TY - JOUR
T1 - Pseudo-ramp current balance (PRCB) technique with offset cancellation control (OCC) in dual-phase DC-DC buck converter
AU - Su, Yi Ping
AU - Chen, Wei Chung
AU - Huang, Yu Ping
AU - Lee, Yu Huei
AU - Chen, Ke-Horng
AU - Luo, Hsin Yu
PY - 2014/10/1
Y1 - 2014/10/1
N2 - To cope with monolithic controller replicas and the current unbalance situation in multiphase converters, a pseudo-ramp current balance technique is proposed to achieve time-multiplexing current balance in voltage-mode multiphase DC-DC buck converter. With only one modulation controller, silicon area and power consumption caused by the replicas of controller can be reduced significantly. Current balance accuracy can be further enhanced since the mismatches between different controllers caused by process, voltage, and temperature variations are removed. Moreover, the offset cancellation control embedded in the current matching unit is used to eliminate intrinsic offset voltage existing at the operational transconductance amplifier for improved current balance. An explicit model, which contains both voltage and current balance loops with non-ideal effects, is derived for analyzing system stability. Experimental results show that current difference between each phase can be decreased by over 83% under both heavy and light load conditions.
AB - To cope with monolithic controller replicas and the current unbalance situation in multiphase converters, a pseudo-ramp current balance technique is proposed to achieve time-multiplexing current balance in voltage-mode multiphase DC-DC buck converter. With only one modulation controller, silicon area and power consumption caused by the replicas of controller can be reduced significantly. Current balance accuracy can be further enhanced since the mismatches between different controllers caused by process, voltage, and temperature variations are removed. Moreover, the offset cancellation control embedded in the current matching unit is used to eliminate intrinsic offset voltage existing at the operational transconductance amplifier for improved current balance. An explicit model, which contains both voltage and current balance loops with non-ideal effects, is derived for analyzing system stability. Experimental results show that current difference between each phase can be decreased by over 83% under both heavy and light load conditions.
KW - Offset cancellation control (OCC)
KW - Time-multiplexing (TM) current balance.
KW - pseudo-ramp current balance (PRCB)
KW - pulse frequency modulator (PFM)
KW - pulse width modulator (PWM)
KW - skipping modulator
UR - http://www.scopus.com/inward/record.url?scp=84907605917&partnerID=8YFLogxK
U2 - 10.1109/TVLSI.2013.2283606
DO - 10.1109/TVLSI.2013.2283606
M3 - Article
AN - SCOPUS:84907605917
VL - 22
SP - 2192
EP - 2205
JO - IEEE Transactions on Very Large Scale Integration (VLSI) Systems
JF - IEEE Transactions on Very Large Scale Integration (VLSI) Systems
SN - 1063-8210
IS - 10
ER -