小金体育注册平台

2.1 dingyamokuaideshurudianyayouyige20mv,50khzdewenbo。shifouhuiganraomokuaigongzuo?

原因:该纹波是供电电源的输出纹波。
解答:shijiyingyongzhong,liangjidianyuanzhijianbixuyaoyouyidingdelvbodianlu,kecanzhaowosijishushouce。xianquerengongdiandianyuandegongzuopinlv,mingqueganraoyuanshiqianjidianyuanhaishihoujidianyuanmokuai。

shiyongdingyachanpinjijidianqigongdian,weihefaxianzaoshenghuibijiaoda?

原因:继电器工作时对前级的反射纹波会比较大。
解答:建议做一些滤波措施,也可以在输入与输出的地之间加Y电容。

ceshimokuaishurushuchuzaoshengbijiaoda,shenmeyuanyin?

原因:检查纹波噪声的测试方法(平行线测试法或靠测法),示波器带宽设置为20MHz,输入端的纹波噪声大可能是模块输入端引入的干扰信号。
解答:建议在模块输入端加入共模电感滤除干扰信号,按照平行线测试法或者靠测法测试模块实际的纹波噪声,如果有更小的纹波噪声要求,则建议输出加π型滤波电路,或在输入与输出端加Y电容抑制共模噪声。

k7805t-500chanpinlangyongwentidezixun

解答:kehuzhengjixuyaoguolangyongsiji,youyuk78tchanpinneibuwulangyongbaohudianlu,xuyaozaidianyuanqianduantianyamindianzu、tvsguandenglangyongyizhiqijianhuodianlu,jianglangyongdianyajiangzhishurudianyafanwei。

weihedianyuanmokuaijimoshuzhuanhuanxitonggongdianshiwenbozaoshengda?

原因:模拟地和数字地没有分开,因此纹波噪声比较大。
解答:建议采用单点接地法。

weishenmeduijiangjikaojinzhengchangshiyongzhongdexitongshi,chuxianxitongdiaodian?

原因:对讲机的辐射信号会对产品工作产生影响,导致产品输出掉电。
解答:建议客户模块前端加滤波吸收电路,同时产品上加屏蔽措施(参考1.3问),加强抗干扰能力。

shiyongzhengfu9vshuangshuchuchanpindeshuchuchuanlianshiyonghuodezhengfu18v,shifoukexing?

解答:kexing,zheiyijingshiwosidechengshufangan。chuanlianshiyong,jiafanpianerjiguanhelvbodianrongjike(cankaoyingyongbiji),danshiwenbohuibianda,jingduxiajiang,jianyizaishuchuduanjialclvbodianluchuli。

mokuaidezuixiaoqidongdianliuyushurudianliushiduoshao?

解答:mokuaideqidongdianliuyibanzai1.4~1.6beiiin-maxzuoyou,jianyixuanzegonglvshaodadeqianjidianyuan;zuixiaodeshurudianliushizaikongzaideqingkuangxia,cankaoduiyingmokuaidejishushoucezhongzhibiao“kongzaidianliu”。

qidongshimokuaisunhuai,shenmeyuanyin?

原因:(1)模块负载有很大容抗,启动时需要很大的启动电流,大电流冲击损坏模块。
         (2)输出端反灌干扰输入控制系统。
解答:(1)建议降低输出容抗负载,按照技术手册上的推荐电容。
         (2)建议输出端接二极管防止反灌或者输出端接电感滤波电路降低反灌影响。

shenmeqingkuangxiaxuanyongk78?k78yuxianxingwenyaqixiangbiyoushizainali?

解答:zaishuchudianliuxiangduijiaodaqieshurushuchuyachajiaoda,duixiaolvyaoqiujiaogaobuxuyaogelidechanghekexuanyongk78xiliedechanpin;k78xilieyuxianxingwenyaqixiangbi:tijixiao,xiaolvgao,buxuyaowaijiasanrepian,kongzaigonghaoxiao,shurudianyafanweibijiaokuan,wenbozaoshengjidi,k78xxtxilieshuchudianyashikediaode。

CS引脚怎样使用?

