i need help i need to do pulsing power supply vo=40kvd and io=10 ma and the pulsing rate for about 1 khz so is there any mofset or igbt can i use it to do pulsing

 

What is this circuit for? Do you need a constant current of 10mA during 500us (1kHz @50%) ???

You will have some difficulties finding a component for this voltage.

Do you already have a power supply that can output this voltage?

 

I believe there is no such thing as a 40KV semiconductor. My guess would be a very expensive vacuum tube because mechanical switches can't go that fast.

 

40kv @ 10mA is 400 Watts. Are you sure about that requirement?

You will likely need to use a transformer, like an automotive ignition coil, to create such pulses at that high of a voltage. There are plenty of relatively low-voltage switches/transistors/MOSFETs/IGBT's that are suitable for the primary side of the coil.

Here are some OnSemi part numbers for their ignition IBGTs:
NGD15N41A: Ignition IGBT, 15 A, 410 V
MGP15N40CL: N-channel Ignition IGBT, 15 A, 410 V
NGD18N40A: Ignition IGBT, N-Channel, 18 A, 400 V
NGB8204N: N-Channel Ignition IGBT 18 A, 400 V
NGB8202N: N-Channel Ignition IGBT 20 A, 400 V
NGB8207AN: N-Channel Ignition IGBT 20 A, 365 V

 

Are you in sneaky mode, wookie?

 

Are you in sneaky mode, wookie?

Always. Otherwise, I get an unmanageable number of PM's and E-mails.

 

Awww. You're just too lovable!

 

What is the duty cycle. That answer makes all the difference in the world between peak power and average power.

 

What is this circuit for? Do you need a constant current of 10mA during 500us (1kHz @50%) ???

You will have some difficulties finding a component for this voltage.

Do you already have a power supply that can output this voltage?

i need to do test for power supply so i need to do this kind of test

 

http://www.ppmpower.co.uk/downloads/products/PPM126.pdf

 

I believe there is no such thing as a 40KV semiconductor

see post 10.
80KV MOSFET.
same company makes 120KV semiconductors as well.

 

Well there you go! PPM Power in UK. Just strip everything after "UK" off the link and you have the corporation.