TPS563210A: About soft start calculation

Satoshi

Guru 19495 points

Part Number: TPS563210A

Please let me check about soft start equation of TPS563210A.

However datasheet is described below equation, datasheet Figure 17 and Figure 28 and 29 are not match.

I think that equation have typo for somewhere unit, is it correct?

(For example, Tss(ms) is typo and correct is Tss(s), etc)

※I calculated on Css: 8200pF, Tss was be 0.89913μs.

Best regards,

Satoshi

over 6 years ago

0 Yuchang Zhang over 6 years ago

TI__Mastermind 18510 points

Hi Satoshi,

please double check your calculation, For 8200pf(8.2nf), I think the TSS should be 8.2e-9*0.765*0.86/6e-6~=0.9ms.

Check the waveform 10%-90%, they are matched.

0 Satoshi over 6 years ago in reply to Yuchang Zhang

Guru 19495 points

Yuchang Zhang-san

Thank you for reply.
I agree with your calculation, but unit is 0.9μs.
Datasheet equation is described "Tss(ms)", I think that unit of "ms" is typo, is it correct?

Best regards,
Satoshi

0 Yuchang Zhang over 6 years ago in reply to Satoshi

TI__Mastermind 18510 points

Hi Satoshi-san,

Yeah, the "ms" should be "s", I will let team to correct it, thanks.

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TPS563210A: About soft start calculation