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noisy feedback line

Category: Hardware
Product Number: MAX1771

I am using the MAX1771 in non-bootstrapped mode to generate high voltage.  See the attached picture for reference.

I have a transformer demo board to use as a flyback transformer, charging a 160nF cap.

I am using an isolated amplifier to monitor the cap voltage & provide feedback to the MAX1771.

I am seeing a lot of noise on the feedback line.  I have the scope probe connected to the feedback line of the MAX1771.  See picture of scope trace for reference.

 Maybe I have a ground loop somewhere....?

Any suggestions will be greatly appreciated!

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