TPS23523: How to decide Css value?

Kazuhiko Hirano

Part Number: TPS23523

Hello,

Base on which condition should Css be decided, to avoid running the timer or to limit the inrush current below CL2?

Whichever larger calculated Css should be used?

Best regards,

K.Hirano

over 4 years ago

0 Rakesh over 4 years ago

TI__Guru** 105361 points

Hi Hirano,

Css value determines the inrush current limit and should be selected to limit the inrush current < CL2. Please select as per equation (13) in the datasheet.

Best Regards, Rakesh

0 Kazuhiko Hirano over 4 years ago in reply to Rakesh

TI__Genius 15008 points

Rakesh,

Thank you for your response.

However, the equation (13) comes from VSNS,TMR1, not VSNS,CL2, because VSNS,TMR1 is used at equation (12).
I other words, my question is which is used to calculate Css, VSNS,TMR1 or VSNS,CL2.
So, please let me know which should be used at equation (12), VSNS,TMR1 or VSNS,CL2.

Best regards,

K.Hirano

+1 Rakesh over 4 years ago in reply to Kazuhiko Hirano

TI__Guru** 105361 points

Hi Hirano,

Please use VSNS,TMR1 for calculations because it is the threshold at which the fault timer starts to run. VSNS,TMR1 provides more margin and is safe to avoid false shutdown.

Best Regards, Rakesh

0 Kazuhiko Hirano over 4 years ago in reply to Rakesh

TI__Genius 15008 points

Rakesh

I see, thanks a lot!

Best regards,
K.Hirano

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TPS23523: How to decide Css value?