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电(dian)子产品一般(ban)三端(duan)稳压集(ji)成(cheng)电(dian)路有一个正电(dian)压输(shu)(shu)(shu)出(chu)78xx系列79x系列和(he)负电(dian)压输(shu)(shu)(shu)出(chu)。因此,公(gong)义,三端(duan)集(ji)成(cheng)电(dian)路是指(zhi)电(dian)压调整器和(he)集(ji)成(cheng)电(dian)路和(he)三针(zhen)输(shu)(shu)(shu)出(chu),输(shu)(shu)(shu)入,接(jie)地端(duan)和(he)输(shu)(shu)(shu)出(chu)端(duan)。它看起来像普(pu)通三极管(guan)、TO-220标(biao)准封装(zhuang),有9013-92封装(zhuang)的(de)。

用78/79系(xi)列三端稳(wen)(wen)压(ya)(ya)集(ji)成(cheng)(cheng)电(dian)(dian)路形成(cheng)(cheng)几个外围组件(jian)所需(xu)的(de)(de)(de)稳(wen)(wen)压(ya)(ya)电(dian)(dian)源,内(nei)部电(dian)(dian)路和过流(liu)、过热和调整管(guan)保(bao)护电(dian)(dian)路,而且(qie)价(jia)格(ge)便宜。这(zhei)一系(xi)列的(de)(de)(de)集(ji)成(cheng)(cheng)稳(wen)(wen)压(ya)(ya)集(ji)成(cheng)(cheng)电(dian)(dian)路模(mo)型在78或79的(de)(de)(de)数(shu)字代表(biao)(biao)三端集(ji)成(cheng)(cheng)稳(wen)(wen)压(ya)(ya)电(dian)(dian)路的(de)(de)(de)输(shu)出电(dian)(dian)压(ya)(ya),如7806表(biao)(biao)示输(shu)出电(dian)(dian)压(ya)(ya)6v,79099v输(shu)出电(dian)(dian)压(ya)(ya)是(shi)负的(de)(de)(de)。78/79系(xi)列的(de)(de)(de)三端稳(wen)(wen)压(ya)(ya)IC有很多电(dian)(dian)子(zi)产品(pin)(pin)制造商(shang),在80年代,通(tong)常一个前缀的(de)(de)(de)代码(ma),比(bi)如TA7805是(shi)东(dong)芝(zhi)产品(pin)(pin),AN7909是(shi)松下的(de)(de)(de)产品(pin)(pin)。

有时(shi)在(zai)78或78L和M或数量,如78m12或79l24,用来区分输出(chu)(chu)电(dian)(dian)流和包装(zhuang)形式,等(deng)等(deng),其(qi)中78L系(xi)列(lie)(lie)的(de)(de)最(zui)(zui)大输出(chu)(chu)电(dian)(dian)流100毫安,78系(xi)列(lie)(lie)最(zui)(zui)大输出(chu)(chu)电(dian)(dian)流是1、78系(xi)列(lie)(lie),最(zui)(zui)大输出(chu)(chu)电(dian)(dian)流1.5a。它也有各种各样的(de)(de)封(feng)装(zhuang),如图表所示。塑料封(feng)装(zhuang)的(de)(de)调节电(dian)(dian)路具有安装(zhuang)方便,价格低廉,所以(yi)更(geng)多。79系(xi)列(lie)(lie)除(chu)了输出(chu)(chu)电(dian)(dian)压是负的(de)(de)。导致安排不(bu)同的(de)(de)脚,命(ming)名方法(fa),如形状(zhuang)是一样的(de)(de)78系(xi)列(lie)(lie)。

