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I don't have a Mallory catalog but I have several other manufacturers. I
suspect - though could be wrong - from the large capacitance they are
intended for input reservoir application in off-line switchers. If that is
the case the ripple current rating can be quite substantial. Example - a
470 uF / 450V is typically rated at 1.8A for 120 Hz. As the switch mode
supply draws current at frequencies up to 100 kHz or more the pulse current
capability will be 20A or so. If you take a conservative estimate, scaled
from the 470uF quoted the 120 Hz ripple current will be about 6 times (the
470uF example) i.e. about 8A minimum.
On the other hand they could be bulk storage types for example dc welder
application, or photo-flash in which case they have very high discharge
current capability - but not necessarily high input current rating. In
other words they may NOT be suitable for reservoir applications in a
conventional power supply. If you can find sombody with a recent Mallory
catalog this will definitely sort out the query. Hope this is of some
help.
John ZS5JF
----------
> From: cd <bearl@ozemail.com.au>
> To: amps@contesting.com
> Subject: [AMPS] Ripple Current rating of Mallory Electrolytics
To: <amps@contesting.com>
> Date: Sunday, October 25, 1998 1:17 PM
>
>
> I picked up a batch of Mallory Electrolytics, They are
>
> 450 volts DC Surge 525 vdc and are 1500MFD
> they have a serial number of les21823-a
> 235 7451k i do not what
> this number is.
>
> I do not know how old these units are, or what there ripple current
rating
> is and and what temperature.
>
>
> Anybody Help
>
>
> Craig
>
>
>
>
>
> --
> FAQ on WWW: http://www.contesting.com/ampfaq.html
> Submissions: amps@contesting.com
> Administrative requests: amps-REQUEST@contesting.com
> Problems: owner-amps@contesting.com
> Search: http://www.contesting.com/km9p/search.htm
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<html><head></head><BODY bgcolor=3D"#FFFFFF"><p><font size=3D2 =
color=3D"#000000" face=3D"Arial">I don't have a Mallory catalog but I =
have several other manufacturers. I suspect - though could be =
wrong - from the large capacitance they are intended for input reservoir =
application in off-line switchers. If that is the case the ripple =
current rating can be quite substantial. Example - a 470 uF =
/ 450V is typically rated at 1.8A for 120 Hz. As the switch mode =
supply draws current at frequencies up to 100 kHz or more the pulse =
current capability will be 20A or so. If you take a conservative =
estimate, scaled from the 470uF quoted the 120 Hz ripple current will be =
about 6 times (the 470uF example) i.e. about 8A minimum.<br><br>On =
the other hand they could be bulk storage types for example dc welder =
application, or photo-flash in which case they have very high discharge =
current capability - but not necessarily high input current rating. =
In other words they may NOT be suitable for reservoir applications =
in a conventional power supply. If you can find sombody with a =
recent Mallory catalog this will definitely sort out the query. =
Hope this is of some =
help.<br><br>John	ZS5JF<br><br><br>----------<br>> From: cd =
<<font color=3D"#0000FF"><u>bearl@ozemail.com.au</u><font =
color=3D"#000000">><br>> To: <font =
color=3D"#0000FF"><u>amps@contesting.com</u><font =
color=3D"#000000"><br>> Subject: [AMPS] Ripple Current rating of =
To: <amps@contesting.com>
Mallory Electrolytics<br>> Date: Sunday, October 25, 1998 1:17 =
PM<br>> <br>> <br>> I picked up a batch of Mallory =
Electrolytics, They are<br>> <br>> 450 volts DC Surge 525 vdc and =
are 1500MFD<br>> they have a serial number of les21823-a<br>> =
&=
nbsp; &n=
bsp; &nb=
sp; &nbs=
p;235 7451k i do not what<br>> this number is.<br>> <br>> I do =
not know how old these units are, or what there ripple current =
rating<br>> is and and what temperature.<br>> <br>> <br>> =
Anybody Help<br>> <br>> <br>> Craig<br>> <br>> <br>> =
<br>> <br>> <br>> --<br>> FAQ on WWW: =
&=
nbsp; <font =
color=3D"#0000FF"><u>http://www.contesting.com/ampfaq.html</u><font =
color=3D"#000000"><br>> Submissions: =
&=
nbsp;<font color=3D"#0000FF"><u>amps@contesting.com</u><font =
color=3D"#000000"><br>> Administrative requests: <font =
color=3D"#0000FF"><u>amps-REQUEST@contesting.com</u><font =
color=3D"#000000"><br>> Problems: =
&=
nbsp; <font =
color=3D"#0000FF"><u>owner-amps@contesting.com</u><font =
color=3D"#000000"><br>> Search: =
&=
nbsp; <font =
color=3D"#0000FF"><u>http://www.contesting.com/km9p/search.htm</u><font =
color=3D"#000000"></p>
</font></font></font></font></font></font></font></font></font></font></f=
ont></font></font></font></font></body></html>
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FAQ on WWW: http://www.contesting.com/ampfaq.html
Submissions: amps@contesting.com
Administrative requests: amps-REQUEST@contesting.com
Problems: owner-amps@contesting.com
Search: http://www.contesting.com/km9p/search.htm
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