Other Parts Discussed in Thread: UCC28720 Hi,
I received the following question from my customer.
There is the R4 on the figure 30 of the datasheet.
Is this resistor for VDD filter?
Could you show me how to calculate this resistor?
Best Regards…
Jonathan,
The transformer drawing describes how to construct the transformer yes.
As you can see from the schematic the input voltage is rectified to DC by D1, so the voltage applied to the transformer is not the AC line voltage. Also the output…
Dear TI people,
I'm still stuck on this issue. I'm thinking about an approach to increase my changes to get some help on this. So how about this one:
As the UCC28720 is a device designed for minimal no load consumption, Low cost, minimal BOM count…
Other Parts Discussed in Thread: UCC28720 , UCC28722 Hi,
I would like to know if I could use UCC28720 controller instead of UCC28722 in the "6W USB Charger Reference Design" (www.ti.com/tool/PMP9088).
I know they are not pinout and package compatibles…
Why there is this discussion?
There are so many questions in the forum related to the startup of UCC2870X or other TI PSR controllers/switchers. We know the anxiety when customer met startup issues. So we develop to try to aim customer on their issues…
Part Number: UCC28720EVM-212 Other Parts Discussed in Thread: UCC28720 Hi ,
I know that the UCC28720 can achieve a 5W charger design without Y capacitor. under easily passing EMI test (Application Report Number ZHCA597), I want to know, if output changed…
Part Number: UCC28720EVM-212 Other Parts Discussed in Thread: UCC28712 , , UCC28720 Hi team,
Can the board design of UCC28720EVM-212 be applied for evaluating UCC2871x (such as UCC28712) because those 2 parts are replaced with pin-to-pin? I assume some…
Hi IgorR
Thank you for reaching out.
The IC is most likely restarting because it has encountered a fault.
Please refer the following debug guides which might be helpful with the debug process.
https://e2e.ti.com/support/power-management-group…
Hello BR,
The UCC28722 is the same device as the UCC28720 and does not have the internal high voltage startup.
You would use trickle charge resistors to charge up the VDD capcitor.
However, it you want to use the UCC28720 you could use a series…
Hi, Sergey
UCC28720 is not recommended to support two output rails in parallel.
I recommend you to change the output voltage of UCC28720EVM to 12V and use Buck stage to achieve 5V from 12V. Then, you can get both 12V and 5V.
BR,
Yunsheng
