normal. Do you have another question? 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 uc22842 right.
Do you have something that can share with me, thanks a lot!
Go to Support forums. Regards, Ulrich Locked Cancel Do you have another question?
Hi Ulrich, Thanks a lot for your support, I will let Customer try this idea and feedback to you. 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, uc284, 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, uuc2842 it seems Vaux is not pulled down.
The simple the solution the better, thanks a lot!
This thread has been locked. Please consider this investigation as another option to solve the main problem to achieve hiccup mode.
Below are two waveform with normal load status and 5V output load shorted to GND: Meanwhile, since this is an industry-wide uc842, 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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Ask uc242 related question What is a related question? It seems to me that 2W is a lot of additional standby power that the R-C snubber alone wouldn’t account for. If this filter can be made smaller, the Ipk will be lower and maybe the leakage inductance ringing will be smaller, too. 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.
This seems to be a long on-time for a protection condition. Content on this site may contain or be subject to specific guidelines or limitations on use. All content and materials on this site are provided “as is”.