【经验】必易微PWM控制功率开关KP3211用于音响开关电源无输出异常分析

时间： 2022-01-05 来源：世强

代理服务

技术支持

现货查询

批量订货

必易微电子KP321XB系列是一款高性能低成本PWM控制功率开关，适用于离线式小功率降压型应用场合，外围电路简单、器件个数少。同时产品内置650V高耐压MOSFET可提高系统浪涌耐受能力。支持降压和升降压拓扑，默认12V输出(FB脚悬空)，待机功耗<50mW。

某客户在音响开关电源上选用了KP3211，客户设计的输出电压为15V，输出电流在500mA以下。将电路通电后，发现没有输出电压，客户反馈给世强分析原因。如下为原理图：

分析如下：

1、与客户沟通先检查电路元件的选用是否正确，如检查有极性电容和二极管的极性是否焊反，确认元件的选值（感量、阻值、容值等）是否符合设计要求；检查是否有漏焊、虚焊、短路现象，检查元件外观是否有烧毁变色的痕迹。客户检查确认后回复没有问题。

2、与客户沟通更换新的芯片、电感后，问题依旧，还是没有输出。

3、仔细检查电路图，注意到输出端有并了一个18K的电阻作为假负载。怀疑可能假负载太大，电路还未建立稳定工作，建议客户在输出端再并一个3K的电阻，由此总假负载值在3K以下，未带载时也有输出3mA左右的电流以利建立稳定工作输出。客户按此建议降低假负载值后，电路工作正常。

发送到邮箱 |
+1 赞 0
收藏
评论 0
| 转发至：

本文由Dannyli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”。

全部评论（0）

暂无评论

【经验】使用必易微PWM控制功率开关KP3210BSGA观察和理解DCDC的应用和性能

很多开发设计者在设计电路原理图之前首先会考虑电源部分选用和设计验证；为了方便设计则观察和理解一个DCDC的应用和性能；本验证方案选用了必易微的一颗PWM控制功率开关KP3210BSGA来看看他的性能。

2022-10-19 - 设计经验代理服务技术支持现货查询批量订货

【经验】开关电源PCB上去耦电容的容值选择及摆放位置对输出纹波的影响

某客户智慧用电项目中使用必易微电子的PWM控制功率开关KP3211B设计一款10W开关电源作为主控板的输入源，输出12V/800mA，第二级电路使用一颗宽压LDO为MCU提供供电电压。在实际测试中发现12V输出纹波较大导致后级电路工作不稳定。本文就将分析该问题产生的原因

2020-11-13 - 设计经验

【经验】必易微原边控制器KP2122MSGA重载条件下无法启动问题分析

某用户用必易微的原边控制器KP2122MSGA做12W（12V/1A）方案，AC220下输出12W，85~265AC输出10W，调试中出现芯片无法重载正常工作，本文将分析并给出建议。

