REF2125: REF2125 use Vref voltage for sequencer UCD90320

Alexander Vasilyev

Part Number: REF2125
Other Parts Discussed in Thread: UCD90320

Hi.

I want to use a reference voltage REF2125 for the chip UCD90320.

I use REF2125 with the following connection parameters: Cin = 4,7uF, Ccs = 100nF, Rcs=330 Ом, Cout 4,7uF. At source (REF2125) out voltage = 1.9V, but should be 2,5V.

I can something that is not connected correctly?

over 5 years ago

0 kai klaas69 over 5 years ago

Guru 140200 points

Hi Alexander,

the chip is enabled? What is the input voltage? Have you read section 9.2.2.2 of datasheet?

Kai

0 Alexander Vasilyev over 5 years ago in reply to kai klaas69

Prodigy 20 points

Hi, Kai.

Chip is enabled. Input voltage 3,3 V, accuracy 5%. The problem was solved by replacing Rcs. Set Rcs = 330kOm and the output voltage is 2,5V.
Thank you for the answer.

Alexander

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REF2125: REF2125 use Vref voltage for sequencer UCD90320