【经验】国产升压DC-DC SGM6623输出纹波过大的整改方案

时间： 2020-11-06 来源：世强

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某客户设计一款甲醛检测仪时需要将电池电压升压到12V给后级传感器供电，在实际测试时发现在输出5V空载时纹波较大，达到120mv，远远超过应用要求，本文主要通过设计经验提出几种降低纹波方案供客户参考整改。圣邦微的升压DC-DC SGM6623的应用电路如下：

客户在测试中发现当输出5V时纹波达到120mv，波形如下：

纹波简单来说就是输出直流之中夹杂的交流成分，在电源设计中是没有办法完全让纹波消失不见的，能做得就是尽量降低纹波电压。

最常见的手段是加大输出电感和输出电容，这个可以对输出端纹波进行减弱，因为根据电感内的电流波动大小和电感的电感量成反比，而增大输出电容容量会延缓充电时间，也就相当于减弱纹波；这种方法对纹波的减弱虽然有效，但是作用也是有限的，输出电容随着容量的增大，大到一定的程度后滤波效果就几乎不会有变化，所以这个方法可以对输出纹波有一定的改善，但是要根据实际情况测试分析。

第二就是增加2级滤波电路，就是在输出LC滤波之后增加一级LC滤波，效果和作用比第一种好很多，但是要考虑电压的采样点选择，如果采样点选择第一级L之后，那么会导致输出电压有所降低，如果采样点选择在第二级L之后，由于线路中包含第一级滤波线路，就有可能导致电源进入振荡现象，出现不稳定的情况。

以上就是常见的DC-DC输出纹波过大的解决办法分析，在实际应用要根据实际情况具体分析哪种方法最合适。

在本例中客户将输出电容Cout100uF更换为220uF，实际测试输出纹波为50mV，满足设计需求。

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本文由周宜龙提供，版权归世强硬创平台所有，非经授权，任何媒体、网站或个人不得转载，授权转载时须注明“来源：世强硬创平台”。

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描述- SGMICRO specializes in high-performance and high-quality analog and mixed-signal integrated circuits, and is committed to building a comprehensive portfolio of the highest quality analog and mixed-signal integrated circuits to address all customer needs.

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SGMICRO（圣邦微）信号链和电源管理芯片选型指南

目录- Company Profile Amplifiers Comparators Data Converters Voltage References Audio/Video Drivers Analog Switches Logic Ics Temperature Sensors RF Switches Supervisory Circuits LDOs System Power Management Ics Battery Management Ics LED Drivers LCD & OLED Display Powers and Drivers Switch Mode Power Ics Application-Specific Auxiliary Powers Motor/Gate Driver Index

