Muricio

How great !
I did not dawn on me that there might be an IC that was rated for   
more than 1000V.
I will check it out.
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&productID=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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