【经验】内置线性稳压器的电源无法启动的故障案例分享
LDO和三端稳压器等线性稳压器,因其设计简单且价格低廉而被广泛用于各种应用中,只要是电子电路的设计人员,应该都用过这类电源IC。然而,在某些使用方式、使用条件和负载条件下,可能会发生无法启动的问题。
案例:手工焊接导致IC和外围元器件受损
ROHM线性稳压器IC和外围元器件通过焊接安装在PCB(印刷电路板)上。量产时是通过自动设备来管理焊接温度和时间的,因此通常不会出现问题。但是在试制或返工等情况下,会使用电烙铁进行手工焊接,这时可能会损坏IC和外围元器件,导致电源电路无法启动(不工作)。
IC的安装条件在产品官网的相关产品页面下“封装和质量数据”中的“安装规范”中会提供(例:ROHM官网链接)。对于可以使用电烙铁手工焊接的封装,提供了推荐焊接条件,需要按照这些条件进行焊接。条件示例如下。
TO252-3封装的电烙铁焊接推荐条件示例
●电烙铁温度:380℃以下
●焊接时间:4秒以下(每个引脚)
图 1
但是,如果超过该条件值,IC可能会因封装开裂或内部键合线脱落等问题而损坏。另外,如果是不建议使用电烙铁进行安装的封装,在试制时不得不使用电烙铁的情况下,损坏风险会增加,因此需要在短时间内进行精心焊接,当电路不能正常启动(工作)时,可以怀疑IC是否受损。
此外,不仅IC会因手工焊接而受损,电阻器和陶瓷电容器等构成外围电路的表面贴装元器件也有同样的可能性。每种元器件的技术规格书等资料中会提供手工焊接的推荐条件,应按照这些条件进行焊接。条件示例如下。
电阻器的手工焊接推荐条件示例
●电烙铁头的温度:350℃
●焊接时间:4s Max
●次数:1次
●功率:20W Max
* 0603(0201)、0602(01005)尺寸的产品除外
基本上,元器件的尺寸越小,用电烙铁焊接时越容易受损。特别是1005(0402)尺寸以下的元器件容易受到外部应力的影响,引脚电极可能会因过热或来自电烙铁头的外力而剥落,从而导致开路故障。尤其是重复使用同一产品时容易发生这种问题。引脚电极的剥落很难通过肉眼进行判别。如果通过分压电阻设置的输出电压没有正常工作,或者出现异常波形,可以怀疑是外围元器件受损。
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本文由三年不鸣转载自ROHM,原文标题为:内置线性稳压器的电源无法启动的故障案例,本站所有转载文章系出于传递更多信息之目的,且明确注明来源,不希望被转载的媒体或个人可与我们联系,我们将立即进行删除处理。
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【选型】ROHM(罗姆)线性稳压器选型指南(中文)
目录- 超小型CMOS LDO稳压器 高耐压LDO稳压器 次级LDO稳压器 高音质音响用电源 单通道输出线性稳压器 多路输出LDO DDR SDRAM用终端稳压器 LDO+(加) 封装一览表
型号- BUXXTD3W,BDXXIA5M-M,BD4269EFJ-C,BDXXHC5W,BD35395FJ-M,BUXXPB1WHFV,BUXXTA2WHFV,BAXXDD0WT,BD3650-M,BDXXHC5M-M,BD3506F,BD4XXM2-C,BD7602GUL,BDXXGA3W,BAXXBC0W,BAXXBC0T,BDXXIA5M-LB,BAXXCC0FP,BHXXPB1W,BUXXJA2D -C,BDXXIA5,BD4XXM5FP2-C,BA78XX,BAXXCC0WFP,BD3550HFN,BDXXIC0W,BD7XXL5-C,BDXXHXXWEFJ,BDXXHA3MEFJ-M,BD357XYFP-M,BDXXHA3W,BUXXJA2M-C,BDXXGA5MEFJ-M,BHXXSA3W,BDXXC0AFPS,BU6652NUX,BDXXIC0,BDXXHC0M-M,BA1117FP,BD4XXM5WFP2-C,BDXXGA5W,BDXXHC0M-C,BDXXHA3M-M,BDXXHA5,BDXXHA3,BD357XY-M,BUXXSA5WGWZ,BDXXHA3MEFJ-LB,BD00D0AWHFP,BHXXNB1,BD7XXL5FP-C,BD4XXM2EFJ-C,BA78XXFP,BAXXCC0T,BU6653NUX,BUXXSA4W,BDXXHA5M-LB,BAXXCC0W,BD357XYHFP-M,BDXXIC0WEFJ,BD4XXM2WFP3-C,BDXXFC0WEFJ,BD3507HFV,BUXXSD2M -M,BD42754,BUXXTA2WNVX,BDXXHC0W,BD80C0AFPS-C,BA78MXXCP,BA33D15HFP,BD3541NUV,BD35XXX,BDXXGC0MEFJ-LB,BDXXKA5WFP,BDXXGA3MEFJ-M,BD800M5WFP-C,BDXXGA3,BA178MXXFP,BUXXTA2W,BD7004NUX,BDXXHC0,BAXXDD0W,BUXXSA5W,BD8XXM5W-C,BDXXHC0MEFJ-LB,78MXX,BDXXGA5,BDXXHC5,BUXXJA2DG-C,BAXXBC0WCP-V5,BAXXBC0FP,BD7XXL5,BD7XXL2,BA00CC0WT-V5,BD3512MUV,BUXXTA2,BAXXDD0,BDXXFA1M-M,BUXXRB1WGUT,BD4271 -C,BDXXHA3WEFJ,BD4XXM2W-C,BDXXC0AW-C,BAXXBC0WT-V5,BU6654NUX,BDXXHC0WEFJ,BAXXCC0WT,BDXXC0AHFP-C,BD00FA1W,BDXXGA5M-LB,BDXXKA5W,BDXXFA1,BDXXGC0,BUXXSD2MG-M,BDXXFA1FP3,BDXXHC5WEFJ,BAXXCC0,BD4271FP2-C,BD4271HFP-C,BU33UV7NUX,BDXXIC0MEFJ-C,BDXXGC0WEFJ,BD4XXM5FP-C,BDXXHA5MEFJ-M,BDXXIC0MEFJ-M,BD357XY,BD37201NUX,BDXXGA3WEFJ,BDXXGA5M-M,BDXXIC0M-C,BDXXGA5MEFJ-LB,BA178MXXCP,BDXXFD0,BDXXGA3WNUX,BUXXSA4,BD3539NUX,BD8XXM5,BUXXSA5,BD3533F,BD4271HFP,BDXXIA5WEFJ,BHXXSA3,BDXXIC0M-M,BDXXGA3MEFJ-LB,BDXXC0AFP2-C,BAXXBC0WFP,BD3539FVM,BUXXSA3WGUT,BDXXC0AWFP,BDXXIA5W,BDXXC0A-C,BAXXJC5,BDXXFC0,BDXXHC0MEFJ-C,BAXXBC0,BA178XXCP,BDXXHC0MEFJ-M,BDXXHA5M-M,BDXXIXX,BDXXIC0MEFJ-LB,BUXXJAMNVX,BD3650FP-M,BDXXGC0M-M,BDXXKA5FP,BD7003NUX,BD4269FJ -C,BD3020HFP,BD4XXM5-C,BAXXBC0WT,BA1117,BUXXJA2,BDXXIA5MEFJ-LB,BDXXIC0WHFV,BD9B300MUV,BDXXFA1MG-M,BA178XX,BD4XXM2FP3-C,BD4269EFJ -C,BDXXD0A,BA78XXCP,BDXXFD0WHFP,BHXXRB1W,BUXXTD3,BD3552HFN,BDXXC0AFP-C,BD4271,BDXXHC5MEFJ-LB,BHXXRB1,BDXXHXX,BUXXNB1WHFV,BDXXGC0W,BUXXJA2V -C,BUXXTD2,BD4269,BDXXHC5MEFJ-M,BA178XXFP,BDXXC0AWFP-C,BD4269EFJ,BD3540NUV,BA78MXXFP,BD7XXL2FP3-C,BU6655NUX,BD7XXL2-C,BDXXFC0WFP,BD3508MUV,BDXXFC0FP,BD00D0AW,BD35390FJ,D4XXM5WFPJ-C,BD7XXL2EFJ-C,BDXXHA5W,BDXXFD0W,BDXXGC0MEFJ-M,BHXXNB1W,BD3551HFN,BDXXIC0M-LB,BAXXDD0WHFP,BD9B600MUV,BD3521FVM,BU6650NUX,BDXXC0A,BD3533HFN,BD3021HFP,BUXXJA2MNVX-C,BDXXKA5,BUXXSD5,BD7XXL2FP-C,BDXXC0AW,BDXXGXX,BDXXIA5MEFJ-M,BAXXJC5T,BD4XXM5W-C,BDXXHC5M-LB,BDXXHA5WEFJ,BUXXSD2,78XX,BA33D18HFP,BA178MXX,BA30E00WHFP,BD4XXM2WEFJ-C,BAXXJC5W,BDXXGA3M-M,BDXXFD0WFP2,BD4XXM5,BU6651NUX,BD4269FJ-C,BA78MXX,BA00JC5WT,BD4269FJ,BD4XXM2,BDXXFC0W,BUXXTD2WNVX,BD3533FVM,BD42754FP2-C,BUXXJA2VG-C,BD3504FVM,BUXXSA4WGWL,BDXXGC0M-LB,BD00FA1WEFJ,BDXXGA5WEFJ,BDXXGA3M-LB,BUXXJA2MNVX,BUXXSD5W,BD3509MUV,DXXIC0MEFJ-C,BA00DD0WCP-V5,BDXXIA5MHFV-M,BUXXSD5WG,BA00CC0WCP-V5,BD42754 -C,BUXXTD2W,BHXXPB1,BD00IA5MHFV-M,BD3650,BDXXHA3M-LB,BUXXTD3WG,BDXXHA5MEFJ-LB,BD42754FPJ-C,BDXXHC0M-LB
探索电阻奥秘!小电阻大奥秘—分流电阻器使用方法之实践篇
电阻器是ROHM的创业产品,ROHM在电阻器产品开发方面始终走在行业前列。电流检测用分流电阻器主要用于电机驱动电路、电源的过电流保护以及电池剩余电量检测,目前已被广泛应用于汽车、工业设备、消费电子设备等众多领域。要满足各种应用的节能要求,就需要使用高精度且高可靠性的分流电阻器进行精确的电路控制。
ROHM(罗姆)电阻器选型指南(中文)
描述- IT设备不可或缺的贴片式电阻器和贴片排阻器是由ROHM开发出的产品,属世界首创。 ROHM正在加强的一个品种,旨在各个领域的高附加值的产品,对应的紧凑和高性能的可靠性。另外,为了有效利用资源还提出了与降低成本有关的窄间距纸带卷绕电阻器。
型号- MCR006,MCR004,MCRL 系列,KTR,UCRC系列,SFR10,LTR100L,MCR004EQLCF□□□□,SFR03,SFR01,KTR系列,PMR18L,LTR 系列,UCRC,UCR18C,PMR25HZPJV□□□□,PSR400,PMR10L,SDR,MCR01,MCR004E,MCR03,MCR10S,LTR18,MCR50S,MCR10L,MCR18S,UCR10EVHFS□□□□,GMR,MCR50L,LTR10LEZPFL□□□□,PML系列,MCR18L,PMR03,PMR100,PSR350KTQFCW0L27,LTRL系列,PMR01,LTR10,PML50,GMR100HJAFD□□□□,ESR10EZPJ□□□□,KTR25,PMRL系列,PML100,UCR01,UCR03,MCR01S,SFR03EZPJ□□□□,MCR25S,SFR25,ESR25,SDR03,MCR03SEQPFL□□□□,MCR25L,PMR18,MCRS系列,SFR,PMR10,ESR,UCR18,UCR 系列,GMR 系列,MCRE,UCR10,ESR10,PMR 系列,PMR25,MCRS,MCRL,SFR18,LTR10L,ESR18,MNR系列,MCR,MCR006YLPFL□□□□,KTR03,UCRC 