Other Parts Discussed in Thread: UCC3818, , UCC28019
Dear Team,
Here is Kevin from the Delta Taiwan team.
1. Why this PFC pre-controller doesn’t have Vin-sense and input current sense?
How does it achieve shaping input current without input voltage sensing?
From the previous design, there are input sense to multiple Imo to shape current, I have no idea how to shape current if without input voltage information.
2.What does the meaning of Reduced current sense threshold (minimizes power dissipation)?
Could you give me an example compared to UCC3818?
This function seems what we need to achieve high efficiency.
3.If I want to measure the loop gain of the demo board how to measure?
Please teach us how to measure open and close loop including current and voltage.
4. Could you teach us how to use Tina to simulate the UCC28180's bode plot?
Base on TI's website TINA circuit I can see the preliminary result.
a. I am not sure how to change the output resistance to achieve load transient test
b. How to check iTHD(even the simulation mention it have simulate iTHD)
c. How to test the bode plot
Customer would like to test below items:
(load transient , iTHD, Loop gain and phase)
BR
Kevin