low noise split rail supply for op amps

Bart

Expert 6460 points

Discussion - what's the best way to deliver split rail for powering op amps +/-12V (up to +/-18V) @ 150mA from 8-17Vin?

Would need to be simple and possibly low-noise.

Thank you.

over 5 years ago

0 Bart over 5 years ago

TI__Expert 6460 points

I was thinking something like this http://www.ti.com/tool/PMP30373#1

0 Helen chen over 5 years ago

TI__Mastermind 40080 points

Dear Sir,

What is your output voltage ripple requirement? And what is the precision of the -12V voltage, is -11 - -13V acceptable?

0 Bart over 5 years ago in reply to Helen chen

TI__Expert 6460 points

Hi Helen,

output voltage ripple: as small as possible, but within common sense - this is an audio application.

Same with regards to the precision of the +/- voltage levels (needs to be symmetrical).

0 Helen chen over 5 years ago in reply to Bart

TI__Mastermind 40080 points

Dear Sir,

You can use flyback in non-isolated topology. use +12V as the main feedback. To make the -12V has good regulation, the -12V winding should be closely coupled with the +12V main winding.

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low noise split rail supply for op amps