Re: [TCML] sg3525

[Scott Bogard <sdbogard@xxxxxxxxx>]

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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