TPS65916: OFF2ACT Sequences for TPS659163 + AM5706

Shinya Sawamoto

Part Number: TPS65916
Other Parts Discussed in Thread: TPS65913, AM5706,

Hello experts,

My customer made a custom board for TPS65913+AM5706 quite same as the AM570x Six-Layer Reference Design.
He expects the same OFF2ACT sequence as figure-7 on the SLVUB99A(TPS65916 User's Guide to Power AM570x), but there is an unexpected delay channel on the LDO4 observed.
I attached the waveform. Would you mind reviewing it and I'd like to know your advice if there is any possible reason for this issue?

Thanks in advance.
S.SawamotoTPS659163 OFF2ACT.pdf

over 5 years ago

0 Mahmoud Harmouch over 5 years ago

TI__Mastermind 28260 points

Hello,

The device OTP is tested and it is unlikely due to OTP. I suggest to disconnect the processor and check the part OTP. It could be something overloading LDO4 such as clamp to lower level supply voltage. Scope picture shows LDO starting on time but the first part of the slope is slowed down.

Regards

0 Shinya Sawamoto over 5 years ago in reply to Mahmoud Harmouch

TI__Expert 5285 points

Thanks,

OK, I'll check if there is any possibility of an over loading on the LDO4.
I may ask you on the email when I have something new question.

Regards,
S.Sawamoto

0 Mahmoud Harmouch over 5 years ago in reply to Shinya Sawamoto

TI__Mastermind 28260 points

Great!

We think the issue is resolved and this thread is closed. Please submit another thread or send me message offline for further support.

Regards

Power management

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TPS65916: OFF2ACT Sequences for TPS659163 + AM5706