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电(dian)(dian)(dian)(dian)子产品一(yi)般(ban)三(san)(san)(san)端(duan)稳压(ya)集成(cheng)电(dian)(dian)(dian)(dian)路(lu)有一(yi)个(ge)正电(dian)(dian)(dian)(dian)压(ya)输(shu)出78xx系列79x系列和(he)负电(dian)(dian)(dian)(dian)压(ya)输(shu)出。因(yin)此,公义,三(san)(san)(san)端(duan)集成(cheng)电(dian)(dian)(dian)(dian)路(lu)是指电(dian)(dian)(dian)(dian)压(ya)调整器和(he)集成(cheng)电(dian)(dian)(dian)(dian)路(lu)和(he)三(san)(san)(san)针输(shu)出,输(shu)入,接地端(duan)和(he)输(shu)出端(duan)。它看(kan)起来像普通三(san)(san)(san)极(ji)管、TO-220标准封装,有9013-92封装的(de)。

用78/79系(xi)列(lie)三端稳压(ya)(ya)(ya)(ya)集成电(dian)(dian)路(lu)形成几个外围组(zu)件(jian)所(suo)需的(de)(de)(de)(de)稳压(ya)(ya)(ya)(ya)电(dian)(dian)源,内(nei)部电(dian)(dian)路(lu)和过流、过热和调整管保(bao)护电(dian)(dian)路(lu),而且价格便宜(yi)。这一系(xi)列(lie)的(de)(de)(de)(de)集成稳压(ya)(ya)(ya)(ya)集成电(dian)(dian)路(lu)模型在78或79的(de)(de)(de)(de)数字(zi)代(dai)表三端集成稳压(ya)(ya)(ya)(ya)电(dian)(dian)路(lu)的(de)(de)(de)(de)输出(chu)电(dian)(dian)压(ya)(ya)(ya)(ya),如(ru)7806表示输出(chu)电(dian)(dian)压(ya)(ya)(ya)(ya)6v,79099v输出(chu)电(dian)(dian)压(ya)(ya)(ya)(ya)是负的(de)(de)(de)(de)。78/79系(xi)列(lie)的(de)(de)(de)(de)三端稳压(ya)(ya)(ya)(ya)IC有很多电(dian)(dian)子产品(pin)制造商,在80年(nian)代(dai),通常一个前缀的(de)(de)(de)(de)代(dai)码,比(bi)如(ru)TA7805是东芝产品(pin),AN7909是松(song)下(xia)的(de)(de)(de)(de)产品(pin)。

有(you)时在78或78L和(he)M或数量,如78m12或79l24,用来区分输(shu)出(chu)(chu)(chu)电(dian)(dian)流(liu)和(he)包装形式,等等,其(qi)中78L系列的(de)最大(da)输(shu)出(chu)(chu)(chu)电(dian)(dian)流(liu)100毫安,78系列最大(da)输(shu)出(chu)(chu)(chu)电(dian)(dian)流(liu)是(shi)(shi)1、78系列,最大(da)输(shu)出(chu)(chu)(chu)电(dian)(dian)流(liu)1.5a。它也有(you)各种(zhong)各样的(de)封(feng)装,如图(tu)表所示。塑料封(feng)装的(de)调节电(dian)(dian)路具(ju)有(you)安装方便,价格低(di)廉,所以更多。79系列除了输(shu)出(chu)(chu)(chu)电(dian)(dian)压是(shi)(shi)负的(de)。导致安排不同(tong)的(de)脚,命名方法,如形状是(shi)(shi)一样的(de)78系列。

