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A configurable sawtooth based PWM generator with 2 ns on-time for >50 MHz DCDC converters

  • Size and cost of a switched mode power supply can be reduced by increasing the switching frequency. The maximum switching frequency and the maximum conversion ratio are limited by the duty cycle of a PWM signal. In DCDC converters, a sawtooth generator is the fundamental circuit block to generate the PWM signal. The presented PWM generator is based on two parallel, fully interleaved PWM generator stages, each containing an integrator based sawtooth generator and two 3-stage highspeed comparators. A digital multiplexing of the PWM signals of each stage eliminates the dependency of the minimum on-time on the large reset times of the sawtooth ramps. A separation of the references of the PWM comparators in both stage allows to configure the PWM generator for a DCDC converter operating in fixed frequency or in constant on-time mode, which requires an operation in a wide frequency range. The PWM generator was fabricated in an 180 nm HV BiCMOS technology, as part of a DCDC converter. Measurements confirm minimum possible ontime pulses as short as 2 ns and thus allows switching frequencies of DCDC converters of >50 MHz at small duty cycle of <10%. At moderate duty cycles switching frequencies up to 100 MHz are possible.

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Author of HS ReutlingenWittmann, Jürgen; Wicht, Bernhard
Erschienen in:2015 11th Conference on Ph.D. Research in Microelectronics and Electronics (PRIME) : June 29, 2015 - July 2, 2015
Place of publication:Piscataway, NJ
Document Type:Conference proceeding
Publication year:2015
Page Number:4
First Page:41
Last Page:44
DDC classes:621 Angewandte Physik
Open access?:Nein
Licence (German):License Logo  In Copyright - Urheberrechtlich geschützt