<html xmlns:v="urn:schemas-microsoft-com:vml" xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:w="urn:schemas-microsoft-com:office:word" xmlns:m="http://schemas.microsoft.com/office/2004/12/omml" xmlns="http://www.w3.org/TR/REC-html40">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-2">
<meta name="Generator" content="Microsoft Word 14 (filtered medium)">
<style><!--
/* Font Definitions */
@font-face
{font-family:Calibri;
panose-1:2 15 5 2 2 2 4 3 2 4;}
@font-face
{font-family:Tahoma;
panose-1:2 11 6 4 3 5 4 4 2 4;}
@font-face
{font-family:Consolas;
panose-1:2 11 6 9 2 2 4 3 2 4;}
/* Style Definitions */
p.MsoNormal, li.MsoNormal, div.MsoNormal
{margin:0cm;
margin-bottom:.0001pt;
font-size:12.0pt;
font-family:"Times New Roman","serif";
color:black;}
a:link, span.MsoHyperlink
{mso-style-priority:99;
color:blue;
text-decoration:underline;}
a:visited, span.MsoHyperlinkFollowed
{mso-style-priority:99;
color:purple;
text-decoration:underline;}
pre
{mso-style-priority:99;
mso-style-link:"Formátovaný v HTML Char";
margin:0cm;
margin-bottom:.0001pt;
font-size:10.0pt;
font-family:"Courier New";
color:black;}
span.FormtovanvHTMLChar
{mso-style-name:"Formátovaný v HTML Char";
mso-style-priority:99;
mso-style-link:"Formátovaný v HTML";
font-family:Consolas;
color:black;}
span.StylE-mailovZprvy19
{mso-style-type:personal-reply;
font-family:"Calibri","sans-serif";
color:#1F497D;}
.MsoChpDefault
{mso-style-type:export-only;
font-size:10.0pt;}
@page WordSection1
{size:612.0pt 792.0pt;
margin:70.85pt 70.85pt 70.85pt 70.85pt;}
div.WordSection1
{page:WordSection1;}
--></style><!--[if gte mso 9]><xml>
<o:shapedefaults v:ext="edit" spidmax="1026" />
</xml><![endif]--><!--[if gte mso 9]><xml>
<o:shapelayout v:ext="edit">
<o:idmap v:ext="edit" data="1" />
</o:shapelayout></xml><![endif]-->
</head>
<body bgcolor="white" lang="CS" link="blue" vlink="purple">
<div class="WordSection1">
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">To je šikovný obvod ale dá se v amatérských podmínkách vůbec připájet? Myslím tím bez horkého vzduchu nebo trouby – klasickou páječkou s hrotem?<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<div>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Zdravím<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">L. Kručinský<o:p></o:p></span></p>
</div>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<div>
<div style="border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm 0cm 0cm">
<p class="MsoNormal" style="margin-left:35.4pt"><b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif";color:windowtext">From:</span></b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif";color:windowtext"> Hw-list [mailto:hw-list-bounces@list.hw.cz]
<b>On Behalf Of </b>Jaroslav Buchta<br>
<b>Sent:</b> Wednesday, July 23, 2014 5:53 PM<br>
<b>To:</b> HW-news<br>
<b>Subject:</b> Re: A8498 thermal pad<o:p></o:p></span></p>
</div>
</div>
<p class="MsoNormal" style="margin-left:35.4pt"><o:p> </o:p></p>
<div>
<p class="MsoNormal" style="margin-left:35.4pt">Dekuji za tip, funguje skvele, z 15V bere cca 2-3mA pri odberu na 4,5V kolem 8-10mA Jen to pouzdro 10+1 vyvodu 2x3mm naletovat na jednostrannou DPS bez masky bylo o nervy, ale sedlo na prvni pokus ;-)<br>
Co je horsi, je izolacni menic 5->15V, zkousel jsem ruzne takove ty kostky 1-2W a ma to hroznou vlastni spotrebu, kolem 50mA skoro naprazdno, pri zatizeni cca 25mA to bere asi 110-120mA z 5V.... Ma nekdo tip na lepsi reseni? Klidne nejaky IC a nejake hotove
trafko, oddeleni nemusi byt na tisice V, jen pracovni oddeleni AD prevodniku a napajeni cidel. Bude to na desce 8x, na cene zalezi. Proudovy odber na 15V bude kolem 30-40mA<br>
<br>
<br>
Dne 13. 7. 2014 14:48, Draček Fráček napsal(a):<o:p></o:p></p>
</div>
<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">
<div>
<div>
<p class="MsoNormal" style="margin-left:35.4pt">Ucinnost tohoto IC pri 30mA bude nekde kolem 50%.<br>
S timto se dostanete na 80% , cenove <a href="http://cz.farnell.com/texas-instruments/tps62175dqct/buck-4-75-28v-0-5a-1v-6v-10wson/dp/2255013">
http://cz.farnell.com/texas-instruments/tps62175dqct/buck-4-75-28v-0-5a-1v-6v-10wson/dp/2255013</a><br>
<a href="http://www.ti.com/lit/ds/symlink/tps62175.pdf">http://www.ti.com/lit/ds/symlink/tps62175.pdf</a><o:p></o:p></p>
</div>
<div>
<p class="MsoNormal" style="margin-left:35.4pt">spinaci f 1MHz, cili to cle vyjde male.<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal" style="margin-left:35.4pt"><o:p> </o:p></p>
</div>
</div>
<div>
