【经验】浅谈BUCK电路占空比与效率之间的关系

时间： 2019-08-29 来源：世强

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BUCK电路即DCDC开关型降压电路，被广泛应用于各种产品中，如便携式仪器、无线设备等等。在实际设计中，对于BUCK电路的效率要求当然是越高越好，通过查阅DCDC BUCK芯片数据手册会发现，效率越高，其占空比参数也会越大，本文就解释下这种现象的原因。

BUCK电路原理图

关于此现象，有如下几点原因：

1、首先，我们先列出BUCK电路的占空比（D）计算公式,根据伏秒积平衡原理,VIN*TON=VO*TOFF，得出占空比D= Vo/Vin，在输出电压一定的情况下，若占空比越大，Vin会越小，即开关管和电感L上压降越小，在开关管和电感L上损耗越小，所以电路效率就越高；

2、正常工作时，开关管导通，输入电源直接向输出提供电能，占空比越大，提供的电能越多，除了输出负载消耗以外，其他多余能量储存在电感L中，在开关管断开后，直接由电感向输出供电，无需电磁转换消耗，所以相应电路的效率也就提高了。

因此，我们可以得到一个结论：BUCK电路占空比越大，效率越高。

作为中国IC设计公司之一、模拟集成电路领导者——圣邦微，其DCDC降压芯片 SGM6012在低压差下，占空比可以达到100%，效率高达到95%，另外，在如下典型应用电路中，其内置续流管不仅可以减少外围电路器件，还可以使产品在效率性能方面表现优异。

SGM6012典型应用电路

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2023/4/7 - SGMICRO - 选型指南代理服务技术支持现货查询批量订货

SGMICRO DC/DC转换器选型表

SGMICRO DC/DC转换器选型表包含包含同步整流降压转换器、AMOLED显示屏电源降压、非同步降压转换器升压、同步整流升压转换器、非同步升压转换器、电荷泵DC/DC转换器、专用DC/DC转换器和LCM偏置电源；升降压、电荷泵供电，最大输入电压60V，最大开关电流10A，内置MOS。

产品型号	品类	CH	Enable	Vcc (Min)(V)	Vcc (Max)(V)	I_OUT(mA)	Frequency (kHz)	Iq (μA)	SHDN Iq(μA)	Package
SGM6010	DC/DC Synchronous Rectifier Buck Converters	1	L	3	5.5	3000	300 to 2000	0.41	2	TDFN-3×3-10L

选型表 - SGMICRO 立即选型

【应用】国产小封装升降压DCDC SGM62117C助力10G PON光模块，芯片转换效率高达90%

某客户的光模块方案设计需使用一颗电源芯片去控制TEC工作，选型要求芯片体积小并且支持高效率，结合客户的实际需求，本文推荐国产圣邦微电子SGMICRO推出的小封装升降压DCDC SGM62117，转换效率高达90%，静态电流仅为18μA。

2023-06-29 - 应用方案代理服务技术支持现货查询批量订货

【选型】国产DCDC升降压芯片SGM62112可PTP兼容TPS63000，助力光模块电源设计

在大数据时代，光模块已成为市场上的中坚力量，高速光模块需求量增长迅猛，常用的是TI的TPS63000。因为国产化需求，需要寻找一款可以替代的国产DCDC降压芯片，本文主要介绍SGMICRO SGM62112可P2P兼容TPS63000，作为备选方案。

2022-01-13 - 器件选型代理服务技术支持现货查询批量订货

【应用】同步升降压DCDC SGM62112无线温湿度传感器，静态电流小于55μA保证产品长久续航

笔者给客户的无线温湿度传感器项目推荐了SGMICRO（圣邦微）的同步升降压DCDC SGM62112，一颗芯片即可实现产品的供电，大大节省了成本和板子空间，也使得产品的功耗更低。经过客户实测，SGM62112非常契合他们产品，后续会将SGM62112设计进去。

2023-06-27 - 应用方案代理服务技术支持现货查询批量订货

【应用】圣邦微DCDC同步降压芯片SGM61230XTN6G/TR应用于FTU，具有输入电压宽，封装体积小等特点

FTU通过互感器采集到的电压电流信号，经ADC处理后进入MCU进行分析，最后将数据通过4G/5G模组进行上传，可远程进行监控，并遥控继电器进行分合网操作。内部供电由DCDC降压芯片及LDO来完成，这里推荐SGM61230XTN6G/TR DCDC同步降压芯片。

2023-02-05 - 应用方案代理服务技术支持现货查询批量订货

【应用】超小封装的降压DCDC芯片SGM61006助力10G XGSCOMBO PON光模块产品设计，负载可达0.6A

某客户在设计一款10G XGSCOMBO PON光模块项目时，由于此模块封装为SFP+封装，项目设计只有一块PCB，所以布板面积非常进展，此项目设计需使用一颗降压DCDC，结合客户实际需求本文推荐国产圣邦微电子小封装降压DCDC SGM61006。

2023-05-31 - 应用方案代理服务技术支持现货查询批量订货

【选型】国产降压电源芯片SGM61133助力机顶盒，可P2P兼容MPS的MP1652/MP1653

在机顶盒电源部分设计时，外部适配器输出DC12V，需要降压DCDC转为5V为后级供电。之前不少厂家会选择MPS的MP1652或MP1653，但随着国产化低成本压力越来越大，急需一颗高性价比替换料。本文推荐国产圣邦微降压电源芯片SGM61133做替换。

2020-10-21 - 器件选型代理服务技术支持现货查询批量订货

SGMicro（圣邦微） SGM6012同步降压转换器数据手册

型号- SGM6012-3.3YTN5G/TR,SGM6012,SGM6012-ADJYTN5G/TR,SGM6012-1.8YTN5G/TR,SGM6012-1.2YTN5G/TR

2016年03月01日 - SGMICRO - 数据手册 - REV.A. 1 代理服务技术支持现货查询批量订货

【应用】国产升降压电源管理芯片SGM62112助力工业类设计，内置MOS且效率高达96%

圣邦微 (SGMICRO）SGM62112是一款升降压电源管理芯片，该产品可延长单节锂离子电池供电的多媒体设备的电池使用寿命。DCDC转换器可输入1.8V~5.5V的宽电压范围内实现高达96%的效率，并能够输出范围固定及可调节的1.2V ~5.5V/1.2A 的电压。

2022-03-09 - 应用方案代理服务技术支持现货查询批量订货

【选型】智能手环用降压DCDC芯片推荐SGM6029系列，具有超低静态电流2.3μA、可控的工作模式

某客户的智能手环项目中，需要用到一颗超低静态电流的DCDC进行降压，将两颗纽扣电池3V电压降至1.8V，电流500mA MAX，需要小封装与低静态电流。故，推荐圣邦微SGM6029系列。

2023-04-08 - 器件选型代理服务技术支持现货查询批量订货

【经验】PFM模式对SGM6033 DCDC降压电源芯片的输出纹波有影响吗？

SGM6032/SGM6033是圣邦微推出的高性价比DCDC降压电源方案，电压输入范围2.5-5.5V，输出电压可调，主频4.6Mhz，负载能力1A，SGM6032/3具有低功耗模式，当电流较小的时候，会转为PFM模式下工作，对于市面上部分电源芯片来说，PFM模式意味着纹波系数大，本文通过实际测试，来了解SGM6033的PFM模式。