📄 34063.htm
字号:
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<!-- saved from url=(0047)http://www.nomad.ee/micros/mc34063a/index.shtml -->
<HTML><HEAD><TITLE>MC34063A design tool</TITLE><!-- #BeginTemplate "/Templates/nomad.dwt" --><LINK
href="/favicon.ico" rel=icon type=image/ico><LINK href="/favicon.ico"
rel="SHORTCUT ICON"><!-- #BeginEditable "header" --><!-- #EndEditable -->
<META content="text/html; charset=gb2312" http-equiv=Content-Type><LINK
href="MC34063A design tool.files/nomad.css" rel=stylesheet>
<META content="Microsoft FrontPage 4.0" name=GENERATOR></HEAD>
<BODY aLink=#cc0033 bgColor=#ffffff link=#3333ff text=#000000 vLink=#003399><!-- #BeginEditable "page" -->
<SCRIPT language=javascript>
/*
This code is (c) Nomad Systems 2001,
http://www.nomad.ee
Feel free to use and modify, but give credits when credits are due.
A comment line would be nice.
*/
var vin; // input voltage
var vout; // output voltage
var iout; // output current
var vripple; // ripple voltage (peak to peak)
var fmin; // minimum switching freq
var vsat=1.0; // switch transistor saturation voltage
var vf=0.4; // rectifier forward drop
var r1;
var r2;
var r48=new Array(
1.0, 1.1, 1.2, 1.3, 1.5, 1.6, 1.8, 2.0, 2.2, 2.4, 2.7, 3.0,
3.3, 3.6, 3.9, 4.3, 4.7, 5.1, 5.6, 6.2, 6.8, 7.5, 8.2, 9.1,
10.0, 11.0, 12.0, 13.0, 15.0, 16.0, 18.0, 20.0, 22.0, 24.0, 27.0, 30.0,
33.0, 36.0, 39.0, 43.0, 47.0, 51.0, 56.0, 62.0, 68.0, 75.0, 82.0, 91.0);
// choose feedback resistors for output voltage vo
// output voltage is Vout=1.25(1+R2/R1)
//
function calcr1r2(vo)
{
var bv=vo*1000;
var i;
var j;
vo=Math.abs(vo);
for (j=0;j<48;j++) // go through R1 values
{
for (i=0;i<48;i++) // and try all R2 values
{
v=1.25*(1+(r48[i]/r48[j]));
if (Math.abs(vo-v)<Math.abs(vo-bv))
{
r2=r48[i];
r1=r48[j];
bv=v;
}
}
}
return bv;
}
function calculate()
{
var tontoff; // ton/toff ratio
var ton; // switch on time
var toff; // switch off time
var ipk; // switch peak current
var rsc; // sense current resistor
var lmin; // minimum indictor value
var avo; // actual vout
// take entered values from form
r1=r2=0;
vin=parseFloat(document.forms["input"].elements["vin"].value);
vout=parseFloat(document.forms["input"].elements["vout"].value);
iout=parseFloat(document.forms["input"].elements["iout"].value)/1000;
vripple=parseFloat(document.forms["input"].elements["vripple"].value)/1000;
fmin=parseFloat(document.forms["input"].elements["fmin"].value)*1000;
if (vin>40 || vin<3)
{
alert("Vin must be 3 to 40 volts");
return;
}
if (Math.abs(vin-vout)<(vsat+vf))
{
alert("No suitable configuration for Vout at this Vin!");
return;
}
avo=calcr1r2(vout);
// choose architecture
if (vout>vin)
{
document.images["schematics"].src="stepup.gif";
// calculate some temporary values
tontoff=(vout+vf-vin)/(vin-vsat);
sumtontoff=1/fmin;
toff=sumtontoff/(tontoff+1);
ton=sumtontoff-toff;
// calculate components
ct=(4.0*0.00001*ton)*1000000000000;
ipk=2*iout*(tontoff+1);
if (ipk*1000>1500)
alert("Switch peak current "+Math.floor(ipk*1000)+"mA exceeds 1500mA limit!");
rsc=0.3/ipk;
lmin=(((vin-vsat)/ipk)*ton)*1000000;
co=9*((iout*ton)/vripple)*1000000;
document.forms["input"].elements["result"].value=
"Ct="+Math.round(ct)+" pF\n"+
"Ipk="+Math.round(ipk*1000)+" mA\n"+
"Rsc="+Math.round(rsc*1000)/1000+" Ohm\n"+
