NDLI: Fully integrated high-efficiency high step-down ratio DC–DC buck converter with predictive over-current protection scheme

Content Provider	IET Digital Library
Author	Wang, Langyuan Zhao, Menglian Wu, Xiaobo Gong, Xiaohan Yang, Liuqing
Abstract	A high-efficiency fully integrated 36 V–3 A stepping down DC–DC converter with high step-down ratio and predictive over-current protection scheme is introduced. To achieve high-voltage conversion ratio, emulated current mode and dedicated current sensing circuits were involved. A novel predictive over-current scheme is proposed to overcome inherent lack of emulated current-mode control and provide fast response to over-current events. In addition, due to N-type field effect transistor (NFET) was adopted to improve efficiency, a floating rail regulator is presented to generate bootstrapped voltage for driver stage. The proposed converter was simulated and fabricated in 0.18 μm bipolar-complementary metal–oxide–semiconductor (MOS)-double-diffused MOS process. Experimental results show the features work well, and with 35 ns minimum on-time, this converter can convert up to 36 V input voltage to 1.8 V at 1 MHz switching frequency with single stage and compact solution. Measured peak efficiency is 89.5% and over 80% efficiency for 3 A output current is realised as well.
Starting Page	1959
Ending Page	1965
Page Count	7
ISSN	17554535
Volume Number	10
e-ISSN	17554543
Issue Number	Issue 14, Nov (2017)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-pel/10/14
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-pel.2017.0087
Journal	IET Power Electronics
Publisher Date	2017-07-27
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	BiCMOS Integrated Circuit Bipolar-complementary Metal-oxide-semiconductor Double-diffused MOS Process Bootstrapped Voltage Current 3 A Current Sensing Circuit DC-DC Power Converter Driver Circuit Driver Stage Emulated Current Mode Emulated Current-mode Control Floating Rail Regulator Frequency 1 MHz Fully Integrated High-efficiency High Step-down Ratio DC-DC Buck Converter High Step-down Ratio High-voltage Conversion Ratio Mixed Technology Integrated Circuit NFET Overcurrent Protection Power Electronics Power Supply Predictive Over-current Protection Scheme Size 0.18 Mum Supervisory Circuit Time 35 Ns Voltage 36 V
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

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