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寻求一款电源芯片，输入24V，输出两路+12V，电压可调，正负输出电流1A以上，可用两个同样的芯片，但需要输出纹波及噪声在100mV左右，越小越好；
这个太多了
http://www.ti.com/lsds/ti/analog/powermanagement/power_portal.page#evaluate
