电机驱动芯片LMD18200原理及应用.docx

电机驱动芯片LMD18200原理及应用.docx

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电机驱动芯片LMD18200原理及应用

电机驱动芯片LMD18200原理及应用

电动机知识

电机驱动芯片LMD18200原理及应用

1、主要性能

l峰值输出电流高达6A，连续输出电流达3A,

l工作电压高达55V,

lLowRDS（ON）typically0.3Wperswitch,

lTTL/CMOS兼容电平的输入,

l无“shoot-through”电流,

l具有温度报警和过热与短路保护功能,

l芯片结温达145?

，结温达170?

时，芯片关断,

l具有良好的抗干扰性。

2、典型应用

l驱动直流电机、步机电机

l伺服机构系统位置与转速

l应用于机器人控制系统

l应用于数字控制系统

l应用于电脑打印机与绘图仪

3、内部结构和引脚说明

LMD18200外形结构如图1所示，内部电路框图2如图所示。

它有11个引脚,采用TO-220和双列直插式封装。

各引脚的功能如下:

引脚名称功能描述1、11桥臂1，2的自举输入电容连接端在脚1与脚2、脚10与脚11之间应接入10uF的自举电容2、10H桥输出端

3方向输入端转向时，输出驱动电流方向见表1。

该脚控制输出1与输出2,脚2、10,之间电流的方向，从而控制马达旋转的方向。

4刹车输入端刹车时，输出驱动电流方向见表1。

通过strengthenthesenseofresponsibility,worktosolvethelackofdecentoccupationexplainaway,conductproblems.Toestablishtheoverallconcept,eliminatedepartmentalism.Strictassessmentandaccountability,tosolvethespiritualslack,nianqingpazhong,statusquo,andotherissues.ToestablishandperfectthemuddlealongBureaustaffconductworkregulations,standardizethebehaviorofpersonnel.2.Tostrengthentheresponsibilitysystem.Oneisthein-depthstudyandimplementthe"HunanprovincialPartyandgovernmentleadingcadresInterimProvisionsontheworksafetyofapairof>（HunanOfficeissued2013No.5）,"Hunanprovincesafetysupervisionandmanagementresponsibilitiesoftheprovisionsontheproduction（HunanZhengbanmade2013No.4）Andresolutelyimplementthesafetyproductionofthepartywithresponsibility,apairofresponsibility."Twoisissuedsafetyproductionadministrationandinspectiontopromotetheresponsibilitiesbearsafetyproductionsupervisiondepartmentsstrictlyandeffectivelyassumedresponsibility.Thethreeistoestablishriskselfcorrectionselfreportingsystemforsafetyinproductionenterprises,promotetheenterprisestoimplementthemainresponsibilityforproductionsafetyisintroduced.Fourstrengthenthecountysafetyproductionsupervisionabilityconstructionwork,promotesafeproductionresponsibilitytothegrassroots.3,strictaccountabilityandtargetmanagement.Adheretothe"whoisincharge,whoisresponsibleforthepipeindustrymustbesafe,GuanShengproductionandoperationmustbesafe,pipebusinessmustcontrolsecurity"principle,theimplementationofsafetyTheproductionof"cure."stagnationsupervisionandleadershipresponsiblesystem.Thesafetyproductionofkeytowns,keyenterprisesandkeyproblems,bythetownshipgovernmentandtheDepartmentresponsibleforthestagnationledthelumpsum,totackletough.Tofurtherincreasetheproductionsafetyindexassessment,strictlyimplementthesafetyproductionofthe"onevoteveto"andtherewardsystem,strengthenthesafetyincentiveandrestraintmechanism.（six）theimplementationoftheworkforceisnotstrong.Thedocuments,meeting,longworkarrangement,checkandsupervisetheimplementationofsmall,poorimplementationofthesystem,theworkisnoteffective.Someleadingcadressenseofpurpose,consciousnessofthemassesisnotstrong,theruling"Forthepeople","theinterestsofthemassesnomatter"conceptunderstandingisnotinplace.Thespecificworktreatswiththedeployment,afewleadingcadrescomplainthatworkistoocomplicated,toomuchresponsibility,thepressureistoolarge,toomuchemphasisonthedifficultyofthework,suchasundergroundminestoavoidthedisasterof"sixsystems"constructionandconstructionofmechanicalventilationtofiletheform,forwardingarrangementswork,noin-depthminingenterprisestopromotethespecificwork,theincreaseinthenumberoffiles,buttheeffectisnotgood,notaccordingtotheactualsituationofnoncoalminesinthecounty,toengagein"acrosstheboard",andthequality

