High voltage transistor

[Ioannis]

Thanks Ron, although the project was canelled. It is been two years now...

It was a switching controller for high voltage low current load.

Ioannis

[ronsimpson]

That does not tell me much.

High voltage transistors (NPN) are slow!! An 800 Volt transistor is faster than a 1000V part. The 1500 volt parts I used are dog slow.

My experiance is from switching power supplies, solar/wind, CRT monitors and TV sets. A 1500 volt transistor will not run at 200khz. Maybe not at 100khz. Your AC loss will be huge! Not knowing what you are doing....you may need a 1500 V. diode that may burn 5 watts alone.

Most high voltage junction transistors were made for CRT monitors. They are not in production! I used a high voltage J-FET that I liked. (Silicon Carbide) I can't get the part number from my head.

It was a switching controller for high voltage low current load.

Ioannis

[Ioannis]

It doesn't matter anymore Ron.

The project is cancelled over 1 and a half year now.

I do not know what exactly my customer would do, but asked me to make a 200KHz, 1,5KV switch for as much as 100mA.

Ioannis