解答:shuchucsyinjiaozhishiqiyigelvbodezuoyong,ruguoshijiyingyongduiwenboyaoqiubugaodechanghekeyibujie,danshijieshangquduishuchudewenbozaoshengyouyidingdeyizhixiaoguo。

ctrlkongzhijiaogongzuoshi,mokuaitingzhishuchu,dancishimokuaideshurudianliuda,huidaozhishenmehouguo?

解答:dangtongguoctrlkongzhijiaoguanduanmokuaishi,youyuneibuqijianhaicunzaiyidingdegonghao,suoyihuiyouyihenxiaodeshurudianliu,dangaidianliuzhiyibanzhiyou2mazuoyou,buhuiduimokuaizaochengshenmeyingxiang。ruguocunzaishurudianliuhendadeqingkuang,kenengshimokuaihaimeiwanquanguanduan,cishijianyizengjialiuguokongzhijiaodedianliuyidadaowanquanguanduanmokuaishuchu。

rongxingfuzaihendashimokuaiqidongbuliang,zenyanggaishan?

原因:实际应用时,容性负载超过模块正常使用时的最大容性负载,输出电容过大,开机瞬间需要很大的启动电流,会引起模块的启动不良。
解答:建议减小输出端所接电容或是在输出端加缓冲电路以提高模块带容性负载的能力。

dingyamokuaishuruduandefanshewenbohuiyingxiangqianjixitonggongzuome?

原因:开关电源模块内部工作时会向前级反射一个纹波信号,有可能影响前级电源。
解答:kaiguandianyuanshuruduandefanshewenboshibibukeshaode,jishishizhiliudianyuanyehuiyouwenbo,womenjianyizaimokuaiqianduanjiayigebijiaodadegongmodiangangouchengπxinglvboqi。

wrxiliechanpinctrlwaiweidianluzhongdegaodianpingfanweihedianzudequzhishizenyangde?

解答:CTRL管脚上接高电平关断输出,只要流入该引脚的电流在5-10mA,高电平的范围可根据电阻R的阻值和功耗设定。
注意:我司一代产品R的计算不需要减300欧姆。

mokuaiyifushuchudexingshizaikaiguanjipinlvbijiaodashihuichuxianqidongbuliangxianxiang,zenyangjiejue?

解答:jianyizaimokuaideshuchuduantianjiayidingdejiafuzai,yitigaozhengjiqudongnengli;lingwaikezaishurushuchuduanjiashangjishushouceshangtuijiandedianrongzhi,quebaozaikaiguanjishihuanmanqidong。

mokuaiqianduangongdiandianyuanweibenandianyuan,mokuaiqidongbuliang,zenmeban?

原因:本安电源最大启动电流限制,不足以提供满足模块的启动功率要求(模块在启动时需要较大的启动功率)。
解答:选择我司启动电流小的产品或者在模块输入端串小电阻或者电感降低模块的启动电流。

waijiedianrongdeesrzenmexuanqu?xuanquduodazhibuyingxiangchanpindewendingxing?

解答:jianyizai30mω-100mωfanweiyineijiukeyile,taidalehuiyingxiangshuchuwenbo。

dingyachanpinyouduanlubaohugongnengme?

解答:定压一代产品某些产品具有持续短路保护、自恢复功能,如IF-RN/T,BLS-1WR等,二代产品则全面提高性能,具有短路保护,具体参考技术手册。

dingyachanpinzaican、485tongxindengyingyongliduixitongzaochengganraozenmeban?

原因:排除了产品不良和客户使用方法不当等可能原因后,出现干扰现象的最大概率可能是产品的工作频率与系统芯片的工作频率出现频带重合。
解答:这种情况建议错开频带使用。由销售人员帮助重新选型,使用井森电路产品(普通电压产品频率在45KHz-180KHz,井森电路产品频率在200KHz-400KHz,型号的后缀是“JS”)。

kuanyachanpinshuruduantvsguanheshuchudianrongzenyangxuanqu?

解答:tvsguankeyigenjushurudianyalaiqueding,yibanquzhiweishurudianyade1.2~1.5bei,gonglvgenjufanghudelangyongdianyalaixuanze,shuchudianrongyibananzhaojishushoucewaijiedianrongtuijianzhixuanqu。

on/offyinjiaozenyangshiyong?

