DocumentCode :
1877565
Title :
A digitally controlled DC-DC buck converter using frequency domain ADCs
Author :
Ahmad, Hani ; Bakkaloglu, Bertan
Author_Institution :
Ira A Fulton Sch. of Eng., Arizona State Univ., Tempe, AZ, USA
fYear :
2010
fDate :
21-25 Feb. 2010
Firstpage :
1871
Lastpage :
1874
Abstract :
The design of a 0.18-¿m CMOS digital control architecture for a buck converter is presented. Several features are implemented. These include: 1) Frequency-domain digitization technique based on first-order non-feedback Sigma-Delta frequency Discriminators (NF-SDFD); 2) a robust arrangement for the feedback ADCs to guard against false output voltage variation due to temperature and process variation; 3) A new improved hybrid Digital Pulse Width Modulator (DPWM) architecture. The proposed system has additional attractive futures such simplicity, scalability, low power, close to all digital implementation in addition to its capability of satisfying tight regulation requirements for wide range of applications. An 8-bit ADC resolution is achieved with less than 110 ¿A current consumption. A 9-bit DPWM consumes around 370 ¿A. A 2% output voltage regulation accuracy is achieved with less than 10 mVpp ripple.
Keywords :
DC-DC power convertors; analogue-digital conversion; digital control; CMOS digital control architecture; digitally controlled DC-DC buck converter; first-order non-feedback sigma-delta frequency discriminators; frequency domain ADC; frequency-domain digitization technique; hybrid digital pulse width modulator architecture; output voltage regulation; size 0.18 mum; Buck converters; Delta-sigma modulation; Digital control; Frequency domain analysis; Output feedback; Pulse width modulation; Robustness; Space vector pulse width modulation; Temperature; Voltage;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Applied Power Electronics Conference and Exposition (APEC), 2010 Twenty-Fifth Annual IEEE
Conference_Location :
Palm Springs, CA
ISSN :
1048-2334
Print_ISBN :
978-1-4244-4782-4
Electronic_ISBN :
1048-2334
Type :
conf
DOI :
10.1109/APEC.2010.5433488
Filename :
5433488
Link To Document :
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