TUSB4020BI: 1.1V Ferrite Bead

Youngjin Choi

Part Number: TUSB4020BI

Tool/software:

Hello.

I'm trying to supply 1.1V using TPS74611 to the 1.1V rail of TUSB4020BI.

The data sheet of TUSB4020BI says that ferrite beads are recommended to remove noise, but I would like to ask if there will be no problem.

For your information, 1.1V is used only to supply to TUSB4020BI, and I'm trying to use BLM18SG221TZ1D for ferrite beads.

Please let me know your opinions.

0 Brian Zhou 20 days ago

Hi Youngjin;

I did recommend to add ferrite on 1.1v supply since you don't know how noisy the system is. BLM18SG221TZ1D should work.

Best

Brian

0 Youngjin Choi 19 days ago in reply to Brian Zhou

Thank you for your answer, Brian.

I think noise can be removed enough with a capacitor.

Are ferrite beads necessary? Will there be other problems, such as making new noises?

+1 Brian Zhou 19 days ago in reply to Youngjin Choi

If you believe suppply noise on your system can be controlled, then Ferrite is not necessary,

Best

Brian

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