Cristiano Bazzani
Mindspeed Technologies
Network
Latest external collaboration on country level. Dive into details by clicking on the dots.
Publication
Featured researches published by Cristiano Bazzani.
IEEE Transactions on Power Electronics | 2014
Piero Malcovati; Massimiliano Belloni; Fabio Gozzini; Cristiano Bazzani; A. Baschirotto
This paper presents a buck-boost dc-dc converter for LED drivers capable of delivering an output current ranging from 0.1 to 2 A and a variable output voltage ranging between 2 and 5 V, starting from an input voltage spanning from 2.7 to 5.5 V. The dc-dc converter, realized in a 0.18-μm CMOS technology with 5-V option, occupies an area of 4 mm2 including pads. The circuit features automatic mode switching and dynamic sizing of the power transistors to achieve a peak efficiency of 91%. With a switching frequency of 2.5 MHz, the achieved line regulation is lower than 0.1% V-1 and the output voltage ripple is less than 10 mV. The obtained turn-on and load transient settling time are lower than 40 μs, thus allowing pulsed operation of the LEDs, as well as switching among LEDs of different colors.
international solid-state circuits conference | 2012
Piero Malcovati; Massimiliano Belloni; Fabio Gozzini; Cristiano Bazzani; A. Baschirotto
Several emerging portable applications require high-efficiency LED drivers [1-4]. An LED driver is basically a current source that forces the current required for achieving the desired light emission into the LED. In order to increase the LED driver efficiency, besides controlling the LED current, it is necessary to regulate the voltage applied to the LED itself, to minimize the voltage drop across the driver current source and, hence, the power consumption. Depending on the kind of LED and on the current forced through the LED itself (0.1 to 2A in this design) and, hence, on the desired light emission, the voltage required to drive the LED, while maintaining the voltage headroom across the driver current source to the minimum, varies over a wide range (0 to 5V). Starting from a standard voltage supply in the range 2.7 to 5.5V, a buck-boost DC-DC converter is then required (Fig. 16.4.1). The buck-boost DC-DC converter includes the LED in the control feedback loop and has to provide fast turn-on and load transients (on the order of 20μs), in order to allow pulsed operation of the LED itself.
Archive | 2007
Quazi Ikram; Cristiano Bazzani; Daniel Draper; Maurice M. Reintjes
Archive | 2009
Cristiano Bazzani; Daniel Draper
Archive | 2008
Cristiano Bazzani; Daniel Draper; Kevin B. Mcdonald
Archive | 2012
Cristiano Bazzani; Fabio Gozzini; Tao Chen
Archive | 2012
Massimiliano Belloni; Piero Malcovati; A. Baschirotto; Cristiano Bazzani
Archive | 2007
Christophe Neron; Cristiano Bazzani; Dario Soltesz; Ramakrishna Shivaram
Archive | 2006
Dario Soltesz; Cristiano Bazzani; Wim F. Cops
Archive | 2013
Cristiano Bazzani; Fabio Gozzini