2022-12-20 - 设计经验代理服务技术支持现货查询批量订货

必易微（KIWI）LED驱动IC选型指南

目录- 非隔离和隔离产品智能调光、可控硅调光产品非隔离恒压和隔离恒压产品 DC-DC和电机产品线性、去纹波产品 LED照明方案介绍

型号- KP18032,KP1271FNQ,KP13262,KP1078CL,KP13264,KP10790,KP10791,KP10792,KP1078CH,KP1313X,KP16014A,KP1325X,KP523302,KP2591A,KP1326A,KP1079A,KP523308,KP2182,KP1078DH,KP21822M,KP1402,KP85302,KP107W,KP119X,KP1076C,KP107L,KP1071CL,KP23132M,KP107Q,KP10780L,KP1078AH,KP1511,KP421X,KP523201A,KP35026,KP1078AL,KP1074,KP1073,KP1194,KP2816X,KP10781H,KP1076,KP1077A,KP2806A,KP512302,KP1601XA,KP1191,KP10781L,KP1072,KP13251,KP1193,KP1192,KP201,KP1078BL,KP13252,KP13255,KP13134,KP10780,KP13254,KP18026,KP10781,KP1078BH,KP13135,KP512308,KP30262,KP30264,KP28134A,KP30261,KP1184,KP22315A,KP23265C,KP1078A,KP1078B,KP4214,KP21824M,KP4213,KP21824L,KP23267,KP21825C,KP1074L,KP10750,KP1810X,KP10751,KP10752,KP1074Q,KP1075A,KP1075B,KP1075C,KP522201A,KP22066,KP22064,KP18001,KP3501A,KP22062,KP10760,KP10761,KP10762,KP1075Q,KP1326,KP28163,KP1325,KP28162,KP523208A,KP1075X,KP1274FQH,KP1274FQC,KP1273FC,KP1076A,KP12682F,KP1076B,KP107BQ,KP1274FC,KP22035,KP2801A,KP2813A,KP1274FH,KP18330,KP1505X,KP1274FN,KP12353,KP1274FQ,KP1072L,KP12354,KP1313,KP119,KP1072Q,KP1315,KP116,KP35101,KP118,KP22306A,KP107CQ,KP23132,KP23131,KP23130,KP123,KP18106,KP122,KP1073L,KP18108,KP1073Q,KP23223,KP23223M,KP1271FN,KP14633,KP14634,KP14631,KP1070L,KP14632,KP2201B,KP18002F,KP1070Q,KP1601A,KP1462X,KP12760F,KP521405,KP1273FQC,KP521403,KP107AL,KP3310,KP22308A,KP1255,KP522302E,KP15051,KP107AQ,KP14622H,KP15052,KP18320,KP1071L,KP1505A,KP1463X,KP123X,KP1071Q,KP81103,KP28123,KP28122,KP18001M,KP1271FC,KP1272FH,KP522208A,KP127XFQH,KP12551,KP1272FN,KP12554,KP127XFQC,KP2205,KP2206,KP2203,KP2322,KP2201,KP2202,KP1234,KP28162X,KP14622,KP14623,KP14501,KP1272FQH,KP1469,KP1255X,KP1272FQC,KP1272FC,KP1463,KP1221,KP1462,KP1220,KP52140X,KP1222,KP1806X,KP1182,KP1462XH,KP1511X,KP2822,KP12684FM,KP1059A,KP3111,KP1272FNQ,KP421,KP127XFQ,KP1162,KP1164,KP10780H,KP18053,KP1274F,KP18058,KP18055,KP2806,KP18059,KP127F,KP18001B,KP18001A,KP1271FQC,KP35064,KP35062,KP18061,KP18062,KP18069,KP1805X,KP18068,KP522308E,KP14624H,KP15113,KP15114,KP15111,KP3506X,KP1402A,KP12761F,KP2591,KP127FQ

