How to generate -75V from 24V rail?

Antonio Faggio

Other Parts Discussed in Thread: LM5155, TAS5630B

Hi,

For a new project I need some recommendations in terms of products/Ref Designs/Eval Board for:

DCDC, DCin 19-30V, DCout - 75Vdc outP125W powering an audio OpAmp. I would need high switching f here so to reduce footprints of passives. Any comments?

The DCDC needs also to generate +75V on 125W and for this I would use LM5155 in boost topology, only question stands for how to generate the -75V.

Many Thanks,

Antonio

over 5 years ago

0 Youhao Xi over 5 years ago

TI__Guru* 78200 points

Hi Antonio,

Please contact the buck group. An inverting buck-boost requires a buck controller. Let me forward this to our WV group colleagues.

Thanks,

Youhao

0 Andy Chen over 5 years ago

TI__Mastermind 34485 points

Hi Antonio,

It's a quite challenge design to generate -75V 125W from 19V--30V with Buck-boost converter.

Do you consider the full bridge audio amplifier which only need +75V for same output power?

B R

Andy

0 Antonio Faggio over 5 years ago in reply to Andy Chen

TI__Expert 7900 points

Hi All,

I said buck boost converter just as a reference but please if you have other comments feel free to share.

I am looking for proposal, which full bridge audio amplifier are you referring to?

Many Thanks,

Antonio

0 Andy Chen over 5 years ago in reply to Antonio Faggio

TI__Mastermind 34485 points

Hi Antonio,

Just for example, you can check product TAS5630B 300-W Stereo and 400-W Mono PurePath™ HD Analog-Input Power Stage which only require a single 50V power supply.

I will forward you inquiry to Amplifier product group for better support.

B R
Andy

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How to generate -75V from 24V rail?