I did get it.
It's almost the same circuit I'm using, except...
  - No remote switch.
  - No coil spike diodes (okay for my test ckt).
  - No voltage divider (I'm using the adj version.
  - Transformer.


The big questionable is the transformer, so I'm
tending to guess that that may be the problem.
What did you use for this?

Thanks,
-Neil.





> -----Original Message-----
> From: pic microcontroller discussion list
> [mailto:PICLIST@MITVMA.MIT.EDU]On Behalf Of Tal
> Sent: Saturday, March 01, 2003 6:57 PM
> To: PICLIST@MITVMA.MIT.EDU
> Subject: Re: [EE]: DC-DC converter woes?
>
>
> Did u get the PDF i have sent u?
> is it help u?
>
> Tal
>
> -----Original Message-----
> From: pic microcontroller discussion list
> [mailto:PICLIST@MITVMA.MIT.EDU]On
> Behalf Of PicDude
> Sent: Sunday, March 02, 2003 1:53 AM
> To: PICLIST@MITVMA.MIT.EDU
> Subject: Re: [EE]: DC-DC converter woes?
>
>
> IIRC, only diff was a remote on/off capability, so sure --
> I'd appreciate any help you can offer.
>
> Thanks,
> -Neil.
>
>
>
>
> > -----Original Message-----
> > From: pic microcontroller discussion list
> > [mailto:PICLIST@MITVMA.MIT.EDU]On Behalf Of Tal
> > Sent: Saturday, March 01, 2003 5:22 PM
> > To: PICLIST@MITVMA.MIT.EDU
> > Subject: Re: [EE]: DC-DC converter woes?
> >
> >
> > I have used LM2587T12.
> > Is it help you? do u need any info?
> >
> > Tal
> >
> >
> > -----Original Message-----
> > From: pic microcontroller discussion list
> > [mailto:PICLIST@MITVMA.MIT.EDU]On
> > Behalf Of PicDude
> > Sent: Sunday, March 02, 2003 12:10 AM
> > To: PICLIST@MITVMA.MIT.EDU
> > Subject: [EE]: DC-DC converter woes?
> >
> >
> > Any of you folks used the LM2588 switcher (or similar) before?
> I've been
> > having probs w/this chip, so I whittled it down to a very small/simple
> > circuit now, but I still can't get it to work.  For this, I'm
> > using a fresh
> > LM2588 (from a different order), so I doubt that the chip is at fault.
> >
> > My circuit (see attached circuit, which was created with NS's
> SMS tool)...
> > ==========
> > - Input is a 9V battery, and I have a 50-ohm load at the output.
> > - Transformer is a FT50-43 toroid core wound with 9 turns of
> 18-gauge wire
> > for the primary and 2 turns of 20-gauge wire for the secondary.
> > Schottky is a 1N5822.
> > - For voltage divider R1,R2 I'm using a 1.8k and a 3K.
> >
> > My results...
> > ==========
> > - Vout is 0V.  Bad.
> > - At the Vin terminal on the chip I get 9.1V.  Good.
> > - At the SW terminal (DMM set to DC Volts), I get 9.1V, and on
> AC Volts I
> > get 0V.  Not good....?
> > - The chip warms up very, very mildly.  Enough to know it's
> getting power,
> > but nothing to worry about.  (The last circuit I built with one of these
> > overheated till to the point of burning my finger and then smoked.)  But
> > this seems good.
> >
> > I've tried switching the output winding polarity in case I
> > accidentally got
> > that wrong, but that did not help any.
> >
> > Unfortunately, no oscope with me here, so I really can't see what's
> > happening.  Anyone have thoughts on what may be wrong here?  The
> > only thing
> > I I'm unsure about is if 2 turns on the toroid is enough.  Only
> > other option
> > (that I have with me) is a T130-3 with 34 and 9 turns for pri/sec resp.
> >
> > Cheers,
> > -Neil.
> >
> >
> >
> >
> >
> >
> > --
> > http://www.piclist.com#nomail Going offline? Don't AutoReply us!
> > email listserv@mitvma.mit.edu with SET PICList DIGEST in the body
> >
> > --
> > http://www.piclist.com#nomail Going offline? Don't AutoReply us!
> > email listserv@mitvma.mit.edu with SET PICList DIGEST in the body
> > ---
> > [This E-mail scanned for viruses]
> >
> >
>
> --
> http://www.piclist.com#nomail Going offline? Don't AutoReply us!
> email listserv@mitvma.mit.edu with SET PICList DIGEST in the body
>
> --
> http://www.piclist.com#nomail Going offline? Don't AutoReply us!
> email listserv@mitvma.mit.edu with SET PICList DIGEST in the body
> ---
> [This E-mail scanned for viruses]
>
>

--
http://www.piclist.com#nomail Going offline? Don't AutoReply us!
email listserv@mitvma.mit.edu with SET PICList DIGEST in the body