【经验】离线式线性稳压器KP3310输出纹波过大问题分析
必易微电子KP3310是一款紧凑型无电感设计的离线式线性稳压器。用于取代传统的阻容降压方案，具有很多优点：超低系统成本，无电感、大电解电容设计；外围电路极简，典型电路只需3个器件；支持全压输入，85 - 264Vac；小于35mW待机功耗，低纹波、低EMC噪声等。
某客户在测试时，发现输出电压纹波较大，达到50mV，如图为搭建的电路板：
因KP3310内部是LDO输出的，纹波非常小，通常情况下小于10mV。初步分析怀疑为纹波测试探头设置不当带出来的纹波。经沟通，给客户提供了电压纹波测试方法，客户重新测试后发现输出电压纹波得到明显改善。如下为输出电压纹波测量优化方案：
1.处理示波器电压探头
将电压探头上的长接地夹头拔掉，装上纹波测试接地弹簧针头，注意接地针头长度小于1cm，且针头接触良好。因为原装的探头地线过长，测试时形成的环路面积大，容易引入外部干扰，造成测试结果失真。如图为改善后的电压探头：
2.调节示波器设置：
将示波器探头配置设为：“AC”交流耦合、“20MHz”带宽、测量项选为“峰-峰值”、时间标度调整为20ms或20μs。原理：限制示波器20MHz带宽目的，是为了消除数字电路的高频噪声影响，尽量保证测量的准确性。
经验总结：输出电压纹波测量，为避免引入外部干扰，需要注意两个方面：1、调整缩短示波器探头地线；2、设置示波器为20MHz带宽。
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本文由李昌胜提供，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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必易微ACDC产品选型表
必易微提供以下技术参数型号为PN级的AC-DC产品选型，包含LLC 控制器,PFC 控制器,PFC 转换器,PSR 控制器,PSR 转换器,SR 控制器,SR 转换器,SSR 控制器,SSR 转换器,电池监控保护器,非隔离控制器,非隔离转换器,高压智能线性稳压器等，具有CV、CC&CV、CP&CV多种输出特性，低压&高压以及电阻启动方式，Buck/Buck-Boost/Flyback等多种拓扑电路结构，六级能效标准，待机功耗最低可＜20mW。必易微ACDC产品具有SOP-7、DIP-7、SOT23-6等多种封装，具体下单型号可参考产品数据手册。
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产品型号
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品类
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封装
|
拓扑电路
|
最大功率(W)
|
工作模式
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最高频率(kHz)
|
输出特性
|
启动方式
|
能效标准
|
待机功耗(mW)
|
VDDmax(V)
|
|
KP212
|
PSR 控制器
|
SOT23-6
|
Buck/Flyback
|
65
|
DCM
|
70
|
CC&CV
|
电阻启动
|
六级
|
<75
|
30
|
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型号- KP2190,KP311AWPA,KP20H,KP3281DP,KP2191,KP4110-1-2,KP2192,KP212,KP86888,KP3116WPA,KP2501,KP86884,KP206A,KP216,KP3210BSGA,KP206B,KP214,KP3224DP,KP3205SGA,KP3310,KP3126SG,KP23111,KP2182,KP23110,KP101,KP201E-H,KP15026VPA,KP86888S,KP3110-2-4-6,KP201A-H,KP3116SGA,KP22306,KP322XDP,KP216X,KP15012SPA,KP23132M,KM8684NQ,KP3221DP,KP3282DP,KP15026,KP3310DPA,KP3210-1-2B,KP3211BDP,KP2201-B,KP2326,KM868X,KP1513,KP3114WPA,KP146X,KP2164,KP206A-B,KP2162,KP2202,KP3120SPA,KP2161,KP201,KP18026,KP15026WPA,KP3112LGA,KP214X,KP2182X,KP206,KP3114SGA,KM8688NQ,KP4055,KM8684NS,KP3126,KP226X,KP2061-4,KP23266,KP15014SPA,KP23264,KP4051,KP201-E-F,KP1511X,KP3210SGA,KP322X,KP201X,KP321ABSGA,KP3110,KP3222DP,KP1452,KP3221SG,KP4124X,KP2313X,KP201H,KP23133M,KP201F,KP18051ESPA,KP41242,KP3211BSGA,KP41240,KP41241,KP23152,KP15012-4,KP3210BDP,KP23151,KP201A,KP23150,KP1512X,KP201E,KP201B,KP201C,KP212X,KP36673-4,KP35015,KP3221SGA,KP2010,KP2131,KP3310SPA,KP3112SGA,KP2011,KP2132,KP2130,KP2012,KP2013,KP3284DP,KP3126SGA,KP18061ESPA,KP1315X,KP3110SPA,KP2126,KP4050-A,KP18055ESPA,KP2801,KP142X,KP1030,KP2120,KP2124,KP328X,KP2122,KP311ALGA,KP23133,KP18069,KP23132,KP3212BDP,KP226XH,KP41240-1-2,KP141X,KP401,KP2591,KP21821-2-4,KP206X
