TPS65982: VBUS Bead Requirement

Jim CHEN

Expert 4795 points

Part Number: TPS65982

Dear Team,

May I know what is the function of the bead in below figure?

Why I need this bead on VBUS?

over 7 years ago

0 Jacob Ontiveros over 7 years ago

TI__Expert 6280 points

[deleted]

0 Atiq Rahman over 7 years ago

TI__Expert 5110 points

Just to add couple additional notes, Inductor on VBUS line helps limiting the current and hence minimizes inrush. In addition it also helps reducing unwanted noise and ringing on VBUS thus improves EMI.

Regards,
Atiq

0 user5310907 over 7 years ago in reply to Atiq Rahman

Prodigy 20 points

As I know, the chip can limit the current by fw. Why we need adding a bead on VBUS?
As you said, if EMI test pass,we can remove the bead,right?

0 user5310907 over 7 years ago in reply to Jacob Ontiveros

Prodigy 20 points

The chip have no ESD protect,so need external bead for ESD right?

0 Jim CHEN over 7 years ago in reply to user5310907

TI__Expert 4795 points

Hi user5310907,

TPS65982 does have ESD protection as below.

Interface

Interface forum

TPS65982: VBUS Bead Requirement