TPS2042B: TPS2042B hot plug

Eric Shen42

Part Number: TPS2042B

Dear Team:
My customer used TPS2042B for USB port, they are worried that surge voltage will damage TPS2042B when hot-plugging USB, so they want to add another TVS at PIN 6 and 7. How to choose the clamping voltage of this TVS?

Thanks!

over 6 years ago

0 Eric Shen42 over 6 years ago

Expert 2750 points

Hi Team:
Sorry, can TI provide the anti-surge capability of PIN6 and PIN7?

Thanks!

0 Michael Tan over 6 years ago in reply to Eric Shen42

TI__Expert 8420 points

Hi ,

Thanks for your question we will reply you soon .

0 Ziv Zhang over 6 years ago in reply to Eric Shen42

TI__Mastermind 18031 points

Hi,

Please see page33.

For hot-plugging, will generate high surge current.

You can increase the output cap to suppress the surge.

For USB application, with USB2.0 spec, 120uF electrolytic capacitor is needed.

You can also refer to Figure42 of datasheet.

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 Eric Shen42 over 6 years ago in reply to Ziv Zhang

Expert 2750 points

Hi Ziv:

If customer want to add TVS, what clamping voltage is recommended?

Thanks!

Regards!

Eric

0 Ziv Zhang over 6 years ago in reply to Eric Shen42

TI__Mastermind 18031 points

Hi sir,

I am out of office and also need to have a check about the ABS.

Will reply to you tomorrow.

Thanks.

Ziv

0 Ziv Zhang over 6 years ago in reply to Eric Shen42

TI__Mastermind 18031 points

Hi Eric,

Please refer to the following link.

http://www.ti.com/lit/an/slvae37/slvae37.pdf

The clamp voltage selection is according to your application scenario.

The above link has explained it in details.

In general, VRWM is close to the Maximum value of normal operation. VBR is below ABS value.

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.

Ziv

Power management

Power management forum

TPS2042B: TPS2042B hot plug