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UC2856: Error Amplifier: OTA

Nikhil Chodankar
Prodigy 30 points
Part Number: UC2856

Tool/software:

Hi There,

Im modelling the UC2856 for spice simulation, Im working on Error amplifier section in which I required some missing parameters in the datasheet as below:

1.Input Impedance

2.Output impedance

3.Ao (Voltage gain) value at RL(Outpur Load)= Infinity

Please provide the detailed values as per above required parameters

Thanks,

Nikhil

  • +1
    TI__Guru 58655 points

    Hi,

    These are ok to get from the below datasheet.

    1. VFB max 40V, current 1uA, so 40M ohm

    2. COMP = 2.5V, its current = 0.5mA, so output impedance = 2.5V/0.5mA = 5k-ohm for source current, for sink, 1.2V/10mA = 120 ohm

    3. 100 dB