如果是输出pwm,用单片机或者振荡电路就可以了。如果是选择buck变换器,下面有很多种。 isl6525 -- buck and synchronous-rectifier pulse-width modulator (pwm) controller isl8105 -- 1v to 12v single-phase synchronous buck converter pwm controller with integrated mosfet gate drivers isl8105a -- 1v to 12v single-phase synchronous buck converter pwm controller with integrated mosfet gate drivers isl6522a -- buck and synchronous rectifier pulse-width modulator (pwm) controller isl6520b -- single synchronous buck pulse-width modul