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求一个电路,可调输出电压12V到24V,输出电流在1.5A左右

2025-03-16 08:41:37

推荐回答（2个）

回答1：

用线性稳压器不仅在输入-输出电压差大的时候效率低下发热严重，而且它们都不可能输出电压和输入电压相等。例如LM317，输入24V，输出最高也不会高于22V。

应该用具有升/降压功能的开关稳压器例如CS5171、CS5173，这款开关稳压稳压器的工作电压范围是2.7V~30V，最大输出电流1.5A。实用电路如下图（调整当比例电阻R1和R2的阻值比例就可以改变输出电压，当R1和R2的阻值之比为1:8.375时输出电压为12V，当R3和R2的阻值之比为1:17.75时输出电压为24V）——

回答2：

必须加散热片

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