開關電源PCB排版技能和關鍵點
開關電源PCB排版技能規矩
旁(pang)路瓷片電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)容(rong)(rong)(rong)(rong)(rong)器(qi)(qi)的(de)(de)(de)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)容(rong)(rong)(rong)(rong)(rong)量(liang)(liang)(liang)(liang)(liang)不(bu)(bu)能(neng)太大(da)，而它(ta)的(de)(de)(de)寄(ji)生串(chuan)(chuan)聯(lian)(lian)(lian)(lian)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)感(gan)量(liang)(liang)(liang)(liang)(liang)應(ying)該盡量(liang)(liang)(liang)(liang)(liang)減小。多(duo)個(ge)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)容(rong)(rong)(rong)(rong)(rong)器(qi)(qi)并(bing)(bing)聯(lian)(lian)(lian)(lian)能(neng)改進(jin)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)容(rong)(rong)(rong)(rong)(rong)的(de)(de)(de)高(gao)頻(pin)(pin)(pin)(pin)(pin)阻(zu)抗(kang)(kang)特性(xing)當(dang)一(yi)個(ge)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)容(rong)(rong)(rong)(rong)(rong)器(qi)(qi)作(zuo)(zuo)業(ye)頻(pin)(pin)(pin)(pin)(pin)率(lv)(lv)(lv)在(zai)fo以下時(shi)(shi)，電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)容(rong)(rong)(rong)(rong)(rong)阻(zu)抗(kang)(kang)Zc隨(sui)頻(pin)(pin)(pin)(pin)(pin)率(lv)(lv)(lv)的(de)(de)(de)上(shang)升而減小;當(dang)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)容(rong)(rong)(rong)(rong)(rong)器(qi)(qi)作(zuo)(zuo)業(ye)頻(pin)(pin)(pin)(pin)(pin)率(lv)(lv)(lv)在(zai)fo以上(shang)時(shi)(shi)，電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)容(rong)(rong)(rong)(rong)(rong)阻(zu)抗(kang)(kang)Zc會(hui)變得像電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)感(gan)阻(zu)抗(kang)(kang)一(yi)樣隨(sui)頻(pin)(pin)(pin)(pin)(pin)率(lv)(lv)(lv)的(de)(de)(de)上(shang)升而添加;當(dang)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)容(rong)(rong)(rong)(rong)(rong)器(qi)(qi)作(zuo)(zuo)業(ye)頻(pin)(pin)(pin)(pin)(pin)率(lv)(lv)(lv)挨(ai)近fo時(shi)(shi)，電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)容(rong)(rong)(rong)(rong)(rong)阻(zu)抗(kang)(kang)就等(deng)(deng)(deng)于(yu)(yu)它(ta)的(de)(de)(de)等(deng)(deng)(deng)效(xiao)串(chuan)(chuan)聯(lian)(lian)(lian)(lian)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)阻(zu)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)解(jie)(jie)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)容(rong)(rong)(rong)(rong)(rong)器(qi)(qi)一(yi)般都有(you)很大(da)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)容(rong)(rong)(rong)(rong)(rong)量(liang)(liang)(liang)(liang)(liang)和(he)很大(da)等(deng)(deng)(deng)效(xiao)串(chuan)(chuan)聯(lian)(lian)(lian)(lian)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)感(gan)。由于(yu)(yu)它(ta)的(de)(de)(de)諧(xie)振頻(pin)(pin)(pin)(pin)(pin)率(lv)(lv)(lv)很低，所(suo)以只能(neng)運用(yong)在(zai)低頻(pin)(pin)(pin)(pin)(pin)濾(lv)(lv)波上(shang)。鉭電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)容(rong)(rong)(rong)(rong)(rong)器(qi)(qi)一(yi)般都有(you)較(jiao)大(da)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)容(rong)(rong)(rong)(rong)(rong)量(liang)(liang)(liang)(liang)(liang)和(he)較(jiao)小等(deng)(deng)(deng)效(xiao)串(chuan)(chuan)聯(lian)(lian)(lian)(lian)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)感(gan)，因(yin)而它(ta)的(de)(de)(de)諧(xie)振頻(pin)(pin)(pin)(pin)(pin)率(lv)(lv)(lv)會(hui)高(gao)于(yu)(yu)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)解(jie)(jie)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)容(rong)(rong)(rong)(rong)(rong)器(qi)(qi)，并(bing)(bing)能(neng)運用(yong)在(zai)中高(gao)頻(pin)(pin)(pin)(pin)(pin)濾(lv)(lv)波上(shang)。