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Re: [TCML] sg3525
Hi Dave,
Thanks for the info, that lab was exactly what I was looking for,
I can change the frequency using a pot with Rt. Feel free to forward
the PCB layout, thanks again.
Scott Bogard.
On 4/7/09, sparktron01@xxxxxxxxxxx <sparktron01@xxxxxxxxxxx> wrote:
> Scott
>
> Let me look around in my PC's at home, I believe I have example circuits
> I have either designed or designed/built that will help get you started.
>
> Here is an article showing college Power Electronics Class and using
> an predecessor IR2153D part for a series resonant half bridge converter
> that students built and tested in lab portion of class. Well, a SRHBC is
> a SSTC tesla coil driver, minus the primary and secondary coils. You can
> turn off (inhibit) operation of circuit by pulling Ct down to "com-local (-)
> rail"
> (notice test points on reference below, that allows stopping IC and
> converter
> output.
>
> They even given you the PCB layout ;^D Most of the parts values can be
> inferred from application and IR application notes...
>
> http://www.epeec.ethz.ch/pdf/broeck_epe2001.pdf
>
> I know I have the UCC3808 circuit at home on ExPCB, I'll convert to a
> pdf and forward to you off-line...
>
> Regards
> Dave Sharpe, TCBOR/HEAS
> Chesterfield, VA USA
>
>
> Breadboard and test, be sure to use a
> ----- Original Message -----
> From: "Scott Bogard" <sdbogard@xxxxxxxxx>
> To: "Tesla Coil Mailing List" <tesla@xxxxxxxxxx>
> Sent: Saturday, April 4, 2009 12:29:22 AM GMT -05:00 US/Canada Eastern
> Subject: Re: [TCML] sg3525
>
> Dave,
> That IRS2153 looks like it would do the trick nicely, and it says
> it is wired similarly to the 555, so I just need to find an example
> circuit so I can extrapolate the differances (because obviously it
> won't be exactly the same as there are two outputs for half bridge, so
> at least one pin is differant.) Thanks for pointing it out, it may
> make my life much simpler! I'll need to do a thorough web search when
> I get back to school and have real internet (as opposed to the 26k
> dial up I am using now to (hopefully) check my e-mail.) Thanks again.
>
> Scott Bogard.
>
> On 4/2/09, sparktron01@xxxxxxxxxxx <sparktron01@xxxxxxxxxxx> wrote:
>> Scott
>>
>> There are several alternatives.
>> 1. Use a International Rectifier IR2153D or IR21531D chip.
>> They are used in plasma globe drivers, are half bridge and with
>> level shift 600V drivers will do almost everything you need, in an 8 pin
>> chip.
>> They were originally designed for the CCFL driver market.
>>
>> http://www.irf.com/technical-info/appnotes/an-1085.pdf
>>
>> http://www.irf.com/technical-info/designtp/dt98-4.pdf
>>
>> Although I have not built it, this chip family could be easily used to
>> build
>> a
>> HB variable frequency power driver for isolated power sources, small
>> induction
>> heaters or SSTC (not DRSSTC's). Auxiliary part count would be very low as
>> well, compared to alternative circuits. The IRS21531D is the part you
>> would
>> want in a through hole DIP8 package. Digikey stocks them at less then
>> $3.00
>> US each.
>>
>> http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=IRS21531DPBF-ND
>>
>>
>> You would want to use the IRS part versus the original IR part, newer
>> part has bootstrap housekeeping circuitry integrated into die, and reduces
>>
>> the further external parts to get your circuit running.
>>
>> A TI/Unitrode UCC3808 is current mode push pull PWM IC that I have used,
>> driving a
>> toroidal transformer (and gate drive transformer) to produce +/- 15VDC PS
>> with up
>> 1kV AC/DC isolation for Toshiba TLP250 isolated IGBT/FET drivers. Chip is
>> very simple (had running with less then 6 passive parts other then chip,
>> at
>> 150kHz)
>> and chip has fairly good drive capability (500mA source, 1A peak sink
>> respectively),
>> so you can direct drive a gate drive transformer for isolated PS
>> effectively. Has typical
>> switch mode features (soft-start, current limiting etc.); I just ran my
>> circuits open loop
>> and let it rip, ran fine.
>>
>> http://focus.ti.com/lit/ds/symlink/ucc3808-1.pdf
>>
>> Digikey also stocks, at less then $3.00 also (must compete with IRS21531D
>> ;^D )
>>
>> http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=296-11484-5-ND
>>
>>
>> Regards
>> Dave Sharpe, TCBOR/HEAS
>> Chesterfield, VA USA
>>
>> ----- Original Message -----
>> From: "Scott Bogard" <sdbogard@xxxxxxxxx>
>> To: "Tesla Coil Mailing List" <tesla@xxxxxxxxxx>
>> Sent: Wednesday, April 1, 2009 6:16:29 PM GMT -05:00 US/Canada Eastern
>> Subject: [TCML] sg3525
>>
>> Greetings all,
>> I am looking into an IC driven flyback driver (as opposed to the
>> self resonant topology.) I am thinking about the sg3525, I didn't
>> want to go with the 555 because everybody uses it and I want to make a
>> half bridge or a pushpull (for better power throughput at frequencies
>> other than perfect resonance.) I found this IC and it looks very
>> promising, no need for a gate transformer or other such things; but I
>> have no idea how to hook it up for reasonable frequency ranges
>> 15-100kHz, or what to change to vary the duty cycle, most applications
>> I see for this chip use low frequency output for inverters and such.
>> I am told this chip can also be easily modulated to switch between
>> frequencies which would be cool for plasma stuff. I found a data
>> sheet but it isn't very clear, and I was hoping somebody out there had
>> experimented with one of these and could shed some light on how to
>> wire it. Thanks.
>>
>> Scott Bogard.
>> the data sheet
>> http://www.datasheetcatalog.org/datasheet2/3/06ldp1xcssiphfp0xiy53d1ce9py.pdf
>>
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