LM5000 in SEPIC topology?

Andy Kay

Intellectual 765 points

Other Parts Discussed in Thread: LM5001, LM5000, TPS61175

Hi there,

I want to design a voltage converter from 24V to a variable output voltage from 12V to 36V.

Actually, I'm planning to use SEPIC topology.

LM5001 seems to fit, but has a too low Imax rating of only 1A.

Thus, I'm thinking of using the LM5000 instead (Imax=2A),

but in the datasheet, there is no remark for SEPIC topology.

1) Is the LM5000 suitable to be used in SEPIC topology?
2) Are there any Spice Models of the LM5000?

Best regards, Andy

over 9 years ago

0 Andy Kay over 9 years ago

Intellectual 765 points

Any TI member reading this?

0 JohnTucker over 9 years ago in reply to Andy Kay

TI__Guru**** 191445 points

It is a holiday in the US.

0 Andy Kay over 9 years ago in reply to JohnTucker

Intellectual 765 points

Any answer would be appreciated.

0 David Baba over 9 years ago

TI__Mastermind 40040 points

Hi,

You can certainly use the lm5000 in a sepic configuration. Need to be careful and look at the min ilimit level not typical. Unfortunately there are not standard models for lm5000 in a sepic. If you provide me specifications I can check suitability.

Thanks.

David.

0 Andy Kay over 9 years ago in reply to David Baba

Intellectual 765 points

Thanks a lot, David!

0 Helen chen over 9 years ago

TI__Mastermind 40080 points

You can allso try TPS61175, please check app: SLVA384 Designing a Split-Rail SEPIC With the TPS61175. This is a 3A Boost converter!

0 Andy Kay over 9 years ago in reply to Helen chen

Intellectual 765 points

Thanks Helen,
I would have loved to use the TPS61175 (was one of my favorites), but unfortunately its switch has a voltage rating of only 40V.

But I think, I need a switch-voltage-rating of at least Vswitch >= Vin+Vout = 24V+36V = 60V in my application (see my first post), or am I missing something?

Best regards, Andy

Power management

Power management forum

LM5000 in SEPIC topology?