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The first rule only applies in the usual case where the op amp is used in a closed-loop design (negative feedback, where there is a signal path of some sort feeding back from the output to the inverting input). These rules are commonly used as a good first approximation for analyzing or designing op-amp circuits. [8]: 177
Operational Amplifier Power Supply Rejection Ratio (PSRR) and Supply Voltages by Analog Devices, Inc. Definition and measurement of PSRR. Application Note on PSRR Testing of Linear Voltage Regulators, by Florian Hämmerle (OMICRON Lab) and Steven Sandler (Picotest) Introduction to System Design Using Integrated Circuits, via Google Books
Closed-loop regulator circuits using the TL431 are always designed to operate in high transconductance mode, with I CA no less than 1 mA (point D on the current-voltage curve). [ 8 ] [ 7 ] [ 2 ] For better control loop stability, optimal I CA should be set at around 5 mA, although this may compromise overall efficiency.
Dual op-amps with fixed 2.5 V reference [20] LM611 Op-amp with an adjustable voltage reference [21] LM614 Quadruple op-amps with an adjustable voltage reference [22] LM675 Power op-amp with a maximal current output of 3 amperes [23] LM709 Yes General-purpose op-amp [24] LM741 LM709 General-purpose op-amp. [25] Widely used. LM747: Yes
Series regulators are the more common form; they are more efficient than shunt designs. The series regulator works by providing a path from the supply voltage to the load through a variable resistance, usually a transistor (in this role it is usually termed the series pass transistor); it is in the "top half" of the voltage divider - the bottom half being the load.
An integrated circuit voltage regulator. A voltage regulator is a system designed to automatically maintain a constant voltage. It may use a simple feed-forward design or may include negative feedback. It may use an electromechanical mechanism, or electronic components. Depending on the design, it may be used to regulate one or more AC or DC ...