瓷片電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)容(rong)(rong)(rong)(rong)(rong)器(qi)(qi)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)容(rong)(rong)(rong)(rong)(rong)量(liang)(liang)(liang)(liang)(liang)和(he)等(deng)(deng)(deng)效(xiao)串(chuan)(chuan)聯(lian)(lian)(lian)(lian)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)感(gan)一(yi)般都很小，因(yin)而它(ta)的(de)(de)(de)諧(xie)振頻(pin)(pin)(pin)(pin)(pin)率(lv)(lv)(lv)遠高(gao)于(yu)(yu)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)解(jie)(jie)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)容(rong)(rong)(rong)(rong)(rong)器(qi)(qi)和(he)鉭電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)容(rong)(rong)(rong)(rong)(rong)器(qi)(qi)，所(suo)以能(neng)運用(yong)在(zai)高(gao)頻(pin)(pin)(pin)(pin)(pin)濾(lv)(lv)波和(he)旁(pang)路電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)路上(shang)。由于(yu)(yu)小電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)容(rong)(rong)(rong)(rong)(rong)量(liang)(liang)(liang)(liang)(liang)瓷片電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)容(rong)(rong)(rong)(rong)(rong)器(qi)(qi)的(de)(de)(de)諧(xie)振頻(pin)(pin)(pin)(pin)(pin)率(lv)(lv)(lv)會(hui)比大(da)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)容(rong)(rong)(rong)(rong)(rong)量(liang)(liang)(liang)(liang)(liang)瓷片電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)容(rong)(rong)(rong)(rong)(rong)器(qi)(qi)的(de)(de)(de)諧(xie)振頻(pin)(pin)(pin)(pin)(pin)率(lv)(lv)(lv)要高(gao)，因(yin)此在(zai)選(xuan)擇旁(pang)路電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)容(rong)(rong)(rong)(rong)(rong)時(shi)(shi)不(bu)(bu)能(neng)光選(xuan)用(yong)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)容(rong)(rong)(rong)(rong)(rong)值過高(gao)的(de)(de)(de)瓷片電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)容(rong)(rong)(rong)(rong)(rong)器(qi)(qi)。為(wei)了改進(jin)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)容(rong)(rong)(rong)(rong)(rong)的(de)(de)(de)高(gao)頻(pin)(pin)(pin)(pin)(pin)特性(xing)，多(duo)個(ge)不(bu)(bu)同(tong)(tong)(tong)特性(xing)的(de)(de)(de)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)容(rong)(rong)(rong)(rong)(rong)器(qi)(qi)能(neng)夠并(bing)(bing)聯(lian)(lian)(lian)(lian)起來運用(yong)。a是多(duo)個(ge)不(bu)(bu)同(tong)(tong)(tong)特性(xing)的(de)(de)(de)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)容(rong)(rong)(rong)(rong)(rong)器(qi)(qi)并(bing)(bing)聯(lian)(lian)(lian)(lian)后改進(jin)的(de)(de)(de)阻(zu)抗(kang)(kang)效(xiao)果。通過剖(pou)析就不(bu)(bu)難(nan)理解(jie)(jie)此排版規矩(ju)的(de)(de)(de)重要了。b顯示了在(zai)一(yi)個(ge)PCB上(shang)輸入電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)源至(zhi)負載的(de)(de)(de)不(bu)(bu)同(tong)(tong)(tong)走線方法。為(wei)了降(jiang)低濾(lv)(lv)波電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)容(rong)(rong)(rong)(rong)(rong)器(qi)(qi)的(de)(de)(de)ESL，電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)容(rong)(rong)(rong)(rong)(rong)器(qi)(qi)引腳的(de)(de)(de)引線長度(du)應(ying)盡量(liang)(liang)(liang)(liang)(liang)減短：而VIN 正極至(zhi)及RL 和(he)VIN負極至(zhi)RL的(de)(de)(de)走線應(ying)盡量(liang)(liang)(liang)(liang)(liang)靠近。
開關電源PCB排版8個關鍵點(dian)
關鍵1、旁路瓷片電(dian)容(rong)器的電(dian)容(rong)不能(neng)太大，而(er)它(ta)的寄生(sheng)串聯電(dian)感應盡(jin)量小，多個電(dian)容(rong)并聯能(neng)改善電(dian)容(rong)的阻抗(kang)特性(xing);
關鍵2、電感的(de)寄生并聯電容應(ying)盡量小，電感引腳焊盤之(zhi)間的(de)距離越遠越好;
關鍵3、避免在地層(ceng)上放置任何(he)功率或信(xin)號走線;
關鍵4、高頻環路的(de)面積應盡(jin)或(huo)許減小;
關鍵(jian)5、過(guo)孔放置(zhi)不應破壞高頻電流(liu)在地層(ceng)上的途徑(jing);
關鍵6、體系板上一小同(tong)電(dian)路需(xu)要(yao)不(bu)同(tong)接地(di)(di)層(ceng)，小同(tong)電(dian)路的(de)接地(di)(di)層(ceng)經過單點(dian)與(yu)電(dian)源(yuan)接地(di)(di)層(ceng)相(xiang)連接;
關鍵7、控(kong)制(zhi)芯片至上端和(he)下端場效應管的驅動電(dian)路環路要盡量(liang)短;
關鍵8、開關電源功率電(dian)路和控制(zhi)信號電(dian)路元器件(jian)需要(yao)連接到小同(tong)的接地(di)層(ceng)，這二個地(di)層(ceng)一般(ban)都(dou)是經(jing)過單點相連接。
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