TPS65400: Start-up Failure at Low Temperature.

Kengo.Y

Part Number: TPS65400

Tool/software:

Hi team,

I'd like to know about start-up failure at Low Temperature( using a cold splay).

Waveform as bellow.
Could you tell me why it won't start up?

Soft start( tss) = 670us

*5ms/div

*100us/div

BR,
Kengo.

6 months ago

0 Lucia Gao 6 months ago

TI__Mastermind 30011 points

Dear Kengo,

Pls kindly let me check your question and get back to you during these days.

BRs

Lucia

0 Kengo.Y 6 months ago in reply to Lucia Gao

Guru 11155 points

Lucia,

How about your progress?
I need your comment ASAP.

BR,
Kengo.

0 Lucia Gao 6 months ago in reply to Kengo.Y

TI__Mastermind 30011 points

Dear Kengo,

Did you see this issue only when the temperature is cold? And what is the temperature now? Could it be reproduced for all devices and all boards?

Could you pls kindly share with me the schematic? I am not sure if you have very large output capacitor, but I recommend you can try to increase the Css (soft start capacitor) and extend the soft start time to around 5ms to try.

Thank you!

BRs

Lucia

0 Kengo.Y 5 months ago in reply to Lucia Gao

Guru 11155 points

Lucia,

Temperature is unknown as I used a cold spray.
I'd like to talk on private message.
So, I'll send friend ship request.

I tried to change soft start (6.7ms)
There were no problem to start up with cold.
Could you tell me why this is?

BR,
Kengo.

0 Lucia Gao 5 months ago in reply to Kengo.Y

TI__Mastermind 30011 points

Hi Kengo,

Good to know the issue is resolved. And yes, we can discuss offline. Thank you!

BRs

Lucia

0 Kengo.Y 5 months ago in reply to Lucia Gao

Guru 11155 points

HI Lucia,

Could you accept my request?

BR,
Kengo.

+1 Lucia Gao 5 months ago in reply to Kengo.Y

TI__Mastermind 30011 points

Hi Kengo,

Sure, no problem.

BRs

Lucia

0 Kengo.Y 5 months ago in reply to Lucia Gao

Guru 11155 points

Hi Lucia,

Could you reply on private E2E?

I'd like to know why I solved this problem by reducing the output capacity.

BR,
Kengo,

+1 Lucia Gao 5 months ago in reply to Kengo.Y

TI__Mastermind 30011 points

Dear Kengo,

No problem. I gave you my reply on private message. Thank you!

BRs

Lucia

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TPS65400: Start-up Failure at Low Temperature.