Hi,
For typical application where input is 53VAC to 90AVC (60Vpk to 132Vpk) and output is 43VDC (300W design) , i am trying to design single stage LLC HF Bridge topology using UCC25600.
After reading LLC related blogs and looking at input voltage variation I need to consider Lm/Lr low 3 ~ 4 (?). But input to output voltage conversion at low line gives me transformer turns ratio n < 1 and at high line n > 1.
What could be the situation if n<1 and input is 90VAC (132Vpk)?
If I use voltage doubler, input voltage range will be very high (144V) and need to compromise with efficiency.
Or can I use simple capacitor and n<1 will work for input range variation?
Can any one suggest a possible way ?
Thanks
Rick
