What will you be driving? At what frequency?

Regards,

> -----Original Message-----
> From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] On
> Behalf Of NOPE9
> Sent: Tuesday, September 08, 2009 17:35
> To: Microcontroller discussion list - Public.
> Subject: Re: [EE]: designing a high side driver 1000V
> 
> The only issue I see is that it may be too slow.
> but maybe not.
> Gus
> 
> > On Sep 8, 2009, at 12:32 PM, Mauricio Jancic wrote:
> >
> > May I recommend using a half bridge driver from IR: IR22141
> >
> >
> https://ec.irf.com/v6/en/US/adirect/ir?cmd=catProductDetailFrame&produc
> tID=I
> > R22141SSPBF
> >
> > This is actually a 1200V IC, so it might not be ok for you since your
> > MOSFETs are 1500V, but on the subject you said 1000V, so....
> >
> > It has over current shutdown, under voltage protection and 2A source
> > 3A sink
> > current capability.
> >
> > Regards,
> > Mauricio Jancic
> >
> >
> >
> >> -----Original Message-----
> >> From: piclist-bounces@MIT.EDU [mailto:piclist-bounces@MIT.EDU] On
> >> Behalf Of NOPE9
> >> Sent: Tuesday, September 08, 2009 15:18
> >> To: Microcontroller discussion list - Public.
> >> Subject: [EE]: designing a high side driver 1000V
> >>
> >> I am designing a high side driver to go with a low side driver to
> >> form
> >> 1/2 of an H-bridge.
> >> I am using 1500V MOSFETs ( STW4N150 )
> >> http://www.st.com/stonline/products/literature/ds/11262/stp4n150.htm
> >> The spec says the turn on and turn off time for this MOSFET is about
> >> 50 nsecs.
> >>
> >> I have considered using an opto-isolator part.  Are there any that
> >> have a speed around 50 nsec ?
> >> Or are there any other isolation techniques that would work ?
> >>
> >>
> >> I have included two schematics that show an approach I am
> >> considering.
> >> http://oh-god.com:5080/dir/1500V-driver/
> >>
> >> the first schematic shows a totem pole consisting of two MOSFETS
> with
> >> drivers.
> >> HSD ==> High Side Driver
> >> LSD ==>  hallucinations , I mean Low Side Driver
> >>
> >>
> >> The second diagram is a High Side Driver.  Isolated 12V is supplied
> >> to
> >> drive the MOSFET.  R1 is 50K.
> >> Reflected through Q1 ( 2N3906 PNP )  ( I forgot the arrow on the R1
> >> side of Q1 )  , the base of Q1 will see
> >> 5M ohm.  R2 is 5M ohm.   The Q2 MOSFET is a 1500V device.  D2 would
> >> be
> >> a 1N4148 and D1 is a 15V zener.
> >> D1 is there to guarantee that none of the parts sees more than 15V.
> >> ( Other than Q2 or R1 and R2 )
> >> Power dissipation through R1 and R2 should be less than .25 watt.
> >>
> >> Turning on Q2 should turn Q1 off.
> >>
> >> A 2N3906 is rated at 100 MHz.   A 1N4148 is much faster than a zener
> >> diode ( I think ).
> >>
> >> Will this circuit blow up and put out my eye ?
> >>
> >> images are hand-drawn schematics captured by PhotoBooth running on a
> >> MacBook.
> >>
> >> Gus
> >>
> >
> --
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