LM43603 Flybuck topology

tateo yamashiro

Guru 10890 points

Other Parts Discussed in Thread: LM43603, LM25017

My customer has a question about LM43603.
Could you tell me about question.

[Question]
Can LM43603 be used Flybuck topology like LM25017?
My cusutomer want to use Automotive application.

0676.Flybuck topology.pptx

Best regards,

tateo

over 9 years ago

0 Vijay86929 over 9 years ago

TI__Genius 11490 points

Hi,

Fly-Buck topology needs forced CCM operation. LM43603 does not have a forced CCM (PFWM) option. Therefore it can not be used as a Fly-Buck converter when their there is no load on the primary (non-isolated) output.

Thanks and regards,

Vijay

0 tateo yamashiro over 9 years ago in reply to Vijay86929

Guru 10890 points

Thank you for your reply.

Does the device needs to operate sinking inductor current at no load on primary output?
Can you recommend best device for Automotive application?

Best regards,

tateo

0 Vijay86929 over 9 years ago in reply to tateo yamashiro

TI__Genius 11490 points

That is correct.

How much current do you need?

0 Vijay86929 over 9 years ago in reply to Vijay86929

TI__Genius 11490 points

Does the part need to be Q-grade.

0 Vijay86929 over 9 years ago in reply to Vijay86929

TI__Genius 11490 points

Does the part need to be Q-grade?

0 tateo yamashiro over 9 years ago in reply to Vijay86929

Guru 10890 points

Thank you for your reply.

Here is power supply specifications.

Vin: 6.5 - 16V
Vout_1: 5.5V
Iout_1: 90mA
Vout_2: 16.5V
Iout_2: 50mA
Q-grade: need

Best regards,

tateo

0 Vijay86929 over 9 years ago in reply to tateo yamashiro

TI__Genius 11490 points

Actually, we don't have Q-grade Fly-Buck regulator parts that I am aware of. We may have something next year.

regards,

Vijay

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LM43603 Flybuck topology