2023/6/1 - 必易微 - 选型指南 - REV 1.1 代理服务技术支持现货查询批量订货查看更多版本

必易微（KIWI）LED驱动IC选型指南

目录- 非隔离、隔离产品智能调光、可控硅调光和其他产品非隔离恒压、隔离恒压和DC-DC产品 LED照明产品特点和应用介绍

型号- KP18032,KP18108A,KP14663C,KP10790,KP10791,KP10792,KP1325X,KP1079A,KP1264FC,KP1261F,KP2182,KP13152,KP14662C,KP13154,KP1264FM,KP1164M,KP1276XF,KP1079X,KP1402,KP106,KP107W,KP119X,KP107L,KP23132M,KP107Q,KP1511,KP421X,KP523201A,KP35026,KP1194,KP2816X,KP1191,KP106N,KP1193,KP1192,KP201,KP13252,KP13255,KP13134,KP13254,KP18026,KP107XQ,KP13135,KP1063,KP1062,KP22315A,KP23265C,KP1199A,KP1199B,KP4214,KP1054A,KP4213,KP23267,KP1062C,KP21825C,KP1074L,KP10750,KP1062N,KP1810X,KP10751,KP10752,KP1261FC,KP1075A,KP522201A,KP1063C,KP22066,KP22064,KP3501A,KP10760,KP1063N,KP10761,KP10762,KP1326,KP28163,KP1325,KP28162,KP523208A,KP1075X,KP1273FC,KP1076A,KP12682F,KP1274FC,KP22035,KP1274FH,KP14651,KP1505X,KP1274FN,KP14652,KP12353,KP1072L,KP12354,KP14653,KP14654,KP1313,KP1072Q,KP1315,KP116,KP35101,KP22306A,KP1262FC,KP14664M,KP1263FC,KP1061C,KP23132,KP23131,KP23130,KP123,KP14662,KP18106,KP122,KP1073L,KP18108,KP1061N,KP1073Q,KP23223,KP23223M,KP126XFC,KP16015,KP1271FN,KP1070L,KP14632,KP2201B,KP1070Q,KP12760F,KP521405,KP521403,KP107AL,KP3310,KP22308A,KP1255,KP15051,KP107AQ,KP15052,KP1071L,KP1601X,KP1505A,KP123X,KP1071Q,KP28123,KP28122,KP1271FC,KP1272FH,KP522208A,KP12551,KP1272FN,KP14612,KP12554,KP2205,KP2206,KP2203,KP122X,KP2322,KP2201,KP2202,KP1234,KP28162X,KP14622,KP14501,KP1466,KP1255X,KP23225C,KP1272FC,KP1221,KP1220,KP1222,KP1264F,KP1806X,KP1061,KP1511X,KP12684FM,KP1059A,KP3111,KP127XF,KP116X,KP127XFC,KP421,KP2816,KP127XFN,KP1601,KP2813,KP1162,KP1164,KP2012,KP2013,KP18053,KP1274F,KP18058,KP1262F,KP18055,KP18059,KP127F,KP2801,KP35064,KP12762F,KP35062,KP18061,KP18062,KP18069,KP1805X,KP18068,KP15113,KP15114,KP15111,KP3506X,KP12761F

2022-07 - 必易微 - 选型指南 - REV 1.2 代理服务技术支持现货查询批量订货

Nisshinbo（日清纺）电子芯片选型指南（中文）

目录- 公司简介新产品列表运算放大器和比较器 AFE 电源管理IC LED驱动器/控制器音频和视频IC 通信用IC和射频器件电机IC 光电传感器信号调节外设产品封装一览产品索引

