经典LDO专题

semico_ljj

经典LDO专题
包含：
Understanding the Terms and Definitions of LDO Voltage Regulators.pdf
Understanding the stable range of equivalent series resistance of LDO regulator.pdf
Understanding the load-transient response of LDOs.pdf
1998 IEEE Optimized Frequency Shaping Circuit Topologies for LDOs.pdf

semico_ljj

Understanding the Terms and Definitions of LDO Voltage Regulators
Bang S. Lee Mixed Signal Products
ABSTRACT
This report provides an understanding of the terms and definitions of low dropout (LDO)
voltage regulators, and describes fundamental concepts including dropout voltage,
quiescent current, standby current, efficiency, transient response, line/load regulation, power
supply rejection, output noise voltage, accuracy, and power dissipation. Each section
includes an example to increase the understandability.

semico_ljj

Understanding the stable range of equivalent series resistance of an LDO regulator
By Bang S. Lee
Application Specialist, Power Management
Series Pass Element

This application note
explores the stable range of
equivalent series resistance
(ESR) values for LDO
regulators. An ac model
of an LDO regulator is
presented to discuss the
LDO frequency response.
Both stable and unstable
ESR ranges are examined.

semico_ljj

1998 IEEE Optimized Frequency Shaping Circuit Topologies for LDOs

Abstract
Typical low drop-out (LDO) regulator architectures suffer from an inherent load regulation
performance limitation. This limitation manifests itself through limited dc open-loop gain and results from
stringent closed-loop bandwidth requirements. The frequency response of the system is highly sensitive
to the loading conditions thereby making proper compensation a laborious endeavor. This paper
discusses and addresses the limitation on regulating performance imposed by frequency compensation.
Several LDO circuit topologies are subsequently developed to this end. They enhance load regulation
performance by relaxing the dc open-loop gain restrictions. The circuit structures essentially alter the
frequency response of the system via the error amplifier. A low drop-out regulator adopting an
embodiment of the proposed technique was fabricated in the MOSIS 2 mm process technology. The
system, designed for an output capacitor of 4.7 mF, was stable with an equivalent series resistance
(ESR) ranging from 0 to 12 W, bypass capacitors adding from 0 to 2.2 mF, and a load-current ranging
from 0 to 50 mA.

moszheng

好！！这下变负翁了

zjhzboy100

全英文的，看起来太累了

tomandrosea

回复呀,挣钱

tomandrosea

看不到,就再次回复,谢谢楼主

hawk3130

偶不能看啊

hawk3130

啥时候能看啊