UC28025 Half Bridge reference design

CW,

Attached is a paper on the half bridge topology using a UC2825 and current mode control.

In addition i noticed a couple of things that are probably impacting the circuit performance. The first is that there is a sneek path in the feedback loop that will result in a higher gain than designed and probably some instability as a result. this is explained in a paper you can find at the link:

http://www.controleng.com/index.php?id=483&cHash=081010&tx_ttnews%5btt_news%5d=68909

Because of the integrating nature of the feedback loop on the secondary side you might find that you run into Turn on Overshoot" which is discussed in the following paper:

http://www.powermanagementdesignline.com/howto/198701926;jsessionid=HFZHQJMW11G0LQE1GHPSKH4ATMY32JVN?pgno=1

And lastly the current mode controlled half bridge has a tendancy to go into oscillation due to imbalances and this and the solution is discussed in the following paper:

http://www.how2power.com/newsletters/1204/articles/H2PToday1204_design_TexasInstruments.pdf

Hope these comments help

Hi John,

Thank you very much for your help! I will read this during the weekend and make the adjustments as soon as possible!

I'll get back to you if I have any questions!

Kind regards

CWilson.

Hi John,

"Because of the integrating nature of the feedback loop on the secondary side you might find that you run into Turn on Overshoot" which is discussed in the following paper:

http://www.powermanagementdesignline.com/howto/198701926;jsessionid=HFZHQJMW11G0LQE1GHPSKH4ATMY32JVN?pgno=1"

Your link doesn't work..?

/Cwilson.

Try copying it directly into your browser

JB

Hi John,

Thank you. Very interesting reading. It works by copying it to the browser address bar.

Have a nice weekend.

/CWilson.