Hi Claire,
I was trying to probe the points we discussed but unfortunately I couldn't probe when the issue occurs since the power supply immediately goes normal soon after I touch VS pin either with DMM or DSO probes or any metal objects.
However…
Part Number: UCC28702 Other Parts Discussed in Thread: UCC28700 Hi Eric,
We redesigned our transformer and the basic functionality of circuit is working fine.
We tested entire input range from 85 to 305V AC and current from 250mA to 1A and is working perfectly…
Part Number: UCC28702 Other Parts Discussed in Thread: UCC28700EVM-068 Hi,
we are facing issue with UCC28702 design. Design is taken form WEBBENCH.
Unable to switching ON the power supply. the VDD pin of UC28702 is pulsating in between 21V to 8V.
Unable…
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…
Other Parts Discussed in Thread: TL431 Hello,
I would like to choose an isolated AC/DC flyback controller IC which would be best suitable to get 3.3V, and up to 3A output. It should be low cost (<0.5$)as it will be used in mass production.
First, I…
Other Parts Discussed in Thread: UCC28700 , UCC28703 , TPS54060 , UCC28704 , UCC28702 , UCC28701 Hi, I'm looking for a cheap solution to get 3.3V or 5V and about 30mA directly from the line, prefarably in an all-SMD solution.
I need both, for different…
Other Parts Discussed in Thread: UCC28700EVM-068 Hi,
Now I'm promoting the UCC2870x that is controller with primary-side regulation to our customer. Then they are asking about accuracy of voltage regulation. In UCC28700EVM-068, it state min/max of Vout…
Other Parts Discussed in Thread: UCC28720 Dear TI people, Regarding the parameters tON(min) and tDMAG(min). For the UCC28720 a tON(min) specification is given of 300 ns and tDMAG(min) of 1.2 us. My first question is: Does the calculated value for tON(min…