LED照明驱动产品介绍
型号- KP18001WPA,KP1079XWPA,KP15062SPA,KP421LGA,KP1271FNSPA,KP116SPA,KP15113SPA,KP1162SPA,KP1511SPA,KP1313X,KP14654DP,KP1271FCSPA,KP1191SPA,KP14653SPA,KP1222SPA,KP3310,KP10772WPA,KP1255,KP107LSPA,KP119SPA,KP1325SPA,KP3310DP,KP1505ASPA,KP1059BWPA,KP15026VPA,KP123X,KP1199BWPA,KP1466SPA,KP106,KP122SPA,KP1273FCSPA,KP13134DP,KP107W,KP119X,KP10790WPA,KP107L,KP15114DP,KP18011,KP1234SPA,KP18011ESPA,KP15026,KP1272FHSPA,KP15111SPA,KP1511,KP1059AWPA,KP107WSPA,KP15051SPA,KP1465SPA,KP10770WPA,KP4500,KP1077XWPA,KP1164MSPA,KP14663CSPA,KP107XL,KP15114SPA,KP1272FCSPA,KP1272FNSPA,KP13135DP,KP14652SPA,KP10792WPA,KP1192DP,KP18108WPA,KP18002FESPA,KP1079AWPA,KP1274FHSPA,KP1255SPA,KP1262FCWPA,KP1511X,KP1313LGA,KP3310SGA,KP1263FCWPA,KP1059CWPA,KP1466X,KP106SPA,KP1501AVPA,KP12353SPA,KP10791WPA,KP116X,KP14652DP,KP4213ESGA,KP1220SPA,KP127XFC,KP1274FNDP,KP421SPA,KP12762FWPA,KP127XFN,KP1192SP,KP1325,KP1501A,KP15052SPA,S4223,KP1193DP,KP126XFCWPA,KP15114HSPA,KP18062ESPA,KP1274FNSPA,KP1272FNDP,KP15062,KP14664MSPA,KP18106WPA,KP15064,KP1276XFWPA,KP1164SPA,KP18061ESPA,KP1274FCSPA,KP14653DP,KP1199AWPA,KP18055ESPA,KP123SPA,KP14651SPA,KP12761FWPA,KP4500SGA,KP1077AWPA,KP14662SPA,KP1805X,KP1261FCWPA,KP1806XWPA,KP14662CSPA,KP1059XWPA,KP1465X,KP1194DP,KP1221SPA,KP12354SPA,KP15064SPA,KP18053ESPA,KP10771WPA
必易微LED芯片选型表
必易微提供以下技术参数LED产品的选型，MOS耐压：40V-600V，导通阻抗:0.25Ω-18Ω，工作模式：临界连续、开关、断续、Linear
|
产品型号
|
品类
|
Package
|
PF
|
MOSFET Rdson
|
MOSFET Vds
|
Isolated Non-Iso
|
Topology
|
OTP Internal
|
OVP Internal
|
OVP External
|
OCP
|
mini output voltage
|
Iout Vin=176-264Vac 72Vout
|
|
KP1054AVPA
|
LED芯片
|
SOP-4
|
0.5
|
18Ω
|
500V
|
Y
|
buck
|
Y
|
N
|
N
|
Y
|
15V
|
110mA
|
选型表 - 必易微 立即选型
【产品】紧凑型无电感设计的离线式线性稳压器KP3310，5V/3.3V/2.7V输出电压
必易微电子推出的KP3310是一款紧凑型无电感设计的离线式线性稳压器，通过调整SEL管脚阻值，KP3310有5V/3.3V/2.7V三档输出电压可选，是一种简单可靠的获得偏置供电的离线式电源解决方案。
新产品 发布时间 : 2020-09-05
【应用】国产无电感ACDC KP3310可取代传统阻容降压方案，外围极简、输出稳定
将交流市电转换为低压直流的常规方法是采用变压器降压后再整流滤波，当受体积和成本等因素的限制时，最简单实用的方法就是采用阻容降压式电源。本文对比传统阻容降压与必易微电子KP3310方案做对比，分析用KP3310无电感ACDC方案去取代传统阻容降压方案的优势。
应用方案 发布时间 : 2021-03-17
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可定制变压器电压最高4.5KV，高频30MHz；支持平面变压器、平板变压器、OBC变压器、DCDC变压器、PLC信号变压器、3D电源、电流变压器、反激变压器、直流直流变压器、车载充电器变压器、门极驱动变压器等产品定制。
最小起订量： 100000 提交需求>
支持1拖1/1拖8/eMMC离线烧录，可烧录IC类型：UFS/UMCP/MCU/MPU/EPROM/EEPROM/FLASH/Nand Flash/PLD/CPLD/SD Card/TF Card/ CF Card/eMMC Card/eMMC/eMCP/MoviNand/OneNand等；IC包装Tray/Tube/Tape；提供免费10pcs样品试样。
最小起订量： 1 提交需求>
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