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A 10 MHz, 48-to-5V synchronous converter with dead time enabled 125 ps resolution zero-voltage switching

  • An integrated synchronous buck converter with a high resolution dead time control for input voltages up to 48V and 10MHz switching frequency is presented. The benefit of an enhanced dead time control at light loads to enable zero voltage switching at both the high-side and low-side switch at low output load is studied. This way, compact multi-MHz DCDC converters can be implemented at high efficiency over a wide load current range. The concept also eliminates body diode forward conduction losses and minimizes reverse recovery losses. A dead time resolution of 125 ps is realized by an 8-bit differential delay chain. A further efficiency enhancement by soft switching at the high-side switch at light load is achieved with a voltage boost of the switching node by dead time control in forced continuous conduction mode. The monolithic converter is implemented in an 180nm high-voltage BiCMOS technology. At V IN = 48V, V OUT = 5V, 50mA load, 10MHz switching frequency and 500 nH output inductance, the efficiency is measured to be increased by 14.4% compared to a conventional predictive dead time control. A peak efficiency of 80.9% is achieved at 12V input.

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Author of HS ReutlingenWittmann, Jürgen; Wicht, Bernhard
Erschienen in:APEC 2016 : thirty first Annual IEEE Applied Power Electronics Conference and Exposition : March 20 - 24, 2016, Long Beach Convention Center, Long Beach, California
Place of publication:Piscataway, NJ
Document Type:Conference proceeding
Publication year:2016
Page Number:5
First Page:106
Last Page:110
DDC classes:620 Ingenieurwissenschaften und Maschinenbau
Open access?:Nein
Licence (German):License Logo  In Copyright - Urheberrechtlich geschützt