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📄 懂开关电源的帮忙看一下，以下的1n5819肖特基二极管能否用普通二极管代替？ ---“我们的avr”技术论坛(主坛).htm

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    vAlign=top width="81%" bgColor=#d1d9e2><FONT 
      color=#000000>Datasheet上列出了可用的二极管： <BR><BR><A 
      href="懂开关电源的帮忙看一下，以下的1N5819肖特基二极管能否用普通二极管代替？ ---“我们的AVR”技术论坛(主坛).files/armok017422.JPG" 
      target=_blank><IMG 
      src="懂开关电源的帮忙看一下，以下的1N5819肖特基二极管能否用普通二极管代替？ ---“我们的AVR”技术论坛(主坛).files/armok017422.JPG" 
      border=0></A> <BR></FONT></TD></TR>
  <TR>
    <TD class=f03 
    style="BORDER-RIGHT: #bbbbbb 0.5pt solid; BORDER-TOP: medium none; BORDER-LEFT: medium none; BORDER-BOTTOM: #ffffff 0.5pt solid" 
    vAlign=bottom bgColor=#d1d9e2>　 </TD></TR>
  <TR>
    <TD class=f03 
    style="BORDER-RIGHT: #ffffff 0.5pt solid; BORDER-TOP: medium none; BORDER-LEFT: #bbbbbb 0.5pt solid; BORDER-BOTTOM: #bbbbbb 0.5pt solid" 
    align=left width="19%" bgColor=#d1d9e2><IMG height=1 src="" 
      width=7>2004-11-17,15:56:29 </TD>
    <TD class=f03 
    style="BORDER-RIGHT: #bbbbbb 0.5pt solid; BORDER-TOP: medium none; BORDER-LEFT: medium none; BORDER-BOTTOM: #bbbbbb 0.5pt solid" 
    vAlign=top width="81%" bgColor=#d1d9e2 ?>
      <TABLE width="100%">
        <TBODY>
        <TR>
          <TD align=left><IMG height=1 src="" width=7> <A class=tt4 
            href="http://www.ouravr.com/bbs/user_information.jsp?user_name=qwernet" 
            target=_blank>资料</A> <IMG height=1 src="" width=7> <A class=tt4 
            href="mailto:リジゲグザケス@msn.com(为防垃圾邮件,将用户名unicode减去0x3080可得真实用户名)">邮件</A> 
            <IMG height=1 src="" width=7> </TD>
          <TD align=right><IMG height=1 src="" width=2> <IMG height=1 src="" 
            width=2> <IMG height=1 src="" width=2> <IMG height=1 src="" width=2> 
            <IMG height=1 src="" width=2> <IMG height=1 src="" width=2> <SPAN 
            class=f01>编辑</SPAN> <IMG height=1 src="" width=7> <SPAN 
            class=f01>删除</SPAN> <IMG height=1 src="" width=7> <IMG height=1 
            src="" width=7> </TD></TR></TBODY></TABLE></TD></TR></TBODY></TABLE>
<TABLE style="TABLE-LAYOUT: fixed; WORD-BREAK: break-all" cellSpacing=0 
cellPadding=6 width="100%" border=0>
  <TBODY>
  <TR>
    <TD class=f03 
    style="BORDER-RIGHT: #bbbbbb 0.5pt solid; BORDER-TOP: medium none; BORDER-LEFT: #bbbbbb 0.5pt solid; BORDER-BOTTOM: #bbbbbb 0.5pt solid" 
    vAlign=top align=left width="19%" bgColor=#e8e8e8 rowSpan=2>【3楼】 <FONT 
      color=#000000>fjfzcwq </FONT><BR>积分：<FONT 
      color=#000000>40</FONT><BR>派别：<FONT color=#000000></FONT><BR>等级：<FONT 
      color=#000000>------</FONT><BR>来自：<FONT color=#000000></FONT><BR></TD>
    <TD class=f03 
    style="BORDER-RIGHT: #bbbbbb 0.5pt solid; BORDER-TOP: medium none; BORDER-LEFT: medium none; BORDER-BOTTOM: medium none" 
    vAlign=top width="81%" bgColor=#e8e8e8><FONT 
      color=#000000>高频、低压、大电流特性是肖特基二极管与普通二极管的不同点，它广泛被应用于开关电源、变频器、驱动器等电路，作高频、低压、大电流整流，续流、保护二极管使用。 
