Other Parts Discussed in Thread: UCC2897A
Hi,
I previously asked about UCC2894D in the following thread.
I would like to ask additional questions.
(question 1)
Is there any other documentation on the mechanism by which the primary switch overvoltages occur?
(Question 2)
In the answer to the previous question, it was stated that the appropriate soft stop time setting depends on the output capacitor and output voltage.
Specifically, is there a mathematical formula that quantitatively shows how the soft stop time is set at what voltage and how much capacitor capacity is?
(Question 3)
Is there any material that describes the difference between when the primary side main switch is overvoltage and when it is not?
(Question 4)
In the case of UCC2894D, is it okay to recognize that the soft stop continues to output both OUT and AUX, and the duty of OUT gradually decreases?
(Question 5)
I looked at the catalog of UCC2897.
The Line Undervoltage Protection section looks like the OUT pin is completely off.
In the UCC2894D catalog, it seems that DUTY is gradually changing for both OUT and AUX.
Is there any difference between UCC2897 and UCC2894 in the operation of soft-stop?
Best regards,