"Lmin="+Math.round(lmin)+" uH\n"+
"Co="+Math.round(co)+" uF\n"+
"R=180 Ohm\n"+
"R1="+r1+"k R2="+r2+"k ("+Math.round(avo*100.0)/100.0+"V)";
}
else
{
if (vout<0)
{
document.images["schematics"].src="inverter.gif";
// calculate some temporary values
tontoff=(Math.abs(vout)+vf)/(vin-vsat);
sumtontoff=1/fmin;
toff=sumtontoff/(tontoff+1);
ton=sumtontoff-toff;
// calculate components
ct=(4.0*0.00001*ton)*1000000000000;
ipk=2*iout*(tontoff+1);
if (ipk*1000>1500)
alert("Switch peak current "+Math.floor(ipk*1000)+"mA exceeds 1500mA limit!");
rsc=0.3/ipk;
lmin=(((vin-vsat)/ipk)*ton)*1000000;
co=9*((iout*ton)/vripple)*1000000;
document.forms["input"].elements["result"].value=
"Ct="+Math.round(ct)+" pF\n"+
"Ipk="+Math.round(ipk*1000)+" mA\n"+
"Rsc="+Math.round(rsc*1000)/1000+" Ohm\n"+
"Lmin="+Math.round(lmin)+" uH\n"+
"Co="+Math.round(co)+" uF\n"+
"R1="+r1+"k R2="+r2+"k ("+Math.round(avo*100.0)/100.0+"V)";
}
else
{
document.images["schematics"].src="stepdown.gif";
// calculate some temporary values
tontoff=(vout+vf)/(vin-vsat-vout);
sumtontoff=1/fmin;
toff=sumtontoff/(tontoff+1);
ton=sumtontoff-toff;
// calculate components
ct=(4.0*0.00001*ton)*1000000000000;
ipk=2*iout;
if (ipk*1000>1500)
alert("Switch peak current "+Math.floor(ipk*1000)+"mA exceeds 1500mA limit!");
rsc=0.3/ipk;
lmin=(((vin-vsat-vout)/ipk)*ton)*1000000;
co=((ipk*sumtontoff)/(8*vripple))*1000000;
document.forms["input"].elements["result"].value=
"Ct="+Math.round(ct)+" pF\n"+
"Ipk="+Math.round(ipk*1000)+" mA\n"+
"Rsc="+Math.round(rsc*1000)/1000+" Ohm\n"+
"Lmin="+Math.round(lmin)+" uH\n"+
"Co="+Math.round(co)+" uF\n"+
"R1="+r1+"k R2="+r2+"k ("+Math.round(avo*100.0)/100.0+"V)";
}
}
}
</SCRIPT>
<DIV align=center style="width: 677; height: 571">
<H3><font color="#FF0000">MC34063或IRM03A接成标准的DC—DC</font></H3>
<H3><font color="#FF0000">1：极性反转。2：升压。3：降压。三种典型电路时，外围元件参数的自动计算</font></H3>
<p align="left"><font color="#0000FF">使用方法：</font><font color="#008080">只要在左中部框中输入你想要的参数，然后点击“进行计算并且刷新电路图”按钮，它就可以自动给所有相关的外围元件参数和相对应的标准电路图纸，使设计DC—DC电路实现智能化高效化。</font><font color="#0000FF">关于警告：</font><font color="#008080">如果您输入的参数超过了34063的极限，它会自动弹出警告窗口提醒您更改它们。</font><font color="#0000FF">特殊输入</font><font color="#008080">：要设计极性反转电路请在输入或输出电压数字的前面加上负号，比如－5V。</font></p>
<TABLE border=0 width=700>
<TBODY>
<TR>
<TD>
<P> 这是一种用于DC－DC电源变换的集成电路，应用比较广泛，通用廉价易购。极性反转效率最高６５％，升压效率最高９０％，降压效率最高８０％，变换效率和工作频率滤波电容等成正比。</P>
<P>另外，输出功率达不到要求的时候，比如＞250～300MA时，可以通过外接扩功率管的方法扩大电流，双极型或MOS型 扩流管均可，计算公式和其他参数及其含义详见最下部详细介绍即可。</P>
</TD></TR></TBODY></TABLE>
<TABLE border=0 width=700>
<TBODY>
<TR>
<TD vAlign=top width=200>
<FORM action="" name=input>
<TABLE border=0 width=217 name="values">
<TBODY>
<TR>
<TD align=right width=58>输入电压 </TD>
<TD width=69><INPUT name=vin size=10> </TD>
<TD align=left width=30>V </TD></TR>
<TR>
<TD align=right width=58>输出电压 </TD>
<TD width=69><INPUT name=vout size=10> </TD>
<TD align=left width=30>V </TD></TR>
<TR>
<TD align=right width=58>输出电流 </TD>
<TD width=69><INPUT name=iout size=10> </TD>
<TD align=left width=30>mA </TD></TR>
<TR>
<TD align=right width=58>输出电压波纹系数 </TD>
<TD width=69><INPUT name=vripple size=10> </TD>
<TD align=left width=30>mV(pp) </TD></TR>
<TR>
<TD align=right width=58>工作频率 </TD>
<TD width=69><INPUT name=fmin size=10> </TD>
<TD align=left width=30>kHz </TD></TR>
<TR>
