TPS2031: Overcurrent output

Olivier Pairiot

Part Number: TPS2031

Hi all,

I've developed a USB port protection circuit that completely blocks the power supply when an overcurrent occurs. This circuit uses a TPS2031P which already protects the power supply alone, but in addition I use the OC output of the TPS2031P to control my blocking system. But I have a problem; when I short the output of the TPS2031P and ground, the output doesn't (almost) react, it drops a few hundredths of a Volt when it is used with its pull-up resistance, yet the circuit protects the power supply well. I first tried "on charge" (control of a transistor) then "on empty" (just by measuring with a multimeter), but nothing changes. I also tried adding an RC filter as shown in the datasheet but no difference either.

Can you help me ?

Thank you

PS: It is not a circuit that's defective because I tried with 3 different

over 4 years ago

0 Ziv Zhang over 4 years ago

TI__Mastermind 18031 points

Will reply to you soon.

0 Ziv Zhang over 4 years ago

TI__Mastermind 18031 points

Hi Sir,

Do you mean you short output to GND and measure OC pin? And the OC pin still in high status and not pulled down?

Can you send your schematic to me for a review?

And you can also try to change one new IC to have a test again.

Remember to measure the OC pin voltage.

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 Olivier Pairiot over 4 years ago in reply to Ziv Zhang

Prodigy 50 points

Hi,

Thanks for responding and sorry if my english is bad.

Yes, that's what I was trying to say.

I send you my schematic later because it's not possible now.

And I don't think it's one of circuit have a problem because I tried with 3 differents.

Thank you

0 Olivier Pairiot over 4 years ago in reply to Ziv Zhang

Prodigy 50 points

Hi,

This is the schematic of the circuit.

Thank you

0 Ziv Zhang over 4 years ago in reply to Olivier Pairiot

TI__Mastermind 18031 points

Hi Sir,

You can refer to the following EVM set up to set you bench.

If the IC works well, then you can debug your protection circuit.

http://www.ti.com/lit/ug/slvu226b/slvu226b.pdf

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 Olivier Pairiot over 4 years ago in reply to Ziv Zhang

Prodigy 50 points

Hi,

I'd try this schematic in the evening.

And what do you think about my schematic ?

Thank you

0 Olivier Pairiot over 4 years ago in reply to Ziv Zhang

Prodigy 50 points

Hi,

I tried the schematic of your datasheet (no more problems). Then I tested one more times my circuit and I noted the short circuit don't comes to TPS2031P. The short circuit is absorbed certainly by the transistor Q2.

So the TPS2031P circuit works well. The problem comes to my circuit.

Thank you very much for your responses

0 Ziv Zhang over 4 years ago in reply to Olivier Pairiot

TI__Mastermind 18031 points

That's fine.

Please help click 'resolved' button.

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TPS2031: Overcurrent output