UCC28220: SECONDARY CONTROLLED TWO-SWITCH FORWARD CONVERTER Design

younghyun kim

Part Number: UCC28220
Other Parts Discussed in Thread: TL431, TL432

UCC28220.

I want to know how to use UCC28220 for Secondary controlled PWM IC. (UCC28220 must be designed on the secondary side and the feedback must be connected directly at output voltage)

Thank you.

over 1 year ago

0 Hong Huang over 1 year ago

TI__Guru 53275 points

Hi,

Please provide your circuit idea in drawing how your circuit looks like then I can help to modify to substitute the opto coupler with a bipolar transistor, so you can still use an opto coupler to close your feedback loop first in your circuit idea drawing. Also note the ic needed external error op amp so you still need TL431 or an op amp in your design.

After received your circuit drawing i can help to change it to without the opto coupler.

0 younghyun kim over 1 year ago in reply to Hong Huang

Prodigy 50 points

03 MAIN DC-DC CONVERTER BLOCK.pdf

Hi. Thanks for your reply.

I share the circuit diagram I designed.

I applied UCC28220 for Secondary, TL432.

Thank you.

0 Hong Huang over 1 year ago in reply to younghyun kim

TI__Guru 53275 points

Hi,

Ok, the feedback circuit looks ok to me. As it looks you are all set so I am closing this thread.

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UCC28220: SECONDARY CONTROLLED TWO-SWITCH FORWARD CONVERTER Design