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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We are glad that we were able to resolve this issue, and will now proceed to close this thread. 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.

UC2842: How to realize Hiccup mode by using UC2842 in fly-back topology?

Ask a related question What is a related question? Mar 10, 3: This can allow a smaller R-C snubber to be used at AUX to dampen the remaining ringing and reduce standby power.

Go to Support forums. Regards, Ulrich Locked Cancel Do you have another question? 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.

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.

ST Microelectronics – datasheet pdf

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I’ll try to respond as soon as I can. This thread has been locked. In reply to Ulrich Goerke:. Use of the information on this site may require a license from a third party, or a license from TI. TI is a global semiconductor design and manufacturing company.

However the standby current will increase about 2W which can’t be accepted by customer. Ask a related question Ask a new question.

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Your customer can test this idea 2 ways: More detailed schematic as below for your check:. Mar 10, 1: Hello Sulyn, I have a few thoughts about this, although not a definitive answer. The simple the solution the better, thanks a lot!

Best regards, Sulyn Zhang. So based on above information and description, can you or anyone give a available solution to realize Hiccup mode with our UC?

Menu Search through millions of questions and answers User. 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. Mar 10, 8: If this filter can be made smaller, the Ipk will be lower and maybe the leakage inductance ringing will be smaller, too.

Hello Sulyn, It is an interesting problem; the AUX voltage is actually a little higher during short-circuit conditions than when normal.


I suspect that the current sense R-C filter is delaying the peak signal too long and allowing a high primary peak current uf2842 the short condition. 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.

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If you have further questions related to this thread, you may click “Ask a related question” below. Hi Ulrich, Thanks a lot for your support, I will let Customer try this idea and feedback to uc242. BTW, not sure how other customer realize the protection feature?

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