<TD align=right width=157 colspan="3"><INPUT name=button onclick=calculate(); size=10 type=button value=进行计算并且刷新电路图>
</TD>
</TR></TBODY></TABLE><TEXTAREA cols=28 name=result rows=8 wrap=off> </TEXTAREA>
</FORM></TD>
<TD width=500><IMG name=schematics
src="MC34063A design tool.files/inverter.gif" width="464" height="417"> </TD></TR></TBODY></TABLE></DIV><!-- #EndEditable --><!-- #EndTemplate -->
<p><font color="#FF0000">外围元件标称含义和它们取值的</font><font color="#FF0000">计算公式：</font></p>
<p><font color="#FF0000">Vout</font>(输出电压)＝1.25V（１＋R1／R2）</p>
<p><font color="#FF0000">Ct</font><font color="#000000">(</font>定时电容<font color="#000000">)</font>：决定内部工作频率。Ct=0.000 004*Ton(工作频率）</p>
<p><font color="#FF0000">Ipk</font>=2*Iomax*T/toff</p>
<p><font color="#FF0000">Rsc</font><font color="#000000">(</font>限流电阻)：决定输出电流。Rsc＝0.33／Ipk</p>
<p><font color="#FF0000">Lmin</font><font color="#000000">(</font>电感)：Lmin＝(Vimin－Vces)*Ton/ Ipk</p>
<p><font color="#FF0000">Co</font>(滤波电容)：决定输出电压波纹系数，Co＝Io*ton/Vp-p(波纹系数）</p>
<p>固定值参数：</p>
<p>Vces=1.0V ton/toff=(Vo+Vf－Vimin)/(Vimin－Vces） Vimin:输入电压不稳定时的最小值 </p>
<p>Vf=1.2V 快速开关二极管正向压降</p>
<p><font color="#FF0000">其他手册参数：</font></p>
<table border="1" width="100%">
<tr>
<td width="20%" align="center"> 参数名称</td>
<td width="17%" align="center">符号</td>
<td width="15%" align="center">单位</td>
<td width="22%" align="center">MC34063（美国Motorola公司）</td>
<td width="31%" align="center">ＣＷ34063（国产）</td>
<td width="15%" align="center">IRM03A（日本夏普公司）</td>
</tr>
<tr>
<td width="20%" align="center">输入电压</td>
<td width="17%" align="center">Vin</td>
<td width="15%" align="center">V</td>
<td width="22%" align="center">2.5～40V</td>
<td width="31%" align="center">2.5～40V</td>
<td width="15%" align="center">2.5～40V</td>
</tr>
<tr>
<td width="20%" align="center">输出电压</td>
<td width="17%" align="center">Vout</td>
<td width="15%" align="center">V</td>
<td width="22%" align="center">1.25～40V</td>
<td width="31%" align="center">1.25～40V</td>
<td width="15%" align="center">1.25～40V</td>
</tr>
<tr>
<td width="20%" align="center">最大输出电流</td>
<td width="17%" align="center">Iomax</td>
<td width="15%" align="center">A</td>
<td width="22%" align="center">1.5A</td>
<td width="31%" align="center">1.5A</td>
<td width="15%" align="center">1.8A</td>
</tr>
<tr>
<td width="20%" align="center">最高工作频率</td>
<td width="17%" align="center">f</td>
<td width="15%" align="center">kHz</td>
<td width="22%" align="center">0.1～100KHZ</td>
<td width="31%" align="center">0.1～100KHZ</td>
<td width="15%" align="center">0.1～100KHZ</td>
</tr>
<tr>
<td width="20%" align="center">功率</td>
<td width="17%" align="center">P</td>
<td width="15%" align="center">W</td>
<td width="22%" align="center">1.25W</td>
<td width="31%" align="center">1.25W</td>
<td width="15%" align="center">0.9W</td>
</tr>
<tr>
<td width="20%" align="center">工作温度</td>
<td width="17%" align="center">Ta</td>
<td width="15%" align="center">度</td>
<td width="22%" align="center">0～70度</td>
<td width="31%" align="center">0～70度</td>
<td width="15%" align="center">0～70度</td>
</tr>
</table>
<p><font color="#FF0000">在实际应用中的注意：</font></p>
<p>1：快速开关二极管可以选用IN4148，在要求高效率的场合必须使用IN5819！</p>
<p>2：34063能承受的电压，即输入输出电压绝对值之和不能超过40V，否则不能安全稳定的工作。 </p>
</BODY></HTML>
⌨️ 快捷键说明
复制代码
Ctrl + C
搜索代码
Ctrl + F
全屏模式
F11
切换主题
Ctrl + Shift + D
显示快捷键
?
增大字号
Ctrl + =
减小字号
Ctrl + -