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BQ25758：PPS Constant Current Function

?? ?

Prodigy 40 points

Part Number: BQ25758

Tool/software:

Hi ,

When using BQ25758 for PPS 21V @5A output, E-Loader Set CV Mode, when CV is set to 20V, BQ25758 will trigger VAC UVP.

How to implement the PPS Constant Current function?

ACUV has been Shorted to PGND.

0 ?? ? 11 months ago

Prodigy 40 points

Added test waveform

0 Jing Zou 11 months ago in reply to ?? ?

TI__Mastermind 20570 points

Hi,

Are you testing on the EVM board? If not, Can you please share your schematic?

0 ?? ? 11 months ago in reply to Jing Zou

Prodigy 40 points

Hi,

Testing for EVB Board。 But I shorted ACUV to PGND.

0 ?? ? 11 months ago in reply to Jing Zou

Prodigy 40 points

Hi,

Testing for EVB Board。 But I shorted ACUV to PGND.

0 ?? ? 11 months ago in reply to Jing Zou

Prodigy 40 points

Hi,

Testing for EVB Board。 But I shorted ACUV to PGND.

0 ?? ? 11 months ago in reply to Jing Zou

Prodigy 40 points

Hi,

Testing for EVB Board。 But I shorted ACUV to PGND.

0 ?? ? 11 months ago in reply to Jing Zou

Prodigy 40 points

Hi,

Testing for EVB Board。 But I shorted ACUV to PGND.

+1 ?? ? 11 months ago in reply to Jing Zou

Prodigy 40 points

Hi,

Testing for EVB Board。 But I shorted ACUV to PGND.

0 Christian Moyer 11 months ago in reply to ?? ?

TI__Mastermind 36026 points

Hello,

Why did you short ACUV to PGND? if you do not what the ACUV feature you need to pull it up to VAC:

Best Regards,

Christian.

0 ?? ? 11 months ago in reply to Christian Moyer

Prodigy 40 points

Hi Christian,

Sorry, I said it wrong. I shorted ACUV to VAC.

ACOV shorted to PGND.

0 Ethan Galloway 11 months ago in reply to ?? ?

TI__Mastermind 32395 points

Hello,

I've got a few questions to help debug this. Are you using a USB-PD controller? Has the VAC_DPM register been changed?

Also, is the VAC_UVP flag only outputted at these specific voltages or is the flag outputted at all voltages?

Best Regards,
Ethan Galloway