TINA/Spice/LP2902: LP2902 Ouput impedance

Hugo Wang

Expert 1525 points

Part Number: LP2902
Other Parts Discussed in Thread: TINA-TI,

Tool/software: TINA-TI or Spice Models

Hi Sir

Could you share output impedance at LP2902? Since I don't see it in spec. Thank you a lot.

over 5 years ago

0 Paul Goedeke over 5 years ago

TI__Mastermind 30600 points

Hi Hugo,

Let me see if we have any collected data on this - we won't be able to provide any guaranteed spec, but we should be able to provide an example.

Please allow me a day or two to get back to you.

Best,
Paul

0 Paul Goedeke over 5 years ago in reply to Paul Goedeke

TI__Mastermind 30600 points

Hi Hugo,

I went to the lab to take some sample data - here is the Zo curve for this device. It will give you a ballpark idea:

Hope this helps,

Paul

0 Ron Michallick over 5 years ago in reply to Paul Goedeke

TI__Guru*** 142786 points

Hugo,

The Zo chart was taken at 30V supply, VCM=VOUT=15V, Load was 100k resistor to ground.
The output stage of LP2902 has a class B source and sink drivers. There is a large cross over voltage (about 2V) on the internal predriver; that coupled with the 50V/ms slew rate causes a 40us delay between sourcing and current current modes. In summary, it is best to have a unidirectional output current flow for best performance.

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TINA/Spice/LP2902: LP2902 Ouput impedance