Hi Lakwinder,
Yes, we have an Excel calculator tool for the UCC28740: https://www.ti.com/lit/zip/sluc487
On the "SCHEMATIC AND BoM" tab of the Excel file, the design parameters for the transformer are given.
thanks,
Brian
Hi Mayur,
Here are some simulation resources for the UCC2897A: https://www.ti.com/product/UCC2897A#design-tools-simulation
You may want to also consider a two-switch flyback. Here is a two-switch flyback reference design that is very close to your…
Hi Ashish,
If the CS pin voltage reaches the 0.48V (typical) level or 0.43V (min), it will initiate pulse-by-pulse current limit. The voltage on this pin is equal to the output current multiplied by the turns ratio of the power transformer (T1), the…
Hi,
You did an excellent job of summarizing the trade-offs for the two approaches. Type 1 is better performance, but requires extra windings on the transformer.
- If you require better regulation and lower loss, try to use Type 1. However, if you…
Hi Younes,
You would need to contact Wurth or another transformer supplier of your choice to have a new transformer created. This is should be fairly easy for them to accommodate. To add a second +15V/-8V output, you can simply add another secondary…
Hi Hayashi,
It won't really be linear, but the output voltage will continue to decrease. It will behave more like a constant power limit, since the input current is limited by the peak current limit and the input voltage is fixed.
thanks, Brian
Please see the following two designs that are much closer to your requirements.
If you want the PFC-flyback topology, PMP11155 is very close to your requirements. Simply add a secondary buck regulator for the 5V output, or get a new transformer with…
