lm7805中文资料-lm7805应用电路、参数、型号和管脚分布

lm7805介绍

lm7805中文资料，先来(lai)(lai)(lai)简单介绍(shao)一(yi)下lm7805 用(yong)lm78/lm79系列三(san)端(duan)稳(wen)压IC来(lai)(lai)(lai)组成稳(wen)压电(dian)源所需的(de)外围元(yuan)件极少，电(dian)路(lu)内(nei)部还有过(guo)流、过(guo)热及调整(zheng)管(guan)的(de)保护电(dian)路(lu)，使用(yong)起来(lai)(lai)(lai)可靠、方便，而且价格便宜(yi)。

该系列集(ji)成稳压(ya)IC型号中(zhong)的lm78或lm79后面的数字代表(biao)(biao)该三端集(ji)成稳压(ya)电(dian)路的输(shu)(shu)出电(dian)压(ya)，如lm7806表(biao)(biao)示输(shu)(shu)出电(dian)压(ya)为(wei)正6V，lm7909表(biao)(biao)示输(shu)(shu)出电(dian)压(ya)为(wei)负9V。

因(yin)为三端(duan)固(gu)定集成稳压(ya)电(dian)路的使用(yong)方便，电(dian)子制(zhi)作中经(jing)常采用(yong)。 最(zui)大输出(chu)电(dian)流1.5A，LM78XX系列输出(chu)电(dian)压(ya)分别为5V;6V;8V;9V;10V;12V;15V;18V;24V。

lm7805应用电路

lm7805中文资(zi)料(liao)之应(ying)用(yong)电路(lu)，lm7805典(dian)型(xing)应(ying)用(yong)电路(lu)图: lm78XX系列集(ji)成(cheng)稳压器(qi)的典(dian)型(xing)应(ying)用(yong)电路(lu)图，是一个输出正5V直(zhi)流电(dian)压的(de)稳压电源电路。IC采集成稳压器lm7805，C1、C2分别为输入(ru)端和(he)输出端滤波电容(rong)，RL为负载电阻。当(dang)输出电流较(jiao)大时，lm7805应配上散热板(ban)。

为提高输(shu)出(chu)(chu)电(dian)(dian)(dian)压(ya)(ya)(ya)(ya)的应用电(dian)(dian)(dian)路。稳(wen)(wen)(wen)压(ya)(ya)(ya)(ya)二(er)极管(guan)VD1串接在(zai)lm78XX稳(wen)(wen)(wen)压(ya)(ya)(ya)(ya)器2脚与(yu)地之(zhi)间，可使(shi)输(shu)出(chu)(chu)电(dian)(dian)(dian)压(ya)(ya)(ya)(ya)Uo得到一定的提高，输(shu)出(chu)(chu)电(dian)(dian)(dian)压(ya)(ya)(ya)(ya)Uo为78XX稳(wen)(wen)(wen)压(ya)(ya)(ya)(ya)器输(shu)出(chu)(chu)电(dian)(dian)(dian) 压(ya)(ya)(ya)(ya)与(yu)稳(wen)(wen)(wen)压(ya)(ya)(ya)(ya)二(er)极管(guan)VC1稳(wen)(wen)(wen)压(ya)(ya)(ya)(ya)值(zhi)之(zhi)和(he)。VD2是(shi)输(shu)出(chu)(chu)保护二(er)极管(guan)，一旦输(shu)出(chu)(chu)电(dian)(dian)(dian)压(ya)(ya)(ya)(ya)低于(yu)VD1稳(wen)(wen)(wen)压(ya)(ya)(ya)(ya)值(zhi)时，VD2导通，将输(shu)出(chu)(chu)电(dian)(dian)(dian)流(liu)旁(pang)路，保护lm7800稳(wen)(wen)(wen)压(ya)(ya)(ya)(ya)器输(shu)出(chu)(chu)级不被(bei)损坏。

为输(shu)出(chu)电(dian)(dian)压(ya)可(ke)(ke)在(zai)一定(ding)范围内(nei)调(diao)节(jie)的(de)(de)应用电(dian)(dian)路。由(you)于R1、RP电(dian)(dian)阻网络的(de)(de)作用，使得输(shu)出(chu)电(dian)(dian)压(ya)被提(ti)高，提(ti)高的(de)(de)幅(fu)度取(qu)决(jue)于RP与R1的(de)(de)比值。调(diao)节(jie)电(dian)(dian)位器RP，即(ji) 可(ke)(ke)一定(ding)范围内(nei)调(diao)节(jie)输(shu)出(chu)电(dian)(dian)压(ya)。当RP=0时，输(shu)出(chu)电(dian)(dian)压(ya)Uo等于lm78XX稳(wen)压(ya)器输(shu)出(chu)电(dian)(dian)压(ya)；当RP逐(zhu)步增(zeng)大时，Uo也随之逐(zhu)步提(ti)高。

为扩大输(shu)出电(dian)流(liu)的应(ying)用电(dian)路。VT2为外接(jie)(jie)扩流(liu)率管，VT1为推动管，二者(zhe)为达林顿连接(jie)(jie)。R1为偏置电(dian)阻。该(gai)电(dian)路最大输(shu)出电(dian)流(liu)取决于VT2的参数。

lm7805电参数

lm7805中文资料(liao)的参数如下图：

lm7805中文资料-三端稳压器的型号规格(ge)和(he)管脚分(fen)布

例(li)如(ru)：78M05三端(duan)稳(wen)压(ya)器可输(shu)出+5 V、0.5 A的稳(wen)定(ding)(ding)电(dian)压(ya);7912三端(duan)稳(wen)压(ya)器可输(shu)出 12V、1A的稳(wen)定(ding)(ding)电(dian)压(ya)。

外形及(ji)管(guan)脚分布，如附下(xia)图所(suo)示。

由(you)7805，7905，7812组(zu)成的特殊的线性(xing)稳压电源(yuan)

如图所示为一种特(te)殊(shu)的(de)电(dian)(dian)(dian)(dian)源电(dian)(dian)(dian)(dian)路(lu)(lu)。该电(dian)(dian)(dian)(dian)路(lu)(lu)虽然简单(dan)，但可以从两个相同的(de)次级绕组(zu)中产(chan)生出三组(zu)直流(liu)电(dian)(dian)(dian)(dian)压(ya)：+5V、-5V和+12V。其(qi)特(te)点是(shi)：D2、D3跨接在E2、E3这两组(zu)交(jiao)流(liu)电(dian)(dian)(dian)(dian)源之间，起着全波整(zheng)流(liu)的(de)作用。

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