TY - JOUR
T1 - A 95.2% Efficiency DC-DC Boost Converter Using Peak Current Fast Feedback Control (PFFC) for Improved Load Transient Response
AU - Alevoor, Shashank
AU - Nayak, Rakshit Dambe
AU - Talele, Bhushan
AU - Ray, Abhishek
AU - Rutkowski, Joseph D.
AU - Stockstad, Troy
AU - Bakkaloglu, Bertan
N1 - Publisher Copyright:
© 2004-2012 IEEE.
PY - 2023/3/1
Y1 - 2023/3/1
N2 - The load transient response and unity gain bandwidth of DC-DC boost converters are primarily restricted by the presence of a right half plane zero (RHPZ). In this paper, a control scheme termed peak current fast feedback control (PFFC) is proposed to improve the load transient response without the need for additional power switches or passive components. In the proposed PFFC method, the closed loop output impedance (ZOCL) is improved by reducing the DC value and by increasing the bandwidth of ZOCL as compared to conventional peak current mode control (CPCM), thus improving the steady state and transient performance. The fast feedback (FFB) path is implemented within the error amplifier (EA) with an increase of only 2% in the active area as compared to CPCM. The boost converter is designed for VOUT =5V, VIN =2.5V -4.4V and ILOAD =10 mA-1A operating at a fixed frequency of 2MHz. Measurement results show that with PFFC enabled, the settling time reduces by ∼ 2.6× and the undershoot reduces by 62% to 12μs and 41mV respectively when compared to CPCM for 10mA to 1A load step at 2A/μs. The converter achieves a peak efficiency of 95.2% at 0.5W output power with VIN =4.4V and load regulation of 9mV/A at VIN =2.5V.
AB - The load transient response and unity gain bandwidth of DC-DC boost converters are primarily restricted by the presence of a right half plane zero (RHPZ). In this paper, a control scheme termed peak current fast feedback control (PFFC) is proposed to improve the load transient response without the need for additional power switches or passive components. In the proposed PFFC method, the closed loop output impedance (ZOCL) is improved by reducing the DC value and by increasing the bandwidth of ZOCL as compared to conventional peak current mode control (CPCM), thus improving the steady state and transient performance. The fast feedback (FFB) path is implemented within the error amplifier (EA) with an increase of only 2% in the active area as compared to CPCM. The boost converter is designed for VOUT =5V, VIN =2.5V -4.4V and ILOAD =10 mA-1A operating at a fixed frequency of 2MHz. Measurement results show that with PFFC enabled, the settling time reduces by ∼ 2.6× and the undershoot reduces by 62% to 12μs and 41mV respectively when compared to CPCM for 10mA to 1A load step at 2A/μs. The converter achieves a peak efficiency of 95.2% at 0.5W output power with VIN =4.4V and load regulation of 9mV/A at VIN =2.5V.
KW - Boost converter
KW - fast load transient response
KW - peak current fast feedback control (PFFC)
KW - right-half-plane zero (RHPZ)
KW - slew-rate controlled driver
UR - http://www.scopus.com/inward/record.url?scp=85146254298&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85146254298&partnerID=8YFLogxK
U2 - 10.1109/TCSI.2022.3227901
DO - 10.1109/TCSI.2022.3227901
M3 - Article
AN - SCOPUS:85146254298
SN - 1549-8328
VL - 70
SP - 1097
EP - 1109
JO - IEEE Transactions on Circuits and Systems I: Regular Papers
JF - IEEE Transactions on Circuits and Systems I: Regular Papers
IS - 3
ER -