TPS62095: About VOUT setting

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Guru 21045 points

Part Number: TPS62095

Hi Team,

We would like to set “VOUT=0.8V= VREF”.

Then, we set those feedback Resistors R1=100kohm and R2=Open.

Is there any problem?

And, could you please let us know if you have any recommended value of R1?

Regards,

Kanemaru

over 5 years ago

0 Emmanuel Granatello over 5 years ago

TI__Expert 3465 points

Hello Kanemaru-san,

it's my pleasure to support you.

I would suggest to make a straight connection from Vout to FB (and Vos of course) because the assumption that the input resistance of the FB pin is infinite is only ideal. Indeed the datasheet shows that the IFB bias current for VFB=0.8 could be 100 nA max (@ VIN = 3.6V, TA = –40°C to 85°C), which implies 10mV on a 100kohm resistor.

0 Hide over 5 years ago in reply to Emmanuel Granatello

Guru 21045 points

Hi Emmanuel-san,

Thank you for your prompt reply.

I understand. Thank you very much.

Regards,

Kanemaru

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TPS62095: About VOUT setting