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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Menu Ucc2842 through millions of questions and answers User. 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.
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Mar 10, 3: Hello Sulyn, I have a few thoughts about this, although not a definitive answer. Best regards, Sulyn Zhang.
More detailed schematic as below for your check: This seems to be a long on-time for a protection condition. I’ll try to respond as soon as I can. It seems to me that 2W is a lot of additional standby power that the R-C snubber alone wouldn’t account for. So based on above information and description, can you or anyone give a available solution to realize Hiccup mode with our UC?
Mar 10, 1: In reply to Ulrich Goerke:.
If so, that is what customer wanted! Mentions Tags More Cancel.
ST Microelectronics – datasheet pdf
Ask a new question Ask a new question Cancel. This can allow a smaller R-C snubber to be used at AUX to dampen the remaining ringing and reduce standby power. If you have further questions related to this thread, you may click “Ask a related question” below.
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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 uc284 and allowing a high primary peak current during the short condition. Please consider this investigation as another option to solve the main problem to achieve hiccup mode.
Hello Sulyn, It is an interesting problem; the AUX voltage is actually a little higher during short-circuit conditions than when normal. Mar 12, 7: More detailed schematic as below for your check:. If you have a related question, please click the ” Ask a related question ” button in the top right corner.
Repairing Switching Mode Power Supplies | audioXpress
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 have a solution to offer their advice on this matter.
From high voltage, this might account for the extra power. Ask a related question Ask a new question. Maybe that will snub the excess ringing, but D2 will block any hc2842 on uv2842 Vaux rail and T1 will stay off.
UC2842: How to realize Hiccup mode by using UC2842 in fly-back topology?
The newly created question will be automatically linked to this question. Uuc2842 simple the solution the better, thanks a lot! Your customer can test this idea 2 ways: