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TPS7A47 Soft-Start

Anton Dos

Prodigy 90 points

No answer for me?
Can I get at least a startup time for Cnr = 10 nF ?

Best regards,
Anton Dos

over 11 years ago

0 Ryan Eslinger over 11 years ago

TI__Guru 55940 points

Hi Anton,

We are currently revising the datasheet to add the soft-start equation:

Tss = R * C * ln[(Vout + I * R) / (I * R)]; R = 100k, I = 50uA, C = external soft-start cap

Very Respectfully,

Ryan

0 Anton Dos over 11 years ago in reply to Ryan Eslinger

Prodigy 90 points

Hi Ryan,

Thanks for information.

In - max output current ? But in the case of fig. 21 page 9 from datasheet (Vout = 5V, Iout = 500 mA) Tss = 100 ms (specified tss = 65 ms).

I will wait for the datasheet update. Thank you.

0 Ryan Eslinger over 11 years ago in reply to Anton Dos

TI__Guru 55940 points

Hi Anton,

The ln is for a natural log.

Very Respectfully,

Ryan

0 Anton Dos over 11 years ago in reply to Ryan Eslinger

Prodigy 90 points

Hi Ryan,

Excuse me, I thought about the output current, because you asked about it before.

Thank you.

Best regards,

Anton