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本文介绍了DC-DC电源的工作原理，包括PWM控制的斩波方式、不同工作模式（CCM、DCM、BCM）以及三种主要拓扑结构：BUCK（降压）、BOOST（升压）和BUCK-BOOST（升降压）。 4、 小结 BUCK降压电路通过 控制开关 管占空比实现电压转换，是现代 电子设备 中不可或缺的 电源 转换电路。 掌握BUCK电路的基本原理非常必要，它不仅是学习更复杂电源拓扑的基础，也是设计高效 稳定电源 系统的前提条件。 在设计BUCK电路时，需要根据实际应用场景选择合适的输入滤波电路、输出电容和电感等元器件，并根据输入电压、输出电压和负载电流等参数计算合适的元器件参数。
Buck 电路是嵌入式 / 硬件设计中最常用的非隔离型 DC-DC 降压转换器，核心功能是将输入高压直流（Vin）转换为更低的稳定直流输出（Vout < Vin），广泛应用于 STM32、MCU、传感器、电源模块等硬件设备中（如 5V 转 3.3V 给单片机供电、12V 转 5V 给 USB 设备供电）。一、核心原理（通俗版 + 专业版）1.Buck. Buck电路，又称降压电路，这是一种应用非常广泛的非隔离DC-DC转换电路，顾名思义，这种变换器只能降压。 基本拓扑如下图所示： 4 / 小结 / BUCK降压电路通过控制开关管占空比实现电压转换，是现代电子设备中不可或缺的 电源 转换电路。 掌握BUCK电路的基本原理非常必要，它不仅是学习更复杂电源拓扑的基础，也是设计高效稳定电源系统的前提条件。
BUCK电路是一种输出电压不大于输入电压的非隔离型直流-直流降压变换电路，通过开关器件的周期性通断实现电压转换。 其核心结构由开关管、电感、续流二极管和滤波电容构成，利用电感储能与释放的原理实现降压功能。
Buck电路，又称降压电路，其基本特征是DC-DC转换电路，输出电压低于输入电压。 输入电流为脉动的，输出电流为连续的。 He earns mega bucks (= a lot of money) working for an American bank. 他在一家美國銀行工作，賺錢很多。 So what's the best way to make a fast buck (= earn money easily and quickly)? 那麼，賺快錢的最好辦法是甚麽？ 本文将详细对DC-DC BUCK拓扑，进一步到DCDC芯片实际框图的各部分原理与参数选择等进行较为详细的说明，逻辑推论主要以工程推论为主，公式计算为辅，对实践设计有学习意义。
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