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<div class="moz-cite-prefix">Pajkou s hrotem ani nahodou, jedine do
pasty a prejet vzduchem nebo infra. Jak uz zaznelo, hotair stanice
jsou celkem levne, ja kupoval Polskou na Aukru a funguje skvele,
teplotu drzi na stupen a docela sedi podle nastaveni na displeji.
Cili nastavim 240-250 stupnu podle masivnosti pajeneho objektu,
vyberu trysku, a vetsinou i bez predehrevu je hotovo za cca 30s.
Pajim takhle uz vsechny mensi SMD soucastky, je to pohodlnejsi a
rychlejsi nez kazde smeti letovat pajkou na 2x... Pastu mam z ciny
uz 3. rok v lednici, trosku dam do strikacky a to se pak vali rok
v dilne na stole a funguje stale. Jen ty pasty z TME ve
strikackach jsou naprosto nepouzitelne, to me ze zacatku
odrazovalo nez jsem koupil tu z CN...<br>
Dne 24. 7. 2014 7:42, Kručinský Ladislav napsal(a):<br>
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<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>
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<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>
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<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 [<a class="moz-txt-link-freetext" href="mailto:hw-list-bounces@list.hw.cz">mailto:hw-list-bounces@list.hw.cz</a>]
<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>
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<p class="MsoNormal" style="margin-left:35.4pt"><o:p> </o:p></p>
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<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>
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<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
moz-do-not-send="true"
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 moz-do-not-send="true"
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>
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<p class="MsoNormal" style="margin-left:35.4pt">spinaci f
1MHz, cili to cle vyjde male.<o:p></o:p></p>
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<p class="MsoNormal" style="margin-left:35.4pt"><o:p> </o:p></p>
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<p class="MsoNormal" style="margin-left:35.4pt">2014-07-13
12:24 GMT+00:00 Jaroslav Buchta <<a
moz-do-not-send="true"
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>
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<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 moz-do-not-send="true"
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>
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