解答:k78xxt-500xilieon/offzhuyaoshixiankaiguankongzhidegongneng,zaion/offyinjiaojie“gnd”huoshizhurudidianping0~0.4vshi,mokuaiguanduan,on/offyinjiaoxuankonghuoshizhurudedianping1.2~6vshi,mokuaizhengchangshuchu。

dingyamokuaiyoumeiyoutongyongjiangdiwenbofangan?

原因:通用方案应用简单,在成本和操作上稍复杂。
解答:产品后级接LDO(7805、7905;78012、7912等)。

mokuaikaijiwushuchushishenmeyuanyin?

原因:前级输入电源功率不满足模块启动要求(模块的输入电压或电流过低)或者输出容性负载过大时模块不能正常启动产品无输出。
解答:(1)采用更大功率的前级电源,保证满足模块正常的启动电压、电流要求;
         (2)降低输出容性负载或者在输入端加软启动电路。

mokuaizaizhengchangqingkuangxiashiyong,shurudianyajiangdaozuixiaoshurudianyayixia,shuchuyichang,zenmejiejue?

原因:当实际输入电压低于模块最小额定输入电压要求时,会存在模块不能完全启动或者启动电流过大导致模块损坏。
解答:baozhengshurudianyazaiedingyaoqiufanweizhineihuozaishuruduanjiaqianyabaohudianlu。

guanyufeigelichanpinderechabawentizixun

解答:rechabashunjianhuichanshengyigejianfengdianya,duimokuaibenshenyouyidingdechongjizuoyong,rechababuhuizhijiedaozhichanpindeshixiao,danzhangqirechabahuisunshangmokuaibenshen,yinciwosimokuaidianyuandoujinzhirechaba。ruguoxuyao,zaimokuaiqianduanjiayixierechabakongzhidianlucainengshichanpinzhengchanggongzuo。

k7805t-500zenyangtongguor1her2diaojiededao6vshuchudianya?shifouhuiduimokuaiyouyingxiang?


解答:keanzhaoyixiabiaogejisuanfenyadianzuzhi。


    Vo代表实际想得到的输出电压值。
dianzur1、r2duizaoshenghexiaolvxingnengjibenmeiyouyingxiang。

weishenmemokuaiyingyongzaifuzaijiaoqingshiyouzhendangxianxiang?

原因:模块输出的负载在小于10%(R2代小于5%)时应用,模块的环路不稳定,容易出现振荡,输出电压也可能不稳定。
解答:不建议在此种情况下应用,建议增加负载(加假负载)或是在功率满足的前提下选用功率低一点的模块。

kehushiyongdingyamokuaijiyunfanggongdian,zuocaijishiyong,tongshidanxinchanpinwenbozaoshengpianda?

原因:开关电源是靠电感、电容进行储存能量的,输出必然会产生一定的纹波和噪声。
解答:担心纹波噪声偏大的话可以加适当的滤波措施就可以解决了,具体可以参考技术手册推荐电路和参数,或采用我司井森电路产品(40mV左右)加滤波。如需极低纹波噪声可采用高精度低纹波输出的LDO(uV级)。

dingyachanpindeshurudiyushuchudikeyiduanjiezaiyiqime?

解答:keyi,danbixuzaichanpinqianhoujijiashangtuijiandianrong。bingqiezaiduanjiehougaichanpinbuzaijuyougeligongneng。

k78xxfushuchushiyongshiqidongdianliuda,shenmeyuanyin?

原因:一代产品用于负输出性能时,电路结构由BUCK转化为BUCK-BOOST,但电路参数性能不能兼容,导致负输出功能有一定欠缺。
解答:一代产品不建议做负输出使用,推荐使用R2产品,该系列产品内部电路已做修正,正负输出性能可同时满足,启动电流为1.1-1.2倍的Iin(max)。

duiyushuanglushuchudechanpin,kehushiyongshidaizaibupinghengshiwenbochuxianmaocizenmechuli?

