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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BTW, not sure how other customer realize the protection feature? This seems to be a long on-time for a protection condition. TI uc28422 a global semiconductor design and manufacturing company. We are glad 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! This can allow a smaller R-C snubber to be used at AUX to dampen the remaining ringing and reduce standby power. This thread has been locked. Maybe that will snub the excess ringing, but D2 will block any drop on the Vaux rail and T1 will stay off. If so, that is what customer wanted!

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Repairing Switching Mode Power Supplies | audioXpress

Best regards, Sulyn Zhang. 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 of Use of this site. Ask a related question What is a related question? The simple the solution the better, thanks a lot!

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Mar 10, 1: 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. So based on above information and description, can you or anyone give a available solution to realize Hiccup mode with our UC? Mar 10, 3: In reply to Ulrich Goerke:.

Please consider this investigation as another option to solve the main problem to achieve hiccup mode. If this filter can be made smaller, the Ipk will be lower and maybe the leakage inductance ringing will be smaller, too.

More detailed schematic as below for your check:. All content and materials on this site are provided “as is”. Hello Sulyn, It is an interesting problem; the AUX voltage is actually a little higher during short-circuit conditions than when normal. It seems to me that 2W is a lot of additional standby power that the R-C snubber alone wouldn’t account for.

Hello Sulyn, I have a few thoughts about this, although not a definitive answer. The newly created question will be automatically linked to this uf2842.


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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. However, the reality is cruel Hi Ulrich, Thanks a lot for your support, I will let Customer try this idea and feedback to you. Regards, Ulrich Locked Cancel Do you have another question? More uc242 schematic as below for your check: 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 ud2842 on this matter.

Content on this site may contain or be subject to specific guidelines or limitations on use. However the standby current will increase about 2W which can’t be accepted by customer.

Do you have another question? Below are two waveform with normal load status and 5V yc2842 load shorted to GND: No license, either express or implied, by estoppel or otherwise, is granted by TI. 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.