On Tue, Mar 4, 2025 at 03:39 PM, john23 wrote:
Hello Andy , regarding the 200Ohm load,How did you? see that I am over loading the opamp?
From the datasheet and a few calculations.
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Your simulation uses +/- 7.5 V power.? Let's assume the output can approach (not reach) the rails.? The output pin sees R2 = 200 ohms to a virtual ground.? 7.5 / 200 = 37.5 mA.? The datasheet shows output short-circuit current = 40 mA typical with +/- 5 V supplies.? ?That is not guaranteed.? Figure 37 shows the output saturation voltage, where the output can't source or sink any more current.? It starts limiting around 25 mA, which is less than 37.5 mA, and again that is typical.? Let's say the minimum at clipping is 20 mA, which limits your outputs to only half the supply voltages (clips at +/- 4 V because of the 200 ohm load).
Could you say what measurement needs to be done and where in the datasheet I need to look for this issue to see that I am not ruining the OPAMP?
With the circuit wired as it was simulated, see at what point the output voltage clips.? Again, keep in mind it is typical only; worst-case will be worse than what is measured.
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Andy
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