REF2125: Clean Start feature

Dave Chowning

Part Number: REF2125

Is a resistor really necessary on the clean start pin of the REF2125? Also, equation 5 in the data sheet for the CS pin doesn't make sense. It has Ipeak equal to a current plus a voltage (13.54uaXRcs)

over 2 years ago

0 Trailokya Rai over 2 years ago

TI__Genius 11301 points

Hi Dave

I will check and let you know.

Regards

Trailokya

+1 Trailokya Rai over 2 years ago in reply to Trailokya Rai

TI__Genius 11301 points

Hi Dave

Thanks for highlighting the equation. There is a typo. The correct equation will be -

IPeak = 466uA + (13.54uA/Kohm )* RCS

The peak current will be around 0.5mA if you short it. It will increase with the resistor and max it can go upto 19mA (it will saturate at that point.).

Regards

Trailokya

+1 Dave Chowning over 2 years ago in reply to Trailokya Rai

Prodigy 110 points

This makes sense now. My other question is: Do I have to connect a resistor to this pin if I don't need the clean start feature?

0 Trailokya Rai over 2 years ago in reply to Dave Chowning

TI__Genius 11301 points

Hi Dave

Peak current will be maximum for open condition. You don't need any resistor if you don't need clean start feature.

Regards

Trailokya

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REF2125: Clean Start feature