系列,UCR,MCRL系列,GMR320,MCR03S,LTR100,PSR400ITQF□□□□□,ESR03,MCR系列,ESR01,GMR100HJAAFD□□□□,SDR系列,PML50HZPJV□□□□,KTR10,KTR10EZPJ□□□□,PMR10LEZPJV□□□□,LTR系列,MNR02M0APJ□□□,PMR系列,PSR,SDR10,LTR50,GMR系列,KTR18,UCR10CEVPFS□□□□,PML 系列,PSR350,PML10,PSR 系列,MCR10,LTR,GMR50,MCR10LEQPJL□□□□,GMR100,MCRE系列,UCR006,MNR,MCR100S,PMRL,MNR12,MNR15,MNR14,MCR100L,PSR100,SFR系列,MNR18,PMR50,UCR系列,PSR500,PML18,MNR15E0RPJ□□□,LTRL,UCR10C,ESR系列,SMR003RXJ□□□□,PML,PMR100HZP7FV□□□□,MNR02,PMR,MNR04,PSR系列,PSR330,LTRL 系列,LTR18EZPJ□□□□,SMR003,MCR18
2A/1A Fixed Output LDO Regulators Datasheet
型号- BA07CC0WFP-E2,BAXXCC0T,BAJ2CC0T,BA033CC0T,BAXXDD0HFP,BA50DD0WHFP-TR,BA50DD0T,BA06CC0T,BAXXDD0WT,BA06CC0FP-E2,BA033CC0WFP-E2,BA08CC0FP-E2,BA08CC0T,BA05CC0WT,BAJ5CC0FP-E2,BAXXDD0WHFP,BAJ2CC0WT,BA07CC0T,BA25DD0WT,BA33DD0WT,BAJ2DD0WHFP-TR,BA18DD0T,BAXXDD0T,BA09CC0T,BAJ6DD0WT,BAJ0CC0T,BAXXCC0FP,BA09CC0WT,BA15DD0WHFP-TR,BAJ6DD0T,BA033CC0FP-E2,BA90DD0T,BAXXCC0WFP,BA05CC0WFP-E2,BA03CC0WT,BA25DD0T,BAJ0CC0WT,BAJ0CC0FP-E2,BA07CC0WT,BA05CC0FP-E2,BA25DD0WHFP-TR,BA30DD0WT,BAJ2DD0WT,BA07CC0FP-E2,BAJ2CC0FP-E2,BAJ2CC0WFP-E2,BA30DD0T,BA09CC0FP-E2,BAXXXX0XXXX-XX,BA09CC0WFP-E2,BA18DD0WHFP-TR,BA08CC0WT,BA06CC0WFP-E2,BAXXCC0WT,BA03CC0T,BA033CC0WT,BAJ2DD0T,BA30DD0WHFP-TR,BAJ6DD0WHFP-TR,BA18DD0WT,BA90DD0WT,BA15DD0T,BA08CC0WFP-E2,BA50DD0WT,BA90DD0WHFP-TR,BA33DD0WHFP-TR,BA15DD0WT,BA33DD0T,BA05CC0T,BAJ5CC0T,BA03CC0FP-E2
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可定制分流器电阻范围20uΩ~100uΩ,可自由设计铜排形状尺寸,电镀:镀锡/镀镍。支持RoHS指令 、AEC-Q200。认证资格:IATF16949;ISO9001;检测精度:0.1%。
最小起订量: 100个 提交需求>
可定制位移传感器量程范围10~600mm,该YWD型位移传感器表面有带刻度的透明窗☐,每毫米的变化量误差不超过3ue/mm,可在静态、准静态和低频动态下工作。主要指标:非线性<0.2%;供桥电压<10v;测试精度:0.01mm。
最小起订量: 1 提交需求>
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