Maximum Output Voltage of a LF411 inverting Op-Amp

In summary: V. This means the voltage at Q3 will be less than the rail voltage, so the output can't go any higher.In summary, the OP amp can only output a voltage within +/-15V of the rails. If you're using it with a supply that's lower than that, you'll need to adjust your gain to make up for it.
  • #1
ckboii89
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Homework Statement


Prelab material, I know how to solve for the gain and vout on a circuit. But reading the actual manual of a op-amp is confusing and I just want to make sure I'm correct. The initial input voltage will be a 1V triangle wave. Then later we increase the voltage to 3V. R1 is 1K and R2 is 10k.Here is the manual:
https://c8ad3030-a-62cb3a1a-s-sites.googlegroups.com/site/ece35fall2013/lab-files/LF411.pdf?attachauth=ANoY7cp7jf3VzZkloe5hCZF3-adLMzKwTZs5blfi3Rp2Zg8oP_9M89hjVq6ird126VkCh9O_71xGbeXVGIlt0AidR7GaLnaLpqTz8MdA1A50gsFOVQBS2uVLscOtqFdcksXPXY5H3O_HpAPDh5VQ0FQK4YC7Y4tyMNoHeZnNjPM02zItNjttYD7rhhp6g1MO_Wk1kdJ7gepgBaOSsO9uz3-uz7LvdPP7-gmbbBcnyMkwOeEK2bMkHCU%3D&attredirects=0


Homework Equations


Vout/Vin = -R2/R1


The Attempt at a Solution


I know the output voltage will be ±10V for the 1V triangle wave. But for the 3v, if I am reading correctly, Vs = ±15 at the Vo tab under DC characteristics, which means the output voltage will be ±18 even though our gain is supposed to be a factor of 10. Is this correct? Thanks
 
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  • #2
Op amp output voltage is limited by the supply rails ... that's your voltage source.

So if the max rating on the rails is +/-18 V, you can never exceed that, regardless of the amplification. Looking at the spec sheet I am not sure what the actual limits are ... about 15 V from a quick look, which is less than the max at the rails.

So you want to limit your Vin to values which generate a Vout which is possible with the maximum voltages supported.
 
  • #3
Many OP amps can't get within 3V of their rails so a general rule would be 18V-3V = 15V. That appears to be the case for this op amp. Interesting to consider what they use in 3V and 5V portable devices.

Is the triangle wave 3V peak to peak? If so then with a gain of 10 the output will be 30V peak to peak. Half of that is 15V so you might just get away with it on +/- 18V supplies.

Take a look at the circuit on page 9 of the data sheet. the reason the output cannot swing higher is the voltage drop across this path 300R -> Q1 -> 33R -> Q3 -> Q6 -10R
 

What is the Maximum Output Voltage of a LF411 inverting Op-Amp?

The maximum output voltage of a LF411 inverting Op-Amp is determined by the power supply voltage and the gain of the Op-Amp circuit. It can be calculated using the formula Vout = -Vin x (Rf/R1), where Vin is the input voltage, Rf is the feedback resistor, and R1 is the input resistor. The maximum output voltage cannot exceed the power supply voltage.

How does the maximum output voltage affect the performance of the Op-Amp?

The maximum output voltage is an important factor in the performance of an Op-Amp. If the output voltage exceeds the power supply voltage, the Op-Amp will enter into saturation mode and the output will become distorted. This can affect the accuracy and linearity of the output signal.

What is the typical maximum output voltage for a LF411 inverting Op-Amp?

The typical maximum output voltage for a LF411 inverting Op-Amp is around 10-12 volts. However, this may vary depending on the specific model and manufacturer. It is important to consult the datasheet for the specific Op-Amp being used.

Can the maximum output voltage be increased?

Yes, the maximum output voltage of a LF411 inverting Op-Amp can be increased by using a higher power supply voltage or by using a larger feedback resistor. However, it is important to make sure that the Op-Amp can handle the increased voltage and that the input and output signals remain within the specified range.

What happens if the maximum output voltage is exceeded?

If the maximum output voltage is exceeded, the Op-Amp will enter into saturation mode and the output will become distorted. This can also cause excessive heat and potentially damage the Op-Amp. It is important to ensure that the maximum output voltage is not exceeded to maintain the accuracy and reliability of the Op-Amp circuit.

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