【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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产品型号
|
品类
|
封装
|
拓扑电路
|
最大功率(W)
|
工作模式
|
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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LED照明驱动产品介绍
描述- 本资料介绍了必易微电子的LED照明驱动产品,涵盖光源类、灯具类、调光类和辅电及恒压产品。产品包括新一代全集成方案、高PF非隔离产品、HPF CV BOOST、LPF QR FLYBACK、HPF CC BOOST、HPF 高精度CC BUCK、HPF 高精度CC BUCK等。资料详细介绍了各产品的特点、应用电路和性能参数。
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
KP3310 离线式、无电感交流输入线性稳压器
描述- 本资料介绍了KP3310离线式无电感交流输入线性稳压器,其具有高精度输出电压、宽输入电压范围、无需功率电感和高压电容等特点,适用于小家电电源和墙壁开关调光器等领域。
型号- KP3310
【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。
【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。
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
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Package
|
PF
|
MOSFET Rdson
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MOSFET Vds
|
Isolated Non-Iso
|
Topology
|
OTP Internal
|
OVP Internal
|
OVP External
|
OCP
|
mini output voltage
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Iout Vin=176-264Vac 72Vout
|
KP1054AVPA
|
LED芯片
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SOP-4
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0.5
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18Ω
|
500V
|
Y
|
buck
|
Y
|
N
|
N
|
Y
|
15V
|
110mA
|
选型表 - 必易微 立即选型
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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>
可定制平板变压器、主变压器的开关频率2MHz以内、输入电压1400V以内、输出电压1400V以内,50%以上的产品采用自动化生产,最快3天提供样品、7天交货。
最小起订量: 3000 提交需求>
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