REF5025: Negative Output

Hirotsugu Kobayashi

Mastermind 9540 points

Part Number: REF5025

Hi team,

Is it possible to generate -1.5V with -4V GND?

Best Regards,

over 2 years ago

0 Masoud Beheshti61 over 2 years ago

TI__Mastermind 18071 points

Hello,

Please kindly refer to this application note:

https://www.ti.com/lit/an/sboa362/sboa362.pdf

Thank you.

0 Hirotsugu Kobayashi over 2 years ago in reply to Masoud Beheshti61

Mastermind 9540 points

Hi Masoud,

I want to generate +2.5V with respect to the negative voltage of the reference.
For example, add 2.5V to -4V to generate -1.5V, -3.5V to generate -1V.

Best Regards,

0 Trailokya Rai over 2 years ago in reply to Hirotsugu Kobayashi

TI__Genius 11401 points

Hi Hiro

Any noise on -4V (connected to the GND pin of REF50) will directly appear on the output, and it will not be a clean supply which is why this scheme is not preffered.

You will get stable output with respect to gnd in the app note method suggested by Masoud.

Regards

Trailokya

Power management

Power management forum

REF5025: Negative Output