      <BR>除以上外,其正向压绛较小,故发热也小.如果LM2575内部振荡频率为52K我觉得用IN4148不合适,没有5819可以从坏彩电,显示器的电源或行输出中拆 
      <BR></FONT></TD></TR>
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    <TD class=f03 
    style="BORDER-RIGHT: #bbbbbb 0.5pt solid; BORDER-TOP: medium none; BORDER-LEFT: medium none; BORDER-BOTTOM: #bbbbbb 0.5pt solid" 
    vAlign=bottom bgColor=#e8e8e8>　 </TD></TR>
  <TR>
    <TD class=f03 
    style="BORDER-RIGHT: #bbbbbb 0.5pt solid; BORDER-TOP: medium none; BORDER-LEFT: #bbbbbb 0.5pt solid; BORDER-BOTTOM: #bbbbbb 0.5pt solid" 
    align=left width="19%" bgColor=#e8e8e8><IMG height=1 src="" 
      width=7>2004-11-17,16:09:56 </TD>
    <TD class=f03 
    style="BORDER-RIGHT: #bbbbbb 0.5pt solid; BORDER-TOP: medium none; BORDER-LEFT: medium none; BORDER-BOTTOM: #bbbbbb 0.5pt solid" 
    vAlign=top width="81%" bgColor=#e8e8e8 ?>
      <TABLE width="100%">
        <TBODY>
        <TR>
          <TD align=left><IMG height=1 src="" width=7> <A class=tt4 
            href="http://www.ouravr.com/bbs/user_information.jsp?user_name=fjfzcwq" 
            target=_blank>资料</A> <IMG height=1 src="" width=7> <SPAN 
            class=f01>邮件</SPAN> <IMG height=1 src="" width=7> </TD>
          <TD align=right><IMG height=1 src="" width=2> <IMG height=1 src="" 
            width=2> <IMG height=1 src="" width=2> <IMG height=1 src="" width=2> 
            <IMG height=1 src="" width=2> <IMG height=1 src="" width=2> <SPAN 
            class=f01>编辑</SPAN> <IMG height=1 src="" width=7> <SPAN 
            class=f01>删除</SPAN> <IMG height=1 src="" width=7> <IMG height=1 
            src="" width=7> </TD></TR></TBODY></TABLE></TD></TR></TBODY></TABLE>
<TABLE style="TABLE-LAYOUT: fixed; WORD-BREAK: break-all" cellSpacing=0 
cellPadding=6 width="100%" border=0>
  <TBODY>
  <TR>
    <TD class=f03 
    style="BORDER-RIGHT: #ffffff 0.5pt solid; BORDER-TOP: #ffffff 0.5pt solid; BORDER-LEFT: #bbbbbb 0.5pt solid; BORDER-BOTTOM: #ffffff 0.5pt solid" 
    vAlign=top align=left width="19%" bgColor=#d1d9e2 rowSpan=2>【4楼】 <FONT 
      color=#000000>qwernet 小俊</FONT><BR>积分：<FONT 
      color=#000000>1222</FONT><BR>派别：<FONT color=#000000></FONT><BR>等级：<FONT 
      color=#000000>------</FONT><BR>来自：<FONT color=#000000>广州市东山区</FONT><BR></TD>
    <TD class=f03 
    style="BORDER-RIGHT: #bbbbbb 0.5pt solid; BORDER-TOP: #ffffff 0.5pt solid; BORDER-LEFT: medium none; BORDER-BOTTOM: medium none" 
    vAlign=top width="81%" bgColor=#d1d9e2><FONT 
      color=#000000>IN5818、IN5819是最常用的肖特基二极管，应该很容易买到吧。</FONT> </TD></TR>
  <TR>
    <TD class=f03 
    style="BORDER-RIGHT: #bbbbbb 0.5pt solid; BORDER-TOP: medium none; BORDER-LEFT: medium none; BORDER-BOTTOM: #ffffff 0.5pt solid" 
    vAlign=bottom bgColor=#d1d9e2>　 </TD></TR>
  <TR>
    <TD class=f03 
    style="BORDER-RIGHT: #ffffff 0.5pt solid; BORDER-TOP: medium none; BORDER-LEFT: #bbbbbb 0.5pt solid; BORDER-BOTTOM: #bbbbbb 0.5pt solid" 
    align=left width="19%" bgColor=#d1d9e2><IMG height=1 src="" 
