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Overunity Machines Forum



MCP1406/07 MOSFET DRIVER

Started by Jeg, September 30, 2013, 03:53:33 PM

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Jeg

Hi to all :)

Does anyone know how to supply MCP1406 driver? It has an output capability of 1.3A continues current, and 6A pulsed current. I used a simple LM7818 but after some seconds driver was gone! LM7818 was very hot but it survived. MCP1406 not!!!

I attach my driver circuit to see if i made other mistakes. Input is a CMOS pulse train of 1.3MHz. Output goes straight to IRFP460 which switches a dc voltage of 400V.

Thanks
Jeg

TinselKoala

I dunno. Try using one or the other of the outputs, not both to the same mosfet gate.


Jeg

Hey Tinsel
Thanks for the reply

I "discovered" yesterday that MCP1406 has the same layout as TC4429. My connections on driver side seem to be right. The two outputs are linked together to make a push pull output that has active rise and fall times. That makes the mosfet to be quicker and able to achieve really short pulses.

What i did wrong in the first place, was the system test topology. I had gave 18V pulses for mosfet input (mc1406 output), while at the same time mosfet's Vdd was lower than that (12V from a battery) That is wrong because the mosfet's intrinsic diode starts to conduct and high amperage passes from Vdd to ground. So i burned the driver and finally my IRFP460 mosfet.

This was my first mistake.
Then i raised Vdd to higher voltage and that stopped the  "destroy effect" ;D But still no output at mosfet's side.
I will test some different values of Rbias and Rgate, but i am not sure that it will make it.

My main purpose is to create pulses as short as 400-500 ns from a dc source. 400V Vdd, 18V dc pulses Vgate (400ns).
I have the dc source and i 'd like to switch it!
Is that realistic with the above values???   

TinselKoala

OK... can you show your complete circuit including the power supply voltages?
I'm using IRFP460 in my Class E SSTC and when it is working right it makes pretty fast pulses, it operates at around 4 MHz. But I'm not using a driver chip.

Jeg

Which method you recommend to make it pulse at 4MHz? I used TLC555 and i reached around only 1,3MHz.!
In the drawing Vdd is 3x 12V batteries in series. Second step is to keep this 60 OHm load, and raise Vdd to 400V.