因为三个固(gu)定集(ji)成稳(wen)(wen)压(ya)电(dian)(dian)路(lu)容(rong)(rong)易使(shi)用,常(chang)用于电(dian)(dian)子产品(pin),可以用于修(xiu)改(gai)的(de)分立元件稳(wen)(wen)压(ya)电(dian)(dian)源(yuan),也(ye)经常(chang)用作电(dian)(dian)力电(dian)(dian)子器(qi)件的(de)工作。电(dian)(dian)路(lu)图如图所示。注(zhu)意三端集(ji)成稳(wen)(wen)压(ya)电(dian)(dian)路(lu)的(de)输(shu)(shu)(shu)入(ru),输(shu)(shu)(shu)出,和接地端必(bi)须(xu)不是(shi)错误的(de),不容(rong)(rong)易烧(shao)坏。一般三端集(ji)成稳(wen)(wen)压(ya)电(dian)(dian)路(lu)的(de)最小输(shu)(shu)(shu)入(ru)和输(shu)(shu)(shu)出电(dian)(dian)压(ya)差的(de)2v,否(fou)则不能稳(wen)(wen)定的(de)输(shu)(shu)(shu)出电(dian)(dian)压(ya),应(ying)该保持电(dian)(dian)压(ya)差一般在4到5v,即变压(ya)器(qi)变压(ya)器(qi)、二极管整流器(qi),电(dian)(dian)容(rong)(rong)滤波后的(de)电(dian)(dian)压(ya)应(ying)该高于调节值(zhi)。

在(zai)实践中,应(ying)该(gai)在(zai)三(san)个集(ji)成稳压(ya)电(dian)(dian)(dian)(dian)路(lu)(lu)(lu)安装散热(re)器足够(gou)大(小功率条(tiao)件下不(bu),当然)。稳压(ya)管温度过(guo)高时(shi),电(dian)(dian)(dian)(dian)压(ya)稳定性能(neng)将变(bian)得更(geng)糟,甚至伤(shang)害。当需(xu)(xu)要(yao)可以输(shu)出一个1。超过(guo)5电(dian)(dian)(dian)(dian)流(liu)(liu)稳压(ya)电(dian)(dian)(dian)(dian)源(yuan),通常需(xu)(xu)要(yao)几三(san)端稳压(ya)电(dian)(dian)(dian)(dian)路(lu)(lu)(lu)并联(lian)为(wei)1.5n的(de)最大输(shu)出电(dian)(dian)(dian)(dian)流(liu)(liu),但在(zai)应(ying)用(yong)时(shi)必须注(zhu)意到:并行的(de)集(ji)成稳压(ya)电(dian)(dian)(dian)(dian)路(lu)(lu)(lu)应(ying)该(gai)使(shi)用(yong)相同(tong)的(de)制造商,同(tong)一批次的(de)产(chan)品,以确保参(can)数的(de)一致。额外津(jin)贴必须输(shu)出电(dian)(dian)(dian)(dian)流(liu)(liu),为(wei)了避免单个集(ji)成稳压(ya)电(dian)(dian)(dian)(dian)路(lu)(lu)(lu)故(gu)障原因链燃烧在(zai)其他电(dian)(dian)(dian)(dian)路(lu)(lu)(lu)。

在78,79**系列三端稳(wen)压(ya)器是最常用(yong)在-220,-202,两种包装。这两种包装图(tu)形和(he)密码,密码函数如(ru)附图(tu)所示。销数图(tu)中(zhong)标记方法是按照订单销潜在的高(gao)分。很容易(yi)记祝销(1)为最高(gao)潜力(li),(3)脚最低(di)的潜力(li),(2)中(zhong)心，从(cong)图(tu)可以看出,正(zheng)压(ya)和(he)负压(ya),(2)脚输出。**78系列正(zheng)压(ya),输入(ru)是最高(gao)的潜力(li),自然(ran)是(1)脚,最低(di)可能结束(shu),或(huo)(3)脚,如(ru)附图(tu)所示。

79**负压系列(lie),输(shu)入最低(di)的潜(qian)力(li),自然是(shi)3英尺,和(he)结(jie)束最高的潜(qian)力(li),即(ji)(1),如附图所示(shi)。此外,还(hai)应(ying)注意,散热(re)器总是(shi)第一个(3)连(lian)接(jie)到(dao)脚和(he)最低(di)的潜(qian)力(li)。所以在(zai)78**系列(lie)、散热(re)片和(he)连(lian)接(jie),并(bing)在(zai)79**系列(lie)、散热(re)器和(he)输(shu)入的连(lian)接(jie)。

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