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开关功率放大器选型问题

需求:输入电压范围-2v—+2v,输出电流-2A—+2A,带宽要求;低通,低频至少250HZ,高频增益越小越好,负载特性,电阻约10欧姆,电感约3mH.另外要求开关功率放大器,功耗低点,输出的电流最好要有电流反馈,使得输出电流不因负载发生变化而发生变化。