      width=7>2004-11-17,16:16:30 </TD>
    <TD class=f03 
    style="BORDER-RIGHT: #bbbbbb 0.5pt solid; BORDER-TOP: medium none; BORDER-LEFT: medium none; BORDER-BOTTOM: #bbbbbb 0.5pt solid" 
    vAlign=top width="81%" bgColor=#d1d9e2 ?>
      <TABLE width="100%">
        <TBODY>
        <TR>
          <TD align=left><IMG height=1 src="" width=7> <A class=tt4 
            href="http://www.ouravr.com/bbs/user_information.jsp?user_name=qwernet" 
            target=_blank>资料</A> <IMG height=1 src="" width=7> <A class=tt4 
            href="mailto:リジゲグザケス@msn.com(为防垃圾邮件,将用户名unicode减去0x3080可得真实用户名)">邮件</A> 
            <IMG height=1 src="" width=7> </TD>
          <TD align=right><IMG height=1 src="" width=2> <IMG height=1 src="" 
            width=2> <IMG height=1 src="" width=2> <IMG height=1 src="" width=2> 
            <IMG height=1 src="" width=2> <IMG height=1 src="" width=2> <SPAN 
            class=f01>编辑</SPAN> <IMG height=1 src="" width=7> <SPAN 
            class=f01>删除</SPAN> <IMG height=1 src="" width=7> <IMG height=1 
            src="" width=7> </TD></TR></TBODY></TABLE></TD></TR></TBODY></TABLE>
<TABLE style="TABLE-LAYOUT: fixed; WORD-BREAK: break-all" cellSpacing=0 
cellPadding=6 width="100%" border=0>
  <TBODY>
  <TR>
    <TD class=f03 
    style="BORDER-RIGHT: #bbbbbb 0.5pt solid; BORDER-TOP: medium none; BORDER-LEFT: #bbbbbb 0.5pt solid; BORDER-BOTTOM: #bbbbbb 0.5pt solid" 
    vAlign=top align=left width="19%" bgColor=#e8e8e8 rowSpan=2>【5楼】 <FONT 
      color=#000000>jsjh </FONT><BR>积分：<FONT 
      color=#000000>179</FONT><BR>派别：<FONT color=#000000></FONT><BR>等级：<FONT 
      color=#000000>------</FONT><BR>来自：<FONT color=#000000></FONT><BR></TD>
    <TD class=f03 
    style="BORDER-RIGHT: #bbbbbb 0.5pt solid; BORDER-TOP: medium none; BORDER-LEFT: medium none; BORDER-BOTTOM: medium none" 
    vAlign=top width="81%" bgColor=#e8e8e8><FONT 
      color=#000000>该二极管的选择原则:必须选快恢复二极管.二极管的额定电流应大于最大负载电流的1.2倍,考虑负载短路的情况,二极管的额定电流应大于LM2575的最大电流限制.二极管的反向电压应大于最大输入电压的1.25倍.</FONT> 
    </TD></TR>
  <TR>
    <TD class=f03 
    style="BORDER-RIGHT: #bbbbbb 0.5pt solid; BORDER-TOP: medium none; BORDER-LEFT: medium none; BORDER-BOTTOM: #bbbbbb 0.5pt solid" 
    vAlign=bottom bgColor=#e8e8e8>　 </TD></TR>
  <TR>
    <TD class=f03 
    style="BORDER-RIGHT: #bbbbbb 0.5pt solid; BORDER-TOP: medium none; BORDER-LEFT: #bbbbbb 0.5pt solid; BORDER-BOTTOM: #bbbbbb 0.5pt solid" 
    align=left width="19%" bgColor=#e8e8e8><IMG height=1 src="" 
      width=7>2004-11-17,16:38:00 </TD>
    <TD class=f03 
    style="BORDER-RIGHT: #bbbbbb 0.5pt solid; BORDER-TOP: medium none; BORDER-LEFT: medium none; BORDER-BOTTOM: #bbbbbb 0.5pt solid" 
    vAlign=top width="81%" bgColor=#e8e8e8 ?>
      <TABLE width="100%">
        <TBODY>
        <TR>
          <TD align=left><IMG height=1 src="" width=7> <A class=tt4 
            href="http://www.ouravr.com/bbs/user_information.jsp?user_name=jsjh" 