该端将马达绕组短路而使其刹车。

刹车时，将该脚置逻辑高电平，并将PWM信号输入端,脚5,置逻辑高电平，3脚的逻辑状态决定于短路马达所用的器件。

3脚为逻辑高电平时，H桥中2个高端晶体管导通,3脚呈逻辑低电平时，H桥中2个低端晶体管导通。

脚4置逻辑高电平、脚5置逻辑低电平时，H桥中所有晶体管关断，此时，每个输出端只有很小的偏流,1.5mA,。

5PWM信号输入端PWM信号与驱动电流方向的关系见表1。

该端与3脚,方向输入,如何使用，决定于PWM信号类型。

6、7电源正端与负端

8电流取样输出端提供电流取样信号，典型值为377A/A。

9温度报警输出温度报警输出，提供温度报警信号。

芯片结温达145?

时，该端变为低电平,结温达170?

时，芯片关断。

Domain:

dnf辅助More:

d2gs2f

表1LMD18200逻辑真值表PWM转向刹车实际输出驱动电流电机工作状态HHL流出1、流入2正转HLL流入1、流出2反转L×L流出1、流出2停止HHH流出1、流出2停止HLH流入1、流入2停止LXHNONE

LMD18200工作原理:

内部集成了四个DMOS管，组成一个标准的H型驱动桥。

通过充电泵电路为上桥臂的2个开关管提供栅极控制电压，充电泵电路由一个300kHz左右的工作频率。

可在引脚1、11外接电容形成第二个充电泵电路，外接电容越大，向开关管栅极输入的电容充电速度越快，电压上升的时间越短，工作频率可以更高。

引脚2、10接直流电机电枢，正转时电流的方向应该从引脚步到引脚10,反转时电流的方向应该从引脚10到引脚2。

电流检测输出引脚8可以接一个对地电阻，通过电阻来输出过流情况。

内部保护电路设置的过电流阈值为10A，当超过该值时会自动封锁输出，并周期性的自动恢复输出。

如果过电流持续strengthenthesenseofresponsibility,worktosolvethelackofdecentoccupationexplainaway,conductproblems.Toestablishtheoverallconcept,eliminatedepartmentalism.Strictassessmentandaccountability,tosolvethespiritualslack,nianqingpazhong,statusquo,andotherissues.ToestablishandperfectthemuddlealongBureaustaffconductworkregulations,standardizethebehaviorofpersonnel.2.Tostrengthentheresponsibilitysystem.Oneisthein-depthstudyandimplementthe"HunanprovincialPartyandgovernmentleadingcadresInterimProvisionsontheworksafetyofapairof>（HunanOfficeissued2013No.5）,"Hunanprovincesafetysupervisionandmanagementresponsibilitiesoftheprovisionsontheproduction（HunanZhengbanmade2013No.4）Andresolutelyimplementthesafetyproductionofthepartywithresponsibility,apairofresponsibility."Twoisissuedsafetyproductionadministrationandinspectiontopromotetheresponsibilitiesbearsafetyproductionsupervisiondepartmentsstrictlyandeffectivelyassumedresponsibility.Thethreeistoestablishriskselfcorrectionselfreportingsystemforsafetyinproductionenterprises,promotetheenterprisestoimplementthemainresponsibilityforproductionsafetyisintroduced.Fourstrengthenthecountysafetyproductionsupervisionabilityconstructionwork,promotesafeproductionresponsibilitytothegrassroots.3,strictaccountabilityandtargetmanagement.Adheretothe"whoisincharge,whoisresponsibleforthepipeindustrymustbesafe,GuanShengproductionandoperationmustbesafe,pipebusinessmustcontrolsecurity"principle,theimplementationofsafetyTheproductionof"cure."stagnationsupervisionandleadershipresponsiblesystem.Thesafetyproductionofkeytowns,keyenterprisesandkeyproblems,bythetownshipgovernmentandtheDepartmentresponsibleforthestagnationledthelumpsum,totackletough.Tofurtherincreasetheproductionsafetyindexassessment,strictlyimplementthesafetyproductionofthe"onevoteveto"andtherewardsystem,strengthenthesafetyincentiveandrestraintmechanism.（six）theimplementationoftheworkforceisnotstrong.Thedocuments,meeting,longworkarrangement,checkandsupervisetheimplementationofsmall,poorimplementationofthesystem,theworkisnoteffective.Someleadingcadressenseofpurpose,consciousnessofthemassesisnotstrong,theruling"Forthepeople","theinterestsofthemassesnomatter"conceptunderstandingisnotinplace.Thespecificworktreatswiththedeployment,afewleadingcadrescomplainthatworkistoocomplicated,toomuchresponsibility,thepressureistoolarge,toomuchemphasisonthedifficultyofthework,suchasundergroundminestoavoidthedisasterof"sixsystems"constructionandconstructionofmechanicalventilationtofiletheform,forwardingarrangementswork,noin-depthminingenterprisestopromotethespecificwork,theincreaseinthenumberoffiles,buttheeffectisnotgood,notaccordingtotheactualsituationofnoncoalminesinthecounty,toengagein"acrosstheboard",andthequality