型号- NJM2902C,NJM2902B,NJU7076B,NJM7056,R3134,R3133,R2045,NJW2368,R1191,R5550,NJW4303,R1190,NJM2842,R3132,NJM2841,R2043,R3130,NJM2846,NJM2845,NJM2847,NJL5901AR-1,NJM5532C,NJM2901C,R5110XXX1A,R5110XXX1B,NJM393C,R5326,NJG1697EM1,R5324,R3150-A,NJU6364系列,R5560,NJU6397系列,NJW2377,NJU1206MER,NJM2855,R2051,NJM2857,NJM2856,NJW1280,NJU7098A,NJM2902CA,R5110XXX2C,R5110XXX2D,NJM390A,NJU211,R3150-B,R2061,R3150-E,NJW2344,NJM2820,R3154,R3150-F,NJM2822,R2062,R3152,NJM2821,NJW4760,RM516,NJM2823,NJM2825,NJM2828,NJG1801AKGC-A,NJM2827,NJM2829,NSNJ9200A,NJM064C,NJM391A,RS5C338A,R5106,NJU3610,R5107,R5108,R5109,R5104,R5105,NJM2151A,R3160,R5101,NJM2831,NL6010,NJM2830,NA2100,NJM2835,NL6011,NJM2837,NJM2836,NL6012,NJM2839,NJL5902R,R1155,NJG1669MD7,R1154,NJW4107,NJU72501,NJW4106,NJW4105,NJM2570A,NJW4104,NJW4100,R1150,NJM2801,NJM2804,NJM2806,NJM2805,R5528,NJM062C,R5524,R5527,R5520,NJW4109,NJG1684ME2,NJW4108,R5523,NJW4118,NJW4116,NJW4113,R1163,R1160,R1161,NJW4111,NJW4110,NJW4351,NJM2815,NJM2816,NJM12877,NJW4162A,NJU7381A,NJG1108HA8,NJM2904CA,R3114,R2025,NJM2819A,R3112,NJG1617K11,R3111,R5538,R2023,R3118,R3117,NJM2904C,R5533,R3116,NJM2904B,NJG1144KA1,R1170,R3200X064A,NJMOP177,R1173,NJM2374A,R2262,NJW1298,NJW4321,R1171,NJW4320,R1172,NJM78M00S,NJM2903C,NJU7382A,NJM084C,RN5T618,R2033,NJG1801BKGC-A,R5542,R5543,R1180,R5540,R5541,NJM2373A,NJG1657MD7,NJW2392,NJM12856,NJU7365,NJU7366,NJU7367,NJU7092A,NJM2879-H,NJU7364,NJM2748A,RP600,MUSES8832,RN5U700,RP602,RP604,RN5T614,RP605,NB7200,NJU7360,R1801,NJU7356,NJU77572,R1800,NJM41001T,RN5RZ,NJU8759A,NJU7093A,NJU6368系列,NJU7116,NJL6402R-2,NJU7118,NJU7119,NJM2505A,NJU6322系列,NJW1200,NJG1740MHH,MUSES8820,RN5VD,NJU7387,NJU72090,R1810,NJU7141,R3200X002X,NJU7384,NJU7385,NJU7386,RC5T519,NJU72097,NJU6311系列,RM590,NJU7380,NJG1730MD7,NJU9555,NJM17431,NJM2769B,NJU77550,NJU7091A,R3200X001X,NJU77552,NJU77551,NJU77554,NJU6377系列,NT1189GDAE3S,NJU9103,RC5T619X,NJU9102,NJU9101,R5117,R5114,NJM2880,R5115,R5116,NJM2882,NJM2881,R5110,NJM2884,R5111,R3121XXXXG,NJM2883,NJM2641,R5112,NJM2886,NJW1230,NJM2885,R5590,NJM2888,NJM2646,NJM2887,NL6002,R3121XXXXA,NT1191GEAE3S,NJM2407,R3121XXXXE,NJM8191,NJM8190,NJU6063,NJU7394,RM517,RV5C348B,NJU6366系列,NJG1812ME4,NJM2893,NJM2173A,NJM2892,NJM2894,NJW1241,NJW1240,NJG1812AMET-A,NJU7392,NJU6062,NJU6061,NJU6222系列,NJU77580,NJU77582,RN5RF,NJU6402B,NJM2860,NJM2862,NJM2861,NJL5909RL-4,RN5RL,NJM2864,NJM2863,RN5RK,NJM2866,NJG1682MD7,NJM2865,NJM2868,NJU7181,NJM2626,NJM2867,NJM2627,NJL5830R,RN5RT,NJL6195R,NJW2307,NJM2749A,NJM2871,NJM2870,NJG1159PHH,NJW2311,NJM2872,R3121-A,NJM2875