A monolithic power op amp

Author

Widlar, Robert J. ; Yamatake, Mineo

Volume

23

Issue

2

fYear

1988

fDate

4/1/1988 12:00:00 AM

Firstpage

527

Lastpage

535

Abstract

The standard junction-isolated power process has been modified by the addition of polycrystalline-film resistors to solve the topological problems encountered in making 90-W, 80-V, 10-A power transistors and connecting them together for a push-pull output. An all n-p-n output stage that holds crossover distortion to 0.01% while driving a 4-Ω load, even with the quiescent current below 20 mA, has been developed. It is stable with all reactive loads and does not have the spurious-oscillation problems observed with the familiar quasicomplementary amplifier. These innovations are described along with the design of a complete power op amp, the LM12. The prevention of failures from substrate currents which occur when the output is driven outside the supply by inductive loads is discussed

Keywords

bipolar integrated circuits; electric distortion; integrated circuit technology; operational amplifiers; power amplifiers; power integrated circuits; 10 A; 20 mA; 4 ohm; 80 V; 90 W; LM12; all n-p-n output stage; crossover distortion; innovations; junction-isolated power process; monolithic power op amp; polycrystalline-film resistors; power transistors; push-pull output; quiescent current; reactive loads; stable with inductive loads; substrate currents; topological problems; Joining processes; Operational amplifiers; Packaging machines; Power amplifiers; Power transistors; Protection; Regulators; Resistors; Technological innovation; Voltage;

fLanguage

English

Journal_Title

Solid-State Circuits, IEEE Journal of

Publisher

ieee

ISSN

0018-9200

Type

jour

DOI

10.1109/4.1018

Filename

1018