            target=_blank>资料</A> <IMG height=1 src="" width=7> <SPAN 
            class=f01>邮件</SPAN> <IMG height=1 src="" width=7> </TD>
          <TD align=right><IMG height=1 src="" width=2> <IMG height=1 src="" 
            width=2> <IMG height=1 src="" width=2> <IMG height=1 src="" width=2> 
            <IMG height=1 src="" width=2> <IMG height=1 src="" width=2> <SPAN 
            class=f01>编辑</SPAN> <IMG height=1 src="" width=7> <SPAN 
            class=f01>删除</SPAN> <IMG height=1 src="" width=7> <IMG height=1 
            src="" width=7> </TD></TR></TBODY></TABLE></TD></TR></TBODY></TABLE>
<TABLE style="TABLE-LAYOUT: fixed; WORD-BREAK: break-all" cellSpacing=0 
cellPadding=6 width="100%" border=0>
  <TBODY>
  <TR>
    <TD class=f03 
    style="BORDER-RIGHT: #ffffff 0.5pt solid; BORDER-TOP: #ffffff 0.5pt solid; BORDER-LEFT: #bbbbbb 0.5pt solid; BORDER-BOTTOM: #ffffff 0.5pt solid" 
    vAlign=top align=left width="19%" bgColor=#d1d9e2 rowSpan=2>【6楼】 <FONT 
      color=#000000>527dz </FONT><BR>积分：<FONT 
      color=#000000>706</FONT><BR>派别：<FONT color=#000000></FONT><BR>等级：<FONT 
      color=#000000>------</FONT><BR>来自：<FONT color=#000000>昆明</FONT><BR></TD>
    <TD class=f03 
    style="BORDER-RIGHT: #bbbbbb 0.5pt solid; BORDER-TOP: #ffffff 0.5pt solid; BORDER-LEFT: medium none; BORDER-BOTTOM: medium none" 
    vAlign=top width="81%" bgColor=#d1d9e2><FONT 
      color=#000000>找不到的话，使用快速恢复二极管也可以的。IN4148肯定是不行的。</FONT> </TD></TR>
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    <TD class=f03 
    style="BORDER-RIGHT: #bbbbbb 0.5pt solid; BORDER-TOP: medium none; BORDER-LEFT: medium none; BORDER-BOTTOM: #ffffff 0.5pt solid" 
    vAlign=bottom 
      bgColor=#d1d9e2>__________________________<BR>www.527dz.com欢迎大家光临 </TD></TR>
  <TR>
    <TD class=f03 
    style="BORDER-RIGHT: #ffffff 0.5pt solid; BORDER-TOP: medium none; BORDER-LEFT: #bbbbbb 0.5pt solid; BORDER-BOTTOM: #bbbbbb 0.5pt solid" 
    align=left width="19%" bgColor=#d1d9e2><IMG height=1 src="" 
      width=7>2004-11-17,17:09:00 </TD>
    <TD class=f03 
    style="BORDER-RIGHT: #bbbbbb 0.5pt solid; BORDER-TOP: medium none; BORDER-LEFT: medium none; BORDER-BOTTOM: #bbbbbb 0.5pt solid" 
    vAlign=top width="81%" bgColor=#d1d9e2 ?>
      <TABLE width="100%">
        <TBODY>
        <TR>
          <TD align=left><IMG height=1 src="" width=7> <A class=tt4 
            href="http://www.ouravr.com/bbs/user_information.jsp?user_name=527dz" 
            target=_blank>资料</A> <IMG height=1 src="" width=7> <A class=tt4 
            href="mailto:ztexiaopeng@vip.sina.com">邮件</A> <IMG height=1 src="" 
            width=7> </TD>
          <TD align=right><IMG height=1 src="" width=2> <IMG height=1 src="" 
            width=2> <IMG height=1 src="" width=2> <IMG height=1 src="" width=2> 
            <IMG height=1 src="" width=2> <IMG height=1 src="" width=2> <SPAN 
            class=f01>编辑</SPAN> <IMG height=1 src="" width=7> <SPAN
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