,NJM2874,NJM2877,NJM2876,R3121-E,NJU6080,NJM2879,NJM2878,R3121-G,NJG1816K75,NJG1143UA2,NJU7640,NJM14570,NJU6311,NC2700M,NJM2288,NJM2287,RP200,NJL5513R,RS5C372A,RP201,RS5C372B,RP202,NJW1143A,NJU7630,NJU7631,NJU7632,NJM2872A,NC2701M,NJU71074,NJM8830,NSVS1231,NJM2299,NJM2059,NJM2058,NJM2872B,NJG1145UA2,NJG1814MD7,NJU8759,NJU71041,NJG1146KG1,NJMOP1772,NJU8758,NJW1142A,NJU71044,NJW4305A,NJM5532,NJM084CA,NJM8801,NJM2871A,NJL6193R-3,NJM2871B,R3120XXXXE,NJU6323,NJU6322,NJU6321,R3120XXXXA,NJU7650,NJG1186PJL-A,NJU6324,NJW1933,NJM2275,NJM2274,NJM2278,NJM1431A,NJL6407R,NJM3414A,NJL6502R-1,NJM14558,NJU7200,NJU7201,NJU7202,NJM2768B,NJU7680,RP402,NJG1151MD7,NC2600,RP400,RP401,NJU7098AF1-C,MUSES72323,NJU3719A,NS1101,NJU7670,NS1102,NJU6324系列,NJU7677,NJM78M00,NJM41005T,NJG1818K75,NJM358C,NJL5510R,NJU7222,NJU7223,NJG1648HB6,NJL6401R-3,NC2702M,NJU6377,NJU6376,NJU7221,NJL5313R,NJM082CA,NJU7211,NJU6363,NJU6360,NJU7691,NJU6367,NC2703M,NJU6366,NJU6365,NJU6364,NJU6369,NJU6368,NJU8789,NJM358CA,NJU77903-Z2,NJU7690,NJU077,R1232,NJM2586A,RN5C752,NJD3015,RN5C750,NJM064CA,NSVS1093,NJW4148,R5111XXX1A,R5111XXX1B,NJW4142,NJW4141,NJW4382,NJW4140,NJW4750T1,NJM45001,NJW4381,R1243,R5601,R5602,R1242,NJU72322,R1245,NJG1186PJL,R5111XXX2D,NJU72315,NJW4615A,NJU72750A,NJM2561B,NJG1800NB2,R1240,NJM2561A,R5111XXX2C,NJW4155,NJW4154,NJW4153,NJM13403,NJM13404,NJU7388B,NJG1739K51,R5617,R5619,R5612,R5613,NJM393CA,R5610,R5611,NJW4119,NJW4128,NJU72751A,NJW4810A,NJM2584A,NJW4122,NJW5211,NJW5210,NJW4120,MUSES72320,NJG1173UX2,NSTS9116A,NJW4152-AB,NJD3004,NJU71091T1,NJD3007,NJG1801K75,NJW4138,NJM2583A,NJW4375,R1260,NJW4133,NJW4132,NJL6195R-W,NJW4372,NSTS9117A,NJU7386A,ND1160,NJU7606,NJM2566A,NJU7600,RN5C713,NJU7601,NJU7602,RN5C711,NJW1871A,RN5C716,NJM062CA,NJW4188,NJW4187,NJU7367A,NJW4186,NJU4051B,NJW4185,NP8700,NJW4184,NJW4183,NJW4182,NJW4181,NJU7367B,R1207,NJW4190,R1208,R1205,R1206,R1200,NJU71031,NJG1127HB6,NJG1156PCD,NJMOP2277,R1203,R1204,NJU71032,R1202,NJU77806,NJG1666MD7,NJW4196,NJW4191,R1218,NJU7620,NJU4053B,NJM2060,R1210,R1211,R1214,R1215,R1212,R1213,NJM2068,NJU3711A,NJM339C,NJW4161,ND1130,NJW4160,NJG1686MHH,NR1700,NJU7610,R1225,NJU72344,NJU72343,NJU6394系列,R1223,NJU72342,R1224,NJU72341,R3150XXXXE,R3150XXXXF,NJW4177,NJU4052B,NJG1117HA8,NJW4175,NJW4172,NJW4171,NJW4170,NJU3712A,R3150XXXXA,R3150XXXXB,NJM41031,NJU7870-Z2,NJM41033,NJM8020,NJU7086,NJM2903CA,NJM41035,R5114XXX2,R5114XXX1,NJU7391A,NJU7089,R5436,R5437,R5438,NJM8021,R5439,R5432,R5433,R5434,R5435,NJG1187KG1,NJW1159,NJM2723,NJM2725

2023/4/27 - NISSHINBO - 选型指南代理服务技术支持现货查询批量订货