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BQ25600D: 2 states can be observed although I tested similar situation

Koyo Asaishi

Intellectual 1710 points

Part Number: BQ25600D

Hi team,

When the load is changed during low voltage battery, we can observe 2 states like below (VBUS is unconnected).
Could you estimate why 2 states can be observed although similar situation?

Pink shows Vsys waveform and green shows VBAT waveform which is 3V biased (cramped voltage of green is 2.5V).
Blue and yellow is just output of DCDC at secondary stage.

If you need more info, please let me know.

Best regards,
Koyo

over 3 years ago

0 Hong Mao over 3 years ago

TI__Expert 5590 points

Hi Koyo:

Where is the DC/DC connected to? VSYS or BAT? Please provide block diagram or describe the diagram.

What are the test condition? need more details how you set up and how you caught the waveforms. Is this DC/DC load step test?

Both blue and yellow are DC/DC output? You have 2 DC/DC?

In picture 2, is there green covered by purple?

Regards,

Hong

0 Koyo Asaishi over 3 years ago in reply to Hong Mao

TI__Intellectual 1710 points

Hi Hong,

Let me check the block diagrams and test conditions but load current will not be reported.

Most of time, the green is covered by the purple at second picture.

I suspect detection time of VBAT_DPL_FALL or VSHORT is making the 2 different operation.
I hope you can estimate these information.

Best regards,
Koyo

0 Ning T over 3 years ago in reply to Koyo Asaishi

TI__Mastermind 46551 points

Koyo,

We haven’t heard back from you for a while, the thread is considered solved and closed.

Thanks,

Ning.

0 Koyo Asaishi over 3 years ago in reply to Ning T

TI__Intellectual 1710 points

Hi Ning,

I have got schematic but I can't share on the E2E.
Let me move to offline email.

Best regards,
Koyo

0 Ning T over 3 years ago in reply to Koyo Asaishi

TI__Mastermind 46551 points

Koyo,

The thread is handled offline. It is considered closed.

Thanks,

Ning.