UC2827-1： The high speed optocouoler feedback

Chun Hung Chen

Part Number: UC2827-1

Hi TI team

I design the buck push-pull converter @ 400kHz. (PWM SWITCHING)

I'd like to select an optocoupler to isolate the feedback signal.

Do you have any advice?

Thanks

0 John Griffin1 over 4 years ago

The HS817B is a good choice.

Data sheet located here.

Regards

John

0 Chun Hung Chen over 4 years ago in reply to John Griffin1

Hi John

The Cut-off frequency may be too low.

110kHz

How do you think?

Thanks

0 John Griffin1 over 4 years ago in reply to Chun Hung Chen

Hi,

Your switching frequency is 400kHz so you should expect to achieve a loop bandwidth of 20kHz to 40kHz.

This is a achievable with the device I suggested.

Regards

John

Power management forum