TPS54260: current limit

K.Yaita

Part Number: TPS54260

Hi Team,

My customer saw current limit is operating due to inrush current when start-up.
Is it possible case to damage the device?

I believe it doesn't damage the device however would like to confirm just in case.

Best Regards,
Yaita

over 6 years ago

0 Timothy Hegarty over 6 years ago

TI__Guru 74052 points

Hello, I forwarded your enquiry to the product expert. Can you share the schematic and layout?

Regards,
Tim

0 K.Yaita over 6 years ago in reply to Timothy Hegarty

Guru 29720 points

Hi Tim-san,

Thank you for your kind support.
I would just like to know inrush current of start-up is possible to damage TPS54260 or not.
I believe current limit can protect TPS54260 itself however would like to confirm just in case.

Best Regards,
Yaita

0 Ambreesh Tripathi over 6 years ago in reply to K.Yaita

TI__Expert 6860 points

Yaita ,

Please increase SS cap to limit the peak current during the Start up . You can simulate the same on Spice model available on the product folder . .

---Ambreesh

0 K.Yaita over 6 years ago in reply to Ambreesh Tripathi

Guru 29720 points

Hi Ambreesh-san,

Thank you for your reply.
I would like to ask about Absolute maximum Ratings.

The following shows "Current limit" for Source current of PH and Sink current of VIN.
I believe these indicate internally protected by current limit feature in terms of Absolute Maximum Ratings.
Is my understanding correct?

Best Regards,
Yaita

0 Ambreesh Tripathi over 6 years ago in reply to K.Yaita

TI__Expert 6860 points

Yes , the device should limt the peak current within the threshold .

Is the saturation current of the induction higher than current limit of the design ie 6A ? If not then the inductor can get saturated and very igh current flow during the blanking time of the device , thereby damaging it .

Further Also did the design take into consideration the overcurrent protection while determing the swicting frequency ?

---Ambreesh

0 K.Yaita over 6 years ago in reply to Ambreesh Tripathi

Guru 29720 points

Hi Ambreesh-san,

Thank you for your advice!
I will check what you commented.

Best Regards,
Yaita

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TPS54260: current limit