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Eric Shen42

Other Parts Discussed in Thread: TL431, TLV431

Dear TI:
My customer need a solution for -100mV Vin，output voltage need adjusted in real time. Vout=-70mV, -60mV，-50mV , etc, with a difference of 10mV for each output.

Is there any solution recommendation? Thanks!

Regards!

Eric Shen

over 6 years ago

0 Chris Glaser over 6 years ago

TI__Guru**** 150870 points

Hi Eric,

It's not quite clear to me. Is your Vin -100 mV? What is the variation/tolerance on it? Is there another voltage in the system?

How much output current do you need? What is the range of output voltage that is needed?

0 Eric Shen42 over 6 years ago in reply to Chris Glaser

Expert 2750 points

Hi Chris:
There is a -2V in system, customer used -2V turn to -100mV, and the -100mV need turn to other voltage.

How much output current do you need? What is the range of output voltage that is needed? What is the variation/tolerance on it?
----Output current need 500mA, output voltage range is -50mV to -90mV, the tolerance is 5mV.

Regards!
Eric

0 Chris Glaser over 6 years ago in reply to Eric Shen42

TI__Guru**** 150870 points

Hi Eric,

Thanks for explaining.

Having just negative voltages makes this complicated. I've asked our linear regulator team to look at this as well.

0 Chris Glaser over 6 years ago in reply to Eric Shen42

TI__Guru**** 150870 points

Hi Eric,

Would figure 31 in the TL431 D/S work for you? You would need to use the TLV431, with its lower Vref voltage (below your -2V input). You could adjust the output voltage by feeding a voltage into the REF pin of the TLV431.

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