时间较长，过热保护将关闭整个输出。

过热信号还可通过引脚9输出，当结温达到145度时引脚9有输出信号。

4、典型应用

LMD18200典型应用电路如图3所示。

LMD18200提供双极性驱动方式和单极性驱动方式。

双极性驱动是指在一个PWM周期里，电动机电枢的电压极性呈正负变化。

双极性可逆系统虽然有低速运行平稳性的优点，但也存在着电流波动大，功率损耗较大的缺点，尤其是必须增加死区来避免开关管直通的危险，限制了开关频率的提高，因此只用于中小功率直流电动机的控制。

本文中将介绍单极性可逆驱动方式。

单极性驱动方式是指在一个PWM周期内,电动机电枢只承受单极性的电压。

该应用电路是Motorola68332CPU与LMD18200接口例子，它们组成了一个单极性驱动直流电机的闭环控制电路。

在这个电路中，PWM控制信号是通过引脚5输入的，而转向信号则通过引脚3输入。

根据PWM控制信号的占空比来决定直流电机的转速和转向。

采用一个增量型光电编码器来反馈电动机的实际位置，输出AB两相，检测电机转速和位置，形成闭环位置反馈，从而达到精确控制电机。

5、结束语

电动机的数字控制是电动机控制的发展趋势，用单片机对电动机进行控制是实现电动机数字控制的最常用的手段。

使用专门的电机控制芯片LMD18200可以减轻单片机负担，工作更可靠。

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strengthenthesenseofresponsibility,worktosolvethelackofdecentoccupationexplainaway,conductproblems.Toestablishtheoverallconcept,eliminatedepartmentalism.Strictassessmentandaccountability,tosolvethespiritualslack,nianqingpazhong,statusquo,andotherissues.ToestablishandperfectthemuddlealongBureaustaffconductworkregulations,standardizethebehaviorofpersonnel.2.Tostrengthentheresponsibilitysystem.Oneisthein-depthstudyandimplementthe"HunanprovincialPartyandgovernmentleadingcadresInterimProvisionsontheworksafetyofapairof>（HunanOfficeissued2013No.5）,"Hunanprovincesafetysupervisionandmanagementresponsibilitiesoftheprovisionsontheproduction（HunanZhengbanmade2013No.4）Andresolutelyimplementthesafetyproductionofthepartywithresponsibility,apairofresponsibility."Twoisissuedsafetyproductionadministrationandinspectiontopromotetheresponsibilitiesbearsafetyproductionsupervisiondepartmentsstrictlyandeffectivelyassumedresponsibility.Thethreeistoestablishriskselfcorrectionselfreportingsystemforsafetyinproductionenterprises,promotetheenterprisestoimplementthemainresponsibilityforproductionsafetyisintroduced.Fourstrengthenthecountysafetyproductionsupervisionabilityconstructionwork,promotesafeproductionresponsibilitytothegrassroots.3,strictaccountabilityandtargetmanagement.Adheretothe"whoisincharge,whoisresponsibleforthepipeindustrymustbesafe,GuanShengproductionandoperationmustbesafe,pip