因为三(san)个(ge)固(gu)定集(ji)成稳(wen)(wen)压(ya)(ya)(ya)电(dian)(dian)(dian)(dian)路(lu)容易使用(yong)(yong),常(chang)用(yong)(yong)于(yu)电(dian)(dian)(dian)(dian)子(zi)产(chan)品,可以用(yong)(yong)于(yu)修改(gai)的(de)分立元件稳(wen)(wen)压(ya)(ya)(ya)电(dian)(dian)(dian)(dian)源,也(ye)经常(chang)用(yong)(yong)作(zuo)电(dian)(dian)(dian)(dian)力电(dian)(dian)(dian)(dian)子(zi)器(qi)件的(de)工作(zuo)。电(dian)(dian)(dian)(dian)路(lu)图如图所示(shi)。注意三(san)端集(ji)成稳(wen)(wen)压(ya)(ya)(ya)电(dian)(dian)(dian)(dian)路(lu)的(de)输(shu)(shu)(shu)(shu)入,输(shu)(shu)(shu)(shu)出(chu)(chu)(chu),和(he)接地(di)端必须(xu)不(bu)是错误的(de),不(bu)容易烧坏。一(yi)般三(san)端集(ji)成稳(wen)(wen)压(ya)(ya)(ya)电(dian)(dian)(dian)(dian)路(lu)的(de)最小输(shu)(shu)(shu)(shu)入和(he)输(shu)(shu)(shu)(shu)出(chu)(chu)(chu)电(dian)(dian)(dian)(dian)压(ya)(ya)(ya)差的(de)2v,否则不(bu)能稳(wen)(wen)定的(de)输(shu)(shu)(shu)(shu)出(chu)(chu)(chu)电(dian)(dian)(dian)(dian)压(ya)(ya)(ya),应该保持电(dian)(dian)(dian)(dian)压(ya)(ya)(ya)差一(yi)般在4到5v,即(ji)变压(ya)(ya)(ya)器(qi)变压(ya)(ya)(ya)器(qi)、二极管整(zheng)流器(qi),电(dian)(dian)(dian)(dian)容滤波后的(de)电(dian)(dian)(dian)(dian)压(ya)(ya)(ya)应该高于(yu)调节值。

在(zai)(zai)实践(jian)中,应(ying)该(gai)在(zai)(zai)三(san)个(ge)集成稳(wen)压(ya)电(dian)路(lu)安装(zhuang)散热器足(zu)够大(小功(gong)率条(tiao)件下不,当然)。稳(wen)压(ya)管温度过(guo)高时,电(dian)压(ya)稳(wen)定性能将变得更糟,甚至伤害。当需要可以输(shu)出(chu)一(yi)个(ge)1。超过(guo)5电(dian)流稳(wen)压(ya)电(dian)源,通常需要几三(san)端稳(wen)压(ya)电(dian)路(lu)并(bing)(bing)联为1.5n的(de)(de)最(zui)大输(shu)出(chu)电(dian)流,但(dan)在(zai)(zai)应(ying)用(yong)时必须注意(yi)到:并(bing)(bing)行的(de)(de)集成稳(wen)压(ya)电(dian)路(lu)应(ying)该(gai)使(shi)用(yong)相(xiang)同(tong)的(de)(de)制造商,同(tong)一(yi)批次的(de)(de)产品,以确保参数的(de)(de)一(yi)致。额外津贴(tie)必须输(shu)出(chu)电(dian)流,为了(le)避免单个(ge)集成稳(wen)压(ya)电(dian)路(lu)故障原因(yin)链燃烧(shao)在(zai)(zai)其(qi)他(ta)电(dian)路(lu)。

在78,79**系(xi)列(lie)三端(duan)稳压(ya)器是(shi)最(zui)常用(yong)在-220,-202,两种(zhong)包(bao)装(zhuang)。这(zhei)两种(zhong)包(bao)装(zhuang)图(tu)(tu)形和(he)密码,密码函数如附(fu)图(tu)(tu)所示。销数图(tu)(tu)中(zhong)标记方法是(shi)按(an)照订单销潜(qian)(qian)在的高(gao)分(fen)。很容易记祝销(1)为最(zui)高(gao)潜(qian)(qian)力(li)(li),(3)脚最(zui)低(di)的潜(qian)(qian)力(li)(li),(2)中(zhong)心，从图(tu)(tu)可(ke)以看出,正(zheng)压(ya)和(he)负压(ya),(2)脚输出。**78系(xi)列(lie)正(zheng)压(ya),输入是(shi)最(zui)高(gao)的潜(qian)(qian)力(li)(li),自(zi)然(ran)是(shi)(1)脚,最(zui)低(di)可(ke)能结束(shu),或(3)脚,如附(fu)图(tu)(tu)所示。

79**负(fu)压系(xi)(xi)列,输入(ru)最低的(de)(de)潜(qian)力(li),自然是3英尺,和(he)结束(shu)最高的(de)(de)潜(qian)力(li),即(1),如附图所(suo)示。此外,还(hai)应注意(yi),散热(re)器总是第一(yi)个(3)连接(jie)到脚和(he)最低的(de)(de)潜(qian)力(li)。所(suo)以在78**系(xi)(xi)列、散热(re)片和(he)连接(jie),并在79**系(xi)(xi)列、散热(re)器和(he)输入(ru)的(de)(de)连接(jie)。

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