<p class="MsoNormal" style="mso-margin-top-alt:0cm;margin-right:0cm;margin-bottom:12.0pt;margin-left:35.4pt">
<o:p> </o:p></p>
<div>
<p class="MsoNormal" style="margin-left:35.4pt">2014-07-13 12:24 GMT+00:00 Jaroslav Buchta <<a href="mailto:jaroslav.buchta@hascomp.cz" target="_blank">jaroslav.buchta@hascomp.cz</a>>:<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:35.4pt">O chlazeni mi nejak nejde, odber bude asi 10-30mA z 5V (spis jsem zvedavej, jestli se mi to na tenhle proud podari vyladit...) Libi se mi na tomhle obvodu, ze je levny a ma napajeni z vystupni strany, cili by
mohl mit maly odber z 24V napajeciho napeti (to je z DC/DC menice)<br>
Je to ve fazi overeni prototypu, tak jestli ma nekdo osvedceny lepsi obvod pro tyto ucely, sem s nim.<br>
<br>
Dne 13. 7. 2014 12:16, Peter Janiš napsal(a): <o:p></o:p></p>
<div>
<div>
<blockquote style="border:none;border-left:solid #CCCCCC 1.0pt;padding:0cm 0cm 0cm 6.0pt;margin-left:4.8pt;margin-right:0cm">
<p class="MsoNormal" style="margin-left:35.4pt"><o:p> </o:p></p>
<p class="MsoNormal" style="margin-left:35.4pt">Pokiaľ nie je v datasheete (alebo v aplikačných poznámkach) uvedené, kam sa má thermal pad pripojiť, tak ho nepripájajte nikam.<br>
Pod thermal padom sa zvyčajne nasekajú thermal pads (prekovy) a na druhej strane PCB sa rozleje maximálna možná plocha na distribúciu tepelných strát (ono je to trošku zložitejšie). Cez TIM sa PCB môže ešte pritlačiť k chladiču (ktorý býva zvyčajne časťou konštrukcie).
No a pokiaľ potrebujete spĺňať elektrickú pevnosť..........<br>
<br>
p.j.<br>
<br>
<br>
On 07/12/2014 03:23 PM, Jaroslav Buchta wrote:<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:35.4pt">Step down menic <a href="http://cz.farnell.com/jsp/search/browse.jsp;jsessionid=VRNJW31NLZRVGCQLCIQZLTQ?N=0&Ntk=gensearch&Ntt=A8498&Ntx=mode+matchallpartial&exposeLevel2Refinement=true&suggestions=false&ref=globalsearch&_requestid=110077" target="_blank">
http://cz.farnell.com/jsp/search/browse.jsp;jsessionid=VRNJW31NLZRVGCQLCIQZLTQ?N=0&Ntk=gensearch&Ntt=A8498&Ntx=mode+matchallpartial&exposeLevel2Refinement=true&suggestions=false&ref=globalsearch&_requestid=110077</a><br>
Kam (jestli) pripojit thermal pad? Nejak to v DS nemuzu najit.<br>
<br>
---<br>
This email is free from viruses and malware because avast! Antivirus protection is active.<br>
<a href="http://www.avast.com" target="_blank">http://www.avast.com</a><br>
<br>
_______________________________________________<br>
HW-list mailing list - sponsored by <a href="http://www.HW.cz" target="_blank">
www.HW.cz</a><br>
<a href="mailto:Hw-list@list.hw.cz" target="_blank">Hw-list@list.hw.cz</a><br>
<a href="http://list.hw.cz/mailman/listinfo/hw-list" target="_blank">http://list.hw.cz/mailman/listinfo/hw-list</a><o:p></o:p></p>
<p class="MsoNormal" style="margin-left:35.4pt"><br>
_______________________________________________<br>
HW-list mailing list - sponsored by <a href="http://www.HW.cz" target="_blank">
www.HW.cz</a><br>
<a href="mailto:Hw-list@list.hw.cz" target="_blank">Hw-list@list.hw.cz</a><br>
<a href="http://list.hw.cz/mailman/listinfo/hw-list" target="_blank">http://list.hw.cz/mailman/listinfo/hw-list</a><o:p></o:p></p>
</blockquote>
<p class="MsoNormal" style="margin-left:35.4pt"><br>
<br>
---<br>
This email is free from viruses and malware because avast! Antivirus protection is active.<br>
<a href="http://www.avast.com" target="_blank">http://www.avast.com</a><br>
<br>
_______________________________________________<br>
HW-list mailing list - sponsored by <a href="http://www.HW.cz" target="_blank">
www.HW.cz</a><br>
<a href="mailto:Hw-list@list.hw.cz" target="_blank">Hw-list@list.hw.cz</a><br>
<a href="http://list.hw.cz/mailman/listinfo/hw-list" target="_blank">http://list.hw.cz/mailman/listinfo/hw-list</a><o:p></o:p></p>
</div>
</div>
</div>
<p class="MsoNormal" style="margin-left:35.4pt"><o:p> </o:p></p>
</div>
<p class="MsoNormal" style="margin-left:35.4pt"><br>
<br>
<br>
<o:p></o:p></p>
<pre style="margin-left:35.4pt">_______________________________________________<o:p></o:p></pre>
<pre style="margin-left:35.4pt">HW-list mailing list - sponsored by <a href="http://www.HW.cz">www.HW.cz</a><o:p></o:p></pre>
<pre style="margin-left:35.4pt"><a href="mailto:Hw-list@list.hw.cz">Hw-list@list.hw.cz</a><o:p></o:p></pre>
<pre style="margin-left:35.4pt"><a href="http://list.hw.cz/mailman/listinfo/hw-list">http://list.hw.cz/mailman/listinfo/hw-list</a><o:p></o:p></pre>
</blockquote>
<p class="MsoNormal" style="margin-left:35.4pt"><o:p> </o:p></p>
</div>
</body>
</html>