型号- SGM61450,SGM3733B,SGM2558A,SGM5347-12,SGM2558B,SGM8261-5,SGM2564,SGM8261-1,SGM5347-10,SGM8261-2,SGM2549,SGM48017C,SGM72110,SGM8094,SGM836,SGM8091,SGM837,SGM61220,SGM8092,SGM8093,SGM835,SGM72108,SGM2553,SGM72106,SGM2555,SGM809B,SGM4519,SGM4517,SGM48018,SGM4518,SGM48010,SGM63600,SGM4520,SGM4521,SGM48005,SGM8417-4,SGM8417-2,SGM4051C,SGM48000,SGM48001,SGM48002,SGM3843A,SGM61433,SGM84782,SGM621,SGM58031,SGM620,SGM41600,SGM2572,SGM41603,SGM2571,SGM2574,SGM51622H,SGM4995,SGM4511,SGM4996,SGM4512,SGM2576,SGM2575,SGM4510,SGM2578,SGM4515,SGM4516,SGM8250-1,SGM8250-2,SGM4514,SGM3209,SGM809,SGM8557-3,SGM8557-1,SGM8557-2,SGM803,SGM61012,SGM804,SGM802,SGM61013,SGM810,SGM811,SGM4782,SGM7237B,SGM8902,SGM8903,SGM8904,SGM4542,SGM8905,SGM4548,SGM4549,SGM3699,SGM4546,SGM4547,SGM48013C,SGM62110,SGM61020,SGM62112,AAP6153A,SGM61022,SGM62111,SGM800,SGM2553/D,SGM2596,SGM3200,SGM3206,SGM8270-2,SGM3207,SGM4535,SGM3204,SGM8270-4,SGM8T245,SGM829,SGM61230,SGM42512,SGM41664,SGM825,SGM823,SGM61234,SGM824,SGM891B,SGM832,SGM42507,SGM42506,SGM830,SGM831,SGM4563,SGM40567,SGM4560,SGM42505,SGM4561,SGM6503,SGM4566,SGM6502,SGM8925,SGM6501,SGM8926,SGM4564,SGM8927,SGM5349-16,SGM6505,SGM4568,SGM6504,SGM8909,SGM890B,SGM816,SGM42501,SGM40565,SGM42500,SGM814,SGM815,SGM812,SGM40560,SGM40561,SGM821,SGM822,SGM820,SGM4551,SGM4552,SGM4550,SGM4555,SGM4556,SGM4553,SGM4554,FT2910,SGM8910,SGM5347-8,SGM4558,SGM11124F,74LVC2T45,SGM893B,SGM4581,SGM8941,SGM4582,SGM4583,SGM8704,SGM4588,SGM8705,SGM4589,SGM8706,SGM8707,SGM8942,SGM8701,SGM8702,SGM8703,SGM12213A,SGM892B,SGM6510,SGM8276-4,SGM4573,SGM3001,SGM4574,SGM42513,SGM6514,SGM6513,SGM3005,SGM4578,SGM6512,SGM8276-2,SGM3002,SGM42622B,SGM6511,SGM8276-1,SGM3003,SGM4576,SGMOP17C,SGM6518,SGM8931,SGM8932,SGM6516,SGM12214A,SGM8933,SGM6515,SGM8934,74AVC8T245,SGM3141B,SGM42553,SGM61031,SGM62116,SGM62115,SGM8953-1,SGM62118,SGM8953-2,SGM62117,SGM8708,SGM8709,SGM4075-2,SGM3140B,SGM4075-1,SGM42544,SGM7300A,SGM7300B,SGM42541,SGM42540,SGM8951,SGM8710,SGM8952,SGM5200,SGM38045,SGM38042,SGM6533,SGM8711,SGM8712,SGM8955,SGM38046,SGM8956,SGM8199L2,LM2904,SGM8199L1,SGM41002,SGM8968-4,SGM8968-2,LM2902,SGM8968-1,SGM8740,SGM8741,SGM8742,SGM8743,SGM8263-1,SGM8748,SGM8263-2,SGM8417-1,SGM8749,SGM8744,SGM40666B,SGM8745,SGM40666A,SGM8746,SGM8747,SGM41513D,SGM41513A,SGM42561,SGM42560,SGM8957-1,SGM8957-2,SGM42562,SGM5208-14,SGM5223,SGM48018C,SGM11102F,SGM41512A,SGM37603A,SGM8521,SGM8522,SGM5018,74LVTN16244,74LVTN16245,SGM8524,SGM8604-1,SGM11103F,SGM8193A3,SGM8604-5,SGM8193A2,SGM8604-2,SGM48019C,SGM8193A1,SGM8604-3,SGM8193A0,SGM37604A,SGM8751,SGM41007,SGM41008,SGM6332,SGM8750,SGM41280,SGM41281,SGM41283,SGM5353-16,SGM37891A,SGM41285,SGM41286,SGM8542,SGM51652H8,SGM8301,SGM8543,SGM8302,SGM8544,SGM8545,SGM51652H4,SGM8541,SGM8429C-4,SGM8304,SGM37892A,SGM8531,SGM8773,SGM8532,SGM8774,SGM8534,74LVTH125,SGM8770,SGM8771,SGM8772,SGM8535,SGM8536,SGM8537,SGM8538,SGM65230,74LVC2G04,SGM37893A,SGM65231,74LVC2G08,SGM65232,SGM8969-2,SGM8969-1,SGM2035C,SGM7232,SGM9128YP,SGM41291,SGM2036S,74LVC1G32Q,74LVC2G14,SGM13001C,SGM13001B,SGM2581E,74LVC138,SGM8958-2,SGM41295,SGM13001A,SGM8958-1,SGM7222,SGM6132,SGM8554,SGM7223,SGM8555,SGM7224,SGM6130,SGM8556,SGM2581C,SGM7220,SGM2581A,SGM8551,SGM8552,SGM7226,SGM7227,SGM7228,SGM7229,SGM44599,SGM8581,SGM7SZ32,SGM8713A-1,SGM8582,SGM6613A,SGM8584,SGM41282C,SGM8714B-1,SGM8924A,SGM58XXX,SGM5355-16,SGM7SZ19,74LVC1G125,SGM89000,SGM811B,SGM7SZ14,SGM48752X,SGM431VB,SGM2560A,SGM37603,SGM2560B,SGM6611C,SGM810B,SGM7SZ08,SGM7SZ04,SGM8591,SGM7SZ00,SGM8592,SGM9203,SGM6612A,SGM8594,SGM8922A,SGM4T245,SGM48753,SGM48754,SGM48755,SGM48756,SGM48757,SGM813B,SGM48759,74AVC4T245,SGM8140,SGM8141,SGM48751,SGM449,SGMNQ07430,SGM48752,SGM48510,SGM458,SGM3785S,SGM459,SGM457,SGM8142,SGM452,SGM450,SGM451,SGM37862,SGM37861,SGM812B,74GTL2005,SGM447,SGM448,SGM446,SGM7SZ244,SGM8478-1C,SGM7SZ245,SGM8139,SGM48537,SGM48538,SGM48539,SGM5351-16,SGM2588G,74LVCN16373,SGM2588E,SGM61032A,SGM2588K,SGM61032B,SGM2588I,SGM3712,SGM2588C,SGM3713,SGM3710,SGM2588A,SGM3711,SGM48523,SGM48524,SGM48525,SGM48526,SGM48760,SGM48520,SGM8557-5,SGM71XX,SGM706B,SGM3700,SGM3727,SGM3741B,SGM3725,SGM3726,SGMOP07,SGM898,SGM899,SGM896,SGM897,SGM895,SGM61030A,SGM61030B,SGM2566B,SGM4823,SGM3735,SGM3732,SGM2566A,SGM4822,SGM3716,SGM3740B,SGM4806,SGM3717,SGM3714,SGM3715,SGM4809,SGM4807,SGM3718,SGM4808,SGM3719,74LVC157,SGM48780,SGM48540,SGM37898,SGM51652H,SGM3720,SGM37891,SGM4812,SGM37892,SGM2567A,SGM4810,SGM37895,SGM3749,SGM3747,SGM3748,74LVTH16244,SGM72204A,SGMNQ40430,SGM432,74AHCT86,SGM431,SGM3752,SGM3753,SGM3750,SGM3756,SGM3757,SGM3755,SGM3738,SGM4825,SGM3736,SGM4826,SGM7SZ86,SGM3851A,SGM8198,SGM3741,SGM660,SGM3740,SGM3743,SGM41562B,SGM724,SGM72112B,SGM5209-14,SGM72112A,SGM2200,SGM4863,SGM2202,SGM2201,SGM2204,SGM2203,SGM2206,SGM4865,SGM2205,SGM3758,SGM3759,SGM8416-4,SGM722,SGM723,SGM721,SGM3760,SGM72004B,SGMNM45412,SGM8295-2,SGM8295-4,SGM8480-2,SGM2523C,SGM2523D,SGM2523A,SGM8295-1,SGM2523B,SGM3766,SGM4040B,SGM790A,SGM330A,SGM790B,SGM790C,SGM41100A,SGM41100V,SGM41100W,SGM2220,SGM8262-2,SGM8416-1,SGM2221

