Electronic – Short Circuit Output Current – IC Definitions

integrated-circuitoperational-amplifier

What does "Short Circuit Output Current" mean? Does it mean that the voltage output will be to 0V at this specified current? So what would be the maximum current sourced without having a large impact on the voltage output? There is no graphic, it would be nice to have the voltage output in function of the load!

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Here is the datasheet: https://datasheet.octopart.com/FAN4174IS5X-Fairchild-Semiconductor-datasheet-8824583.pdf

Thank you very much and have a nice day!

Best Answer

These are Rail-to-Rail I/O, CMOS Amplifiers.

Datasheet indicates Vs=5V. In this context, short-circuit implies operating the CMOS FET outputs with RdsOn at any output voltage rail to rail.

Thus +/-33 mA means RdsOn = 5V/33mA = 150 Ohms typical equivalent resistance. This affects the output rise time for step pulses into a know C load. However when not shorted, Zout is reduced by feedback gain in linear mode.

added:

  • Under different conditions the table also says;
  • RL=10k to Vs/2 (for Vs=5V) Vo= 0.01 to 4.99V I=250uA, thus RdsOn=40
  • RL=1k to Vs/2 (for Vs=5V) Vo= 0.10 to 4.90V I=2.5mA thus RdsOn=40

proof by Simulation

Using KVL as follows;

schematic

simulate this circuit – Schematic created using CircuitLab

Only in 3.6V logic do they make lower RdsOn =25 Ohms +/50% in order to shoot-thru and yet have high speed.

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