TPS62745: How to calculate inductors.

Kengo.Y

Guru 11255 points

Part Number: TPS62745

Hi team.

I'm worried about how to calculate inductors.

TPS62745 has variable switching frequency.

Could you tell me how to calculate inductors?

And I have one more question about PG pin.

I will not use PG pin.

How to processing unused terminal(PG pin)?

Sincerely.

Kengo.

over 6 years ago

0 Dorian Brillet de Cande over 6 years ago

TI__Genius 14876 points

Hi Kengo,

Those formulas are meant for you to calculate the inductor ripple and the maximum inductor current current.
We recommend in Table 4 of the Datasheet a list of output filter combinations to make it easier for users.

You can leave PG pin unconnected if not used.

Thank you very much!
Best Regards.

Dorian

0 Kengo.Y over 6 years ago in reply to Dorian Brillet de Cande

Guru 11255 points

Hi Dorian.

Thank you so much your quick response.

Exactly what you say.
But I want to know more detail about selection of inductor.
Could you pls tell me about calculate following conditions ?

Vin:5~10V(Almost 8V)

Vout:3.3V

Sincerely.

Kengo.

0 Dorian Brillet de Cande over 6 years ago in reply to Kengo.Y

TI__Genius 14876 points

Hello Kengo,

I recommend you for these conditions to use a 4.7uH inductor. It will be a good fit for your application.
Thank you,

Dorian

0 Kengo.Y over 6 years ago in reply to Dorian Brillet de Cande

Guru 11255 points

Hi Dorian.
OK.
I'll try your recommendation.

Sincerely.
Kengo.

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TPS62745: How to calculate inductors.