LM5160: Negative Input and Flybuck

Kuan Wei Chen (Kevin Chen)

Genius 9710 points

Part Number: LM5160
Other Parts Discussed in Thread: LM5575

Dear Team,

My customer is looking for Vin=-48~-54V, Vo=5V/0.1A, 3.3V/0.3A.

Can I use LM5160 here, or you have better option?

Kevin

over 6 years ago

0 Robert Blattner over 6 years ago

TI__Expert 6245 points

Hello Kevin,

The total voltage across the converter, 57.3 V is close the maximum operating voltage of this device. Have you considered the LM5575?

Regards, Robert

0 Robert Blattner over 6 years ago in reply to Robert Blattner

TI__Expert 6245 points

Hello Kevin,

I neglected to add that we have a very good flybuck page which you can find by searching for flybuck on TI’s landing page, www.ti.com. Also, I believe that 3.3 V ringing on the transformer would be hard to achieve so am reiterating that 65 V abs max may be too low.

Regards, Robert

0 Kuan Wei Chen (Kevin Chen) over 6 years ago in reply to Robert Blattner

TI__Genius 9710 points

Dear Robert,

Thanks for the response.

Just curious, can all of the buck converter support flybuck topology?

kevin

0 Robert Blattner over 6 years ago in reply to Kuan Wei Chen (Kevin Chen)

TI__Expert 6245 points

Hello Kevin,

Please reopen this thread or start a new one if you have more questions.

Regards, Robert

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LM5160: Negative Input and Flybuck