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

SGM6623YN6G/TR PcbLib & SchLib & IntLib

型号- SGM6623YN6G/TR

2024-05-23 - SGMICRO - CAD模型库代理服务技术支持现货查询批量订货

【方案】30~80kW组串式光伏逆变器优选器件方案

描述- 该方案针对30~80kW的组串式光伏逆变器，采用多路BOOST升压电路，减少光伏电池组件最佳工作点与逆变器不匹配的情况，最大程度增加发电量。逆变侧采用T型三电平拓扑，开关频率支持16kHz（最佳频率点），效率最高可达98.54%。辅助电源采用1700V耐压SiC MOSFET，单端反激电源可直接应用在1000V母线系统。同时，在BOOST升压电路和逆变电路中均采用IGBT模块设计，集成度更高。

型号- MKS4J022202D00MSSD,10-FZ12NMA080NS03-M260F,0505025.MX52LEP,TFLEX HD300,BGM111,C2M1000170D,EFR32MG13P732F512GM48-C,RBN75H125S1GP4-A0,10-FY12NMA160SH01-M820F18,KT05,PS9402,SGM6022,MLX91208,28R1101-000,28R0610-000,30-FT12NMA160SH-M669F28,PS9031,LSIC2SD120E30CC,30-FT12NMA200SH-M660F08,LXXXX 15.00/05/90 4.5SN GR,28R1476-100,92ML,LX 15.00/05/90 4.5SN GR BX,MKS4J033305D00KSSD,TPCM780,RC12-6-01LS,SMBJ18CA,28R1953-000,PS9531L3,SI86XX,28B0141-000,WDU50N,SGM6032,WGM110,R5F56514FDLJ,C4D30120D,WDU70N,RBN40H125S1GPQ-A0,C2M0080120D,V23990-P629-L43,SGM2019,LSIC1MO120E0080,SID11X2K,SI8261BCD-C-IS

WEIDMUELLER,LITTELFUSE,LAIRD,SILICON LABS,WIMA,RENESAS,VINCOTECH,STANDEX-MEDER,II-VI MARLOW,WOLFSPEED,PI,ROGERS,MELEXIS,SGMICRO - 优选器件方案 - V2.1

SGMicro（圣邦微） SGM6601低功耗DC-DC升压转换器数据手册

型号- SGM6601,SGM6601YTDI6G/TR,SGM6601YTN5G/TR

2012年4月26日 - SGMICRO - 数据手册代理服务技术支持现货查询批量订货

SGM6601 Low-Power DC-DC Boost Converter

型号- SGM6601,SGM6601YTDI6G/TR,SGM6601YTN5G/TR

JUNE 2022 - SGMICRO - 数据手册 - REV. A. 2 代理服务技术支持现货查询批量订货查看更多版本

【应用】升压DC/DC开关稳压器SGM6623YN6G/TR助力于电力监测仪表设计，开关频率高达600kHz

在某家电力监测仪表的产品设计中，需要一款BOOST DCDC给超级电容升压使用，1~2.7V输入电压，12V输出电压。本文就这个电力监测仪表的升压方案进行讨论，论述一个基于圣邦微的升压开关稳压器SGM6623YN6G/TR设计的方案的可行性。

2022-10-01 - 应用方案代理服务技术支持现货查询批量订货

SGM6623 4.4A, Miniature Boost Converter

型号- SGM6623,SGM6623YN6G/TR

OCTOBER 2022 - SGMICRO - 数据手册 - REV.A.4 代理服务技术支持现货查询批量订货查看更多版本

【应用】低功耗DC-DC升压转换器SGM6601YTN5G/TR用于智能吉他，最高输出电压38V

某客户做的一款智能吉他需要升压后经过低噪放LDO稳压得到超低噪声12V电源给音频运放供电。本文推荐采用的是SGMICRO推出的低功耗DC-DC升压转换器SGM6601YTN5G/TR，输入电压范围为1.8V~5.5V，可产生最高38V的电压输出。

2023-04-29 - 应用方案代理服务技术支持现货查询批量订货

基于EFM32JG/PG的智能手环低功耗整体解决方案，低功耗、小体积

智能手环方案可直接输出心率值，且具有低功耗、小体积等特点，是目前典型方案中的质优方案。

2017-05-25 - 方案

【选型】圣邦微小型升压DC/DC开关稳压器SGM6623可代换TI TLV61048，效率高达90%

本文详细分析、比对了圣邦微(SGMICRO)SGM6623代换TI的TLV61048的整个过程。由于二者误差取样电路中的内部基准电压不同（SGM6623：1.205｜TLV61048：0.8），两个取样电阻组成的分压比必须要调整。输出电流不大时可保留原储能电感，但最好按照SGM6623典型电路推荐值改动。

2021-08-19 - 器件选型代理服务技术支持现货查询批量订货

【应用】输入电压0.8V-12V的BOOST芯片满足燃气灶点火器需求，采用SOT23-6小封装

燃气灶这类灶具一般都是采用两节干电池进行供电，一节电池的标称电压为1.5V，满电电压为1.6V左右，放电截止电压通常为0.8V，因此两节干电池的电压范围是1.6V-3.2V。后端点火器供电电源为5V，因此需要一个合适的BOOST芯片用于电池电压升压到5V，本文推荐圣邦微BOOST芯片SGM6623。