原因:负载不平衡,输出的纹波噪声和电压的精度会变差。定压双输出产品带载两路负载的平衡度要求在5%以内。
解答:cimaocishuyuzaoshengganrao,kehushiyongfilter2houjiejueciwenti。

langyongceshideshihouqianduandetvsguansunhuai,zenyangjiejue?

解答:langyongdianya、dianliuchaoguotvsguanedingguigeyaoqiu,daozhisunhai,huoshiqianduanlangyongceshidechixushijianbijiaozhang,jianyixuanzegonglvgengdadetvsguanhuozaimokuaiqianduanjiawenyadianluhuozheguoyabaohudianlu。

dangshurudianyadiyumokuaizuidiqidongdianyaqidongshihuicunzaishenmewenti,zenyangbimian?

原因:低于模块的输入电压范围启动可能会损坏模块,主要是因为宽压模块输入没有欠压保护电路,启动电压是由MOS管的门限电压与软启动电路来决定的,通常MOS管的开启电压比模块最低输入电压低2V以上。

解答:(1)保证实际输入电压在技术手册规定额额定范围之内。
         (2)建议按照《DC/DC应用笔记》在模块前端加入输入欠压保护电路。

k78xiliezaiyingyongshijihouduandemokuaidianyuangongdianchuxianqidongbuliangxianxiang,shishenmeyuanyin?

解答:k78xiliechanpingonglvjiaoxiao,qiedianyuanmokuaiqidongshishunshigonglvzengda,k78mokuaibuzuyitigongzugoudegonglvgonghouduandianyuanmokuaiqidong,jianyixuanzegonglvgengdadechanpin。

ctrlyinjiaodewaiweishizenyangshiyongde

解答:xuankonghuogaozushi,mokuaizhengchangshuchu;jiegaodianping(xiangduiyushurudi),mokuaiguanduan;liurugaiyinjiaodedianliuyibanzai5~10maweiyi,gaodianpingdefanweikegenjudianzurdezuzhihegonghaosheding。

dc-dcdingyachanpinkeyiyingyongzaiqiangcichanghuanjingzhongme?

原因:定压产品是采用磁场方向交替转换的原理实现的。如果没有屏蔽措施,强磁场使得产品工作在类似于短路的情况下,产品易损坏。
解答:建议用锡箔纸包裹该定压产品,实现屏蔽。

mokuaideshurushuchu“di”shifoukeyiduanjiezuoweifeigelishiyong?

解答:zaishijiyingyongduiemchewenbozaoshengyaoqiubugaodechanghehuoshiduimokuaimeiyougelidianyayaoqiudeqingkuangxia,shurushuchu“di”keyigongjie。

mokuaideshurudianyajianlibijiaohuanman,shuchudianyabuwending,zenmejiejue?

原因:当模块前端与其他电路共享电源供电时,供电电源的一些影响导致输入电压跌落,引起模块输出不稳定。
解答:在模块的输入端可以加一个欠压保护电路,避免模块在低于最小启动电压异常工作。

k7805t-500dekaiguanpinlvyuneibushifouyoufanghudiangan?

解答:kaiguanpinlvyouneibuqijianjueding,wei1.4mhz,chanpinneibuyouyigegonglvlvboqidiangan,zhishiqidaochunenghelvbodezuoyong,bingmeiyoufanghuzuoyong。

shenmeyuanyindaozhimokuaikaijibaohu?

原因:模块所带负载存在瞬间跳变且超过模块过载要求,导致开机模块保护。
解答:选用功率大、满足负载要求的模块,模块输出部分加缓冲电路以降低瞬间负载电流。

mokuaizaishiyongguochengzhongchuxianganrao,shujucaijixinhaofashengtiaodongdexianxiang,zenyangjiejue?

解答:shujucaijixinhaoduishuchuwenbozaoshengdeyaoqiubijiaoda,jinliangxuanyongyouydianronggelidemokuai,huoshizaiyingyongmokuaishijinliangzaishuruduanjiagongmodianganyizhigaopinganrao,shuchujialclvbodianluyizhihouduandianluxinhaoganrao。

shiyongdingyachanpinduikehucaijixinhaoyouganraozenmeban?

