High-performance error amplifier for fast transient DC-DC converters

A new error amplifier is presented for fast transient response of dc-dc converters. The amplifier has low quiescent current to achieve high power conversion efficiency, but it can supply sufficient current during large-signal operation. Two comparators detect large-signal variations, and turn on ext...

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Bibliographic Details
Published in:IEEE transactions on circuits and systems. 2, Analog and digital signal processing Analog and digital signal processing, 2005-09, Vol.52 (9), p.591-595
Main Author: Roh, Jeongjin
Format: Article
Language:English
Subjects:
Boost converter
Circuit stability
dc-dc converter
error amplifier
Latches
Operational amplifiers
operational transconductance amplifier (OTA)
Pulse amplifiers
Pulse width modulation
Pulse width modulation converters
pulsewidth modulation (PWM)
Stability analysis
Switching converters
Transient response
Voltage
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Description
Summary:A new error amplifier is presented for fast transient response of dc-dc converters. The amplifier has low quiescent current to achieve high power conversion efficiency, but it can supply sufficient current during large-signal operation. Two comparators detect large-signal variations, and turn on extra current supplier if necessary. The amount of extra current is well controlled, so that the system stability can be guaranteed in various operating conditions. The simulation results show that the new error amplifier achieves significant improvement in transient response than the conventional one.
ISSN:1549-7747
1057-7130
1558-3791
DOI:10.1109/TCSII.2005.850521