TPS62150 inductor current in Power-save Mode

tateo yamashiro

Guru 10890 points

Other Parts Discussed in Thread: TPS62150

Hi,

My customer has question about TPS62150.
Could you tell me about questoin?

[Question]
My customer wants to estimate peak inductor current in power-save mode at FSW=High(fsw=1.25MHz).

- How can we estimate on-time at FSW=High?
I think "ton = Vout/Vin *800 ns".
Is it correct?

- How much is the minimum on-time at FSW=High?

Best Regards,
tateo

0 Chris Glaser over 9 years ago

Yes, the peak current is calculated with equation 2.

With FSW = high, the frequency is half so the on time is double.

0 tateo yamashiro over 9 years ago in reply to Chris Glaser

Guru 10890 points

Thank you for your reply.

If FSW=High(fsw=1.25MHz),

ton=Vout/Vin *800nsec
minimum on-time=160nsec

Is it right?

Best Regards,
tateo

0 Chris Glaser over 9 years ago in reply to tateo yamashiro

No, the minimum on time is just 80 nsec. It does not depend on the FSW pin setting.

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