Here is the mosfet driver stage I'm about to implement to drive an inductive load at 24V and a maximum of 10 amps. The pulse input has bee simplified, but the final device will contain a TTL totem device driving the mosfet. Operating frequency will be a maximum of 500kHz.

$ 1 4.9999999999999996E-6 10.20027730826997 43 5.0 50
f 256 256 304 256 0 1.5
d 336 272 336 240 1 0.805904783
d 304 112 304 160 1 0.805904783
w 336 240 336 192 0
w 304 272 304 304 0
w 336 304 336 272 0
g 320 320 320 336 0
w 336 304 320 304 0
w 304 304 320 304 0
w 320 304 320 320 0
w 336 112 320 112 0
w 320 112 304 112 0
R 176 256 144 256 0 2 40.0 5.0 2.5 0.0 0.5
w 176 256 256 256 0
l 352 80 448 80 0 0.01 -2.525026118406124E-7
R 528 64 528 32 0 0 40.0 24.0 0.0 0.0 0.5
w 528 80 528 64 0
w 320 112 320 80 0
w 320 80 352 80 0
w 448 80 528 80 0
r 256 272 256 320 0 500.0
w 320 320 256 320 0
w 256 272 256 256 0
x 372 51 425 57 0 24 Load
x 351 266 381 272 0 24 D2
x 238 224 268 230 0 24 U1
x 234 147 264 153 0 24 D1
w 336 192 336 112 0
w 304 160 304 240 0
x 181 305 211 311 0 24 R1
o 14 128 0 43 2394.524282602951 0.37414441915671115 0 -1
o 1 128 0 33 1280.0 0.4 1 -1


D1 is a SBL1030 schottky diode for reverse current protection.
D2 is a UF4006 fast recovery rectifier to allow the inductor to freewheel. It is included to prevent the body diode in the mosfet from activating.
U1 is a FQP9N50C mosfet.
R1 is used as a basic pull-down resistor and to provide a minimum load to the pulse generator.
There will also be a 10 amp fast blow circuit breaker included in the built circuit.

Any ideas or suggestions? I'm getting tired of frying output mosfets.

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Replies to This Discussion

I've assembled and tested this setup, and it works beautifully. The on state current on the real circuit is much higher than the simulation shows, so I added the oscillator with an opamp buffer, and increase the opamp voltage to closer reflect the actual current. The real circuit has a 12v supply running the opamp. Here is the full circuit:

http://www.falstad.com/circuit/#%24+1+4.9999999999999996E-6+8.28197...

Micro p/n tcpa4422 and tcpa4421 or TI p/n UCC37321  and UCC37322 are 9amp inverted and non-inverted mosfet drivers set in a DIP-8 package other available like TO-220

 

Agreed Todd, even eliminating the op amp might help, the 555 can probably source more currant