LP2902: Request about Phase vs Frequency Curve of LP2902.

Shuang Feng76

Expert 3110 points

Part Number: LP2902
Other Parts Discussed in Thread: LP2904

Hi Team,

Whether we have Phase vs Frequency Curve of LP2902.

there is no related data in LP2902 or LP2904.

over 1 year ago

0 kai klaas69 over 1 year ago

Guru 140200 points

Hi Shuang,

there's very little information in the TI's datasheet. Even the original National Semiconductor's datasheet doesn't contain a phase versus frequency curve, though, only a gain versus frequency curve:

lp2902_ns.PDF

Kai

0 Ron Michallick over 1 year ago in reply to kai klaas69

TI__Guru*** 142766 points

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.

0 Ron Michallick over 1 year ago in reply to Ron Michallick

TI__Guru*** 142766 points

Shuang,

I'm sure that the input signal used was much lower.

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LP2902: Request about Phase vs Frequency Curve of LP2902.