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Slew Rate of Op Amp

Slew Rate of Op Amp 

The slew rate define as maximum rate of change of the output voltage with time, 

 slew rate  s = dv0/dt

v0 = output voltage of the Op Amp
The slew rate is cause due to the limited  charging rate of the compensation capacitor and the current limiting and the saturation of the internal stage of an Op-Amp , when high frequency large signal is applied . The internal capacitor voltage cannot change instantaneously.
it is given by 

dvc/dt = I/C

For the larger charging rate charging current must be large or the capacitance of the capacitor must be small.
Hence the slew rate for an Op-Amp  is given as ,
                                         

 S= Imax/C 

for example :
For the IC 741 charging current is 15 micro Ampere internal capacitance is 30 micro Farad. Hence  the slew rate is  0.5 volt/micro second

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