原因:客户使用的芯片对输入信号品质要求较高,电源模块输出信号会有一定的纹波噪声,以致芯片误操作。
解答:在敏感芯片前加一些滤波措施,可以选择电感、电容等,可参考技术手册。

dingyachanpindeduanlubaohusuozuidayunxudianliushiduoshao?

解答:dingyachanpinmeiyouqueqiediguozaibaohudianliudian,kehuxiangzhidaodeshiguozaibaohudedianliudian,wosiwufatigongguoliudianyebuchengnuochanpinyouguozaigongneng。

mokuaizenyangshixianfushuru?

解答:zaifudianya-48vshurushi,shurudianyade“0v”jiemokuaideshuru“vin”,“-48v”jieshuru“gnd”,baozhengshuruduandedianshicha,fushurudeshihouxuyaomokuaideshurudianliuyuzhengshuruliuxiangyizhi,zuihaozaishuruduanchuanlianyigeerjiguanfangzhifanjie。

k7805-500r2dangzuofudianyashuchushiyongyingzhuyishenmewenti?

解答:fushuchushiyongdeshihouzhuyichanpindezuigaoshurudianyajiaozhengshuchudexiao;lingwaimokuaidangfushuchuyongshidegonglvjiaozhengshuchudeedinggonglvxiao,qieyidaichanpinbunengzuofushuchushiyong。

dc-dcdingyachanpinguobuleemczenmeban?

原因:定压产品的静电能力可以达到接触放电6-8KV,但由于定压产品是二次电源,它的体积受到限制,没有针对EMC其他项目设计专门的防护电路。
解答:如客户的应用环境对EMC方面有较高要求,请参考技术手册上的推荐电路在产品外围搭建相关的电路。

zenyangshiyongdanlushuchuchanpinchanshengyigefushuchudianya?

解答:dingyachanpinshikaihuande,shuchudezhengfuzhishixiangduizhi,youjiexianfangfajuedingyaoshixianfudianyashuchuyou2zhongchangyongxingshi:


a.shuchuduanbiaodevo、0vshichanpinbenshendeshuchuzheng、shuchudi;yaodedaofushuchu,zhiyaoanyuanquanneidebiaozhu“yuanlaishuchuzhenggaiweishuchudi,shuchudigaiweifushuchujike”

b.jiangshurudi、shuchuzhenglianjiededaoyigegongdi,yuanlaideshuchudijiuchenglefushuchu。xuzhuyicishichanpinbuzaigeliqiezaoshengbianda,shurushuchubixujiadianrong(rongzhicanzhaojishushouce)。

chanpinbinglianshiyongyouwentime?

解答:chanpinshuchuduanzhiyouzairongyushejideqingkuangxiakeyibinglian,bunengyongbingliandefangshihuodegengdadegonglvshuchu。shuruduankeyibinglianshiyong,danxuzaizuikaojinchanpinshuruduandedifangjieru10ufdianrong(10uhdiangan);zongshuruduanjiadalvbodianrong、huoπxinglvbo、huo100uhdiangan。

zaimokuaishuru、shuchuduanjietandianrongshifouyouyingxiang?

解答:tandianrongbijiaorongyijichuanerchengduanlutexing,kanglangyongnenglicha,henkenengyouyuyigedadeshunjiandianliudaozhidianrongshaohuierxingchengduanlu,huoshikaijishunjianchanshengyigehengaodelangyongdianya,zaochengtandianrongguoyajichuan,mokuaizaiyingyongshi,shuruduanzuihaobuyaojietandianrong。jianyishurulvbodianluyongtaocidianronghuoshidianjiedianrong。mokuaideshuchudianyahenwending,zaishuchuduanjietandianrongbixuquebaonaiyazhiweishuchudianyade2beiyishang。 

ctrlwaiweiyingyongdianluzhongdeerjiguanzuoyongshishenme?

解答:cierjiguanzhuyaoshiqidaofangzhifanxiangdianliudedaoguanzuoyong,yidanqueshaoerjiguan,dianyafankuihuilujiuhuiyouxiaoxinhaodianliutongguokongzhijiaoliuchumokuai,huishidemokuaigongzuoyichang。

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