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TLV9104: Power supply connection and driving capacitive loads

Part Number: TLV9104


We are currently using the op-amp in an application using an inverting amplifier configuration with the positive supply connected to ground and the negative supply connected to -5.2V.   We only require negative output voltages from the op-amp.  This configuration is working fine.  We get 0 to -5V output as required. Also, the amplifier seems to be stable, even when driving a heavy capacitive load (4.7 uF).  But to insure stability, we have also put a 100 ohm resistor in series with the output.  This is a DC bias driver application and do not require frequency response beyond 100 Hz maximum.  We want to get confirmation that using the amplifier in this configuration will be reliably stable. A representative schematic is shown below.

Thanks,
Mike

  • Hi Mike,

    With the circuit you describe I simulate >65 degrees of phase margin assuming 1k ohm resistors are used in the feedback. Please see the attached simulation file to make sure I have understood everything correctly. The simulation used dual supply but that will not effect the stability results.

    I also recommend watching our TI Precision Lab Videos on Stability for more information on how to simulation the phase margin of your circuit.

    Thank you,

    Tim Claycomb

    TLV9102 Stability.TSC