TPS65987D: TPS65987DDH - About Over Current Clamp Firmware Selectable Settings(IOCC)

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Guru 21045 points

Part Number: TPS65987D
Other Parts Discussed in Thread: TPS65988

Hi Team,

Can I read/write IOCC value?

If yes, could you please let us know the Method?

Regards,

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over 4 years ago

0 Emma Hoying over 4 years ago

TI__Genius 9630 points

Hello,

This is captured well in the app note:

Please let me know if you have any questions.

Thanks,

Emma

0 Hide over 4 years ago in reply to Emma Hoying

Guru 21045 points

Hi Emma-san,

Thank you for your prompt reply and information.

Regards,

Hide

0 Emma Hoying over 4 years ago in reply to Hide

TI__Genius 9630 points

Happy to help!

Emma

0 Hide over 4 years ago in reply to Emma Hoying

Guru 21045 points

Hi Emma-san,

We are evaluating TPS65987DDH at the following.

Then, TPS65987DDH source board can supply 5V/1.8A.

[Source capability setting]

Maximum current =3A

Voltage =5V

Peak current=200%

[Sink capability setting]

Maximum current=0.9A

Voltage=5V

My understanding is as follows.

Is my understanding correct?

-If Source capability is 5V/3A, peak current 100% and Sink capability is 5V/0.9A, source board can supply 5V/0.9A.

-If Source capability is 5V/3A peak current is 200% and Sink capability is 5V/0.9A source board can supply 5V/1.8A(0.9 * 2).

So, peak current setting affects the actual current.

Regards,

Hide

0 Emma Hoying over 4 years ago in reply to Hide

TI__Genius 9630 points

Hi Hide-san,

The peak current only adjusts the overcurrent protection (OCP) also called the overcurrent clamp point. It will not affect the source or sink capabilities. Peak current setting does not affect actual current setting.

Thanks,

Emma

0 Hide over 4 years ago in reply to Emma Hoying

Guru 21045 points

Hi Emma-san,

Thank you for your prompt reply.

If Source capability is 5V/3A peak current is 200% and Sink capability is 5V/0.9A, which is "IOCC=around 6A" or "IOCC=around 1.8A"?

Regards,

Hide

0 Emma Hoying over 4 years ago in reply to Hide

TI__Genius 9630 points

Hi Hide-san,

Is the TPS65988 the source or the sink in this scenario? The Iocc is only enabled while the TPS65988 is acting as a source.

Thanks,

Emma

0 Hide over 4 years ago in reply to Emma Hoying

Guru 21045 points

Hi Emma-san,

Device is TPS65987DDH and source side.

Regards,

Hide

0 Emma Hoying over 4 years ago in reply to Hide

TI__Genius 9630 points

Hi Hide,

To answer your question:

If Source capability is 5V/3A peak current is 200% and Sink capability is 5V/0.9A, which is "IOCC=around 6A" or "IOCC=around 1.8A"?

IOCC = 6A in this case. The IOCC setting applies to the source. 200% of the source capability current would be 6A here.

Thanks,

Emma

0 Hide over 4 years ago in reply to Emma Hoying

Guru 21045 points

Hi Emma-san,

Thank you for your response.

Regards,

Hide

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TPS65987D: TPS65987DDH - About Over Current Clamp Firmware Selectable Settings(IOCC)