TPS2561: Reverse Current from Bus Side / USB Bus Surge

RWE

Part Number: TPS2561

Dear Support,

Our customer wants to use the TPS2561 as high side switch to power two USB 3.0 Ports. I found out that the device protects against reverse current in off-mode.

But now I have two questions:

1. Is it common / recommended to protect USB power switches against reverse current in active mode; speaking of a surge from bus side? If yes: Are there USB high side switches with this functionality or would our customer need a smart high side switch?

2. Is there a meaning after the last letter in the GPN (like TPS20xxC or TPS20xxD) other than the version number?

Thank you in advance and best regards

over 5 years ago

0 Ziv Zhang over 5 years ago

TI__Mastermind 18031 points

Hi Sir,

1. TPS2561 doesn't have the reverse current blocking function as power on.

Only can block the reverse voltage as IC is disabled.

2. C version and D version is only minor difference with craft. The function is almost the same.

For TI's policy, I will first click resolved button.

If you have any other concern, contact me any time.

If you think resolved, please help click 'Issue is solved button'.

Thanks.

0 RWE over 5 years ago in reply to Ziv Zhang

TI__Intellectual 1155 points

Hi Ziv,

Thank you for the quick answer!

As the TPS2561 has no reverse current blocking when powered on, would you recommend to protect it with discrete components against reverse current? For example when a connected electronic is generating an over voltage for a short time? If there is a standard protection circuit would you please provide some information about it?

0 Ziv Zhang over 5 years ago in reply to RWE

TI__Mastermind 18031 points

Hi sir,

How long time about the reverse current is allowed?

For further, email me a0224015@ti.com.