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本文提出一种用于车载收音机的单电感多输出(SIMO)DC-DC转换器，集成升压、降压和浮动输出电压功能，在汽车电池电压从4V到40V宽范围变化下实现86%的高效率。解决了Class-D音频功放供电需要稳定控制的问题。
Arunkumar Salimath1, Edoardo Bonizzoni1, Edoardo Botti2, Giovanni Gonano2, Paolo Cacciagrano2, Davide Luigi Brambilla2, Tommaso Barbieri2, Franco Maloberti1 University of Pavia, Pavia, Italy; 2STMicroelectronics, Cornaredo, Italy 1 The design of Class-D audio power amplifiers [1] for car radio is challenging because of the large voltage variation of the automotive battery. During crank and dump, the 14.4V battery voltage may sharply (in less than 2ms) drop down to 4V or rise up to 40V. For a proper operation, the supply voltages of the Class-D amplifier must be properly controlled for all the battery conditions. The block diagram of the Class-D power amplifier in Fig. 27.3.1 helps in defining the set of required supply voltages. The power audio stage uses n (n =1,…,4) channels of high and low-side switches both made by n-type transistors. The choice optimizes the on-resistance and the gate capacitance to achieve the best efficiency, but
Boost, One Buck, and a Floating Output Voltage for, Car-Radio