TPS25730EVM: Operation under /FAULT_IN=Low

Koshi Ninomiya

Part Number: TPS25730EVM

Tool/software:

Dear Team,

While VBUS votlage is available at Type-C Receptable, but VIN_3V3 is not available and the TPS25730D operates the dead-battery mode, when /FAULT_IN pin of the TPS25730D is set Low by prssing SW5 (Rev.A1 EVM) / SW1 (Rev.A2 EVM ?) continuously, what operation does the TPS25730D do?

We thoought that the TPS25730D keeps disconncting power-path (VBUS_IN to PPHV) under /FAULT_IN=Low. However, according to my customer, the TPS25730D continuously disconnects and restarts under /FAULT=Low.

When /FAULT_IN is set Low, is Internal 3.3V LDO, LDO_3V3, disabled too? Since the LDO_3V3 is lost under /FAULT_IN=Low, does the TPS25730D continuously disconnect and restart?

When /FAULT_IN is set Low, what functions of the TPS25730D will be disabled?

Best Regards,

Koshi Ninomiya

over 1 year ago

0 Field Tolson over 1 year ago

TI__Genius 10772 points

Hi Koshi,

Due to the holiday in the US, many of the device experts are currently out of the office. When they return they will look into this and provide a response. Please expect some delay accordingly.

Thanks,
Field

0 Koshi Ninomiya over 1 year ago in reply to Field Tolson

TI__Expert 5425 points

Dear Team,

I got a capture shot from my customer as below,

When /FAULT_IN is set Low, what functions of the TPS25730D will be disabled?
And what operation will the TPS25730D do without VIN_3V3?

Best Regards,

Koshi Ninomiya

0 Kevin Kosta over 1 year ago in reply to Koshi Ninomiya

TI__Genius 17945 points

Hi,

Thanks for reaching out on E2E.

Give me some time to get back to you.

Thank you,

Kevin

0 Kevin Kosta over 1 year ago in reply to Kevin Kosta

TI__Genius 17945 points

Hi,

Koshi Ninomiya said:
When /FAULT_IN is set Low, what functions of the TPS25730D will be disabled?
And what operation will the TPS25730D do without VIN_3V3?

When the FAULT_IN is triggered, we will disconnect VBUS and there will be a disconnect command at the port. As for the VBUS coming up, in addition to the scope capture can you get a PD log?

Thank you,

Kevin

0 Koshi Ninomiya over 1 year ago in reply to Kevin Kosta

TI__Expert 5425 points

Hi Kevin-san,

When the /FAULT_IN is triggered, /FAULT_IN=Low, will the interna LDO from VBUS to LDO_3V3 be disabled? Then, the /FAULT_IN trigger is reset?

Best Regards,

Koshi Ninomiya

0 Kevin Kosta over 1 year ago in reply to Koshi Ninomiya

TI__Genius 17945 points

Hi Koshi,

I think that is correct! I am not sure if the behavior of the reconnect is true. Can you please share the schematic with me?

This is a public forum so please share it to me over Email or Webex.

Thank you,

Kevin

0 Koshi Ninomiya over 1 year ago in reply to Kevin Kosta

TI__Expert 5425 points

Hi Kevin-san,

My customer uses the TPS25730EVM.

I really want you to confirm the behavior of Power Supplies.
And I really want you to confirm,
When /FAULT_IN is set Low, what functions of the TPS25730D will be disabled?
And what operation will the TPS25730D do without VIN_3V3?

Best Regards,

Koshi Ninomiya

+1 Kevin Kosta over 1 year ago in reply to Koshi Ninomiya

TI__Genius 17945 points

Hi Koshi-san,

Koshi Ninomiya said:
When /FAULT_IN is set Low, what functions of the TPS25730D will be disabled?

Charging and PD negotiations are disabled.

Koshi Ninomiya said:
And what operation will the TPS25730D do without VIN_3V3?

If there is no VBUS present, the device would be powered off and disabled.

Thank you,

Kevin

Power management

Power management forum

TPS25730EVM: Operation under /FAULT_IN=Low