**Part Number:** UCC28881

**Tool/software:** WEBENCH® Design Tools

Hi guys,

this is my first post in this forum and I just joined the TI support network.

I'm trying to build a 230 V AC / 16 DC converter and to understand the

necessaray design I started to follow the equations mentioned in the

datasheet in chapter 9.

I already get stuck on page 18 calculating the CBULK value. I tried to

insert the values seen in table 2 in formular (2) and I can't reach the

resulting value of 15.6 µF mentioned on page 19.

Furthermore I do not understand the sentence on page 19:

"By using a full-wave rectifier allows a smaller capacitor for C1 and

C2, almost 50 % smaller." Using a full-wave rectifier would mean to

se for RCT a value of 2 instead of 1. The resulting capacity is almost

wice as bis as with a value of 1.

Can somebody help me on this? Since I'm not familiar with formular (2)

I'm not sure if I can trust calculated results when starting my own design.

BR,

Markus