LP2902: Request about Phase vs Frequency Curve of LP2902.

Hello Shuang,

I found a test result where phase margin was about 50 degrees at gain = 0dB using setup below. 

Phase Gain analyzer also uses IN- pin as a reference signal. It records VOUT/IN- gain and phase

Note the load to -Vs because LP2902 prefers a uni-polarity load current.

There is a time delay on output current polarity change.