TPSM33625: TPSM33625RDNR

Nimesh Rana

Part Number: TPSM33625

Tool/software:

Hello Team,

We are using TPSM33625RDNR part for the 5V regulation. Input voltage will be 19V to 29.5V (29.5V Typ), total current on 5V is ~55mA.

We have observation that while we tuned off and turn on again power input source, input and output voltage rail become short. I have attached here snapshot of circuit implementation. Please help to point out possible checkpoints.

Your quick support will be highly appreciated!

Regards,

Nimesh

2 months ago

0 Andrew Kutzler 2 months ago

TI__Mastermind 23685 points

Hi Nimesh,

I've assigned an expert to this post.

Thanks,

Andrew

0 Nimesh Rana 2 months ago in reply to Andrew Kutzler

Intellectual 470 points

Thanks Andew,

Could you please help to get input earlier as we have larger batch production in on hold due to this issue?

Hope you can understand!

Regards,

Nimesh

0 Oscar Ambriz 2 months ago in reply to Nimesh Rana

TI__Expert 8620 points

Hello Nimesh,

I have reviewed the schematic, and it looks good. If possible could you provide a oscilloscope capture of the input voltage when the device is being turned on? Additionally, a capture of the voltage at the switch node. We would like to asses the operation of the device when the issue is occuring.

Regards,

Oscar Ambriz

0 Nimesh Rana 2 months ago in reply to Oscar Ambriz

Intellectual 470 points

Hello Oscar Ambriz,

Greetings for the day!

Attached here waveform of input voltage taken while tuning On and Off power source. Input voltage was 28.8V and observed max voltage at input capacitor is 30.8V which is below the max limit of IC input voltage range (36V).

For SW node I will share it on Monday!

Regards,

Nimesh Rana

0 Nimesh Rana 2 months ago in reply to Nimesh Rana

Intellectual 470 points

Hello Oscar Ambriz,

Greetings for the day!

Attached here waveform measured on SW pins.

Waiting for your quick input that help us to proceed further.

Regards,

Nimesh Rana

0 Oscar Ambriz 2 months ago in reply to Nimesh Rana

TI__Expert 8620 points

Hello Nimesh,

I would like to move this thread to email at this time, this will allow me to loop in more of our experts. I have sent you an email, please let me know if it was not received. I will close the thread at this time.

Regards,

Oscar Ambriz

Power management

Power management forum

TPSM33625: TPSM33625RDNR