Design and Implementation of a Sliding-Mode Controller for Low-Dropout/Linear Regulator

This brief presents an approach to utilize of sliding-mode (SM) controller in digital low-dropout/linear regulators. Various design aspects, including the extraction of the regulator state-space model and sliding coefficients by considering the hitting, existence, and stability conditions are descri...

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Bibliographic Details
Published in:IEEE transactions on circuits and systems. II, Express briefs Express briefs, 2018-12, Vol.65 (12), p.1889-1893
Main Authors: Bagheri, Javad, Saberkari, Alireza, Khorgami, Omid, Alarcon-Cot, Eduard
Format: Article
Language:English
Subjects:
Capacitors
Change detection
Circuit boards
Circuits
Clocks
Control stability
Current feedback amplifiers
Current-mode
digital LDO
Integrated circuits
Limit cycle oscillations
linear regulator
low-dropout
nonlinear control
Printed circuits
Regulators
Shift registers
Sliding mode control
sliding-mode
State space models
Trajectory
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Summary:This brief presents an approach to utilize of sliding-mode (SM) controller in digital low-dropout/linear regulators. Various design aspects, including the extraction of the regulator state-space model and sliding coefficients by considering the hitting, existence, and stability conditions are described. Moreover, the freeze control block is introduced as a solution to compensate for the high frequency chattering phenomenon of SM, resulting in reduction of switching losses. In order to verify the statements, a quasi digital low-dropout/linear regulator is implemented in a discrete form on a PCB. The circuit consists of the proposed current-mode current feedback amplifier-based SM controller and switched-mode pMOS array driven by a bidirectional serial shift register, which is controlled by the SM controller. The results reveal that the controller detects the load changes rapidly, and eliminates the output limit-cycle oscillation, providing a robust and stable output voltage.
ISSN:1549-7747
1558-3791
DOI:10.1109/TCSII.2018.2817482