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How is the power consumption of an operational amplifier calculated?

Latest Updated:12/01/2011

Question:

How is the power consumption of an operational amplifier calculated?

Answer:

The power consumption is calculated from the circuit current of the operational amplifier itself and from the output load current.
Examples of when the output current flows out and flows in are shown below.

(1) Output current flowing out



(2) Output current flowing in





For example, the power consumption in the case of the above diagrams is as follows.

(1) Power consumption from circuit current of operational amplifier itself:
ICC×(V+-V-)=1(mA)×30(V)=30(mW)

 

(2) Power consumption from output load current:
IO×(V+-VO)=10(mA)×10(V)=100(mW)


(1)+(2)=130(mW)

Suitable Products
Operational Amplifiers
USB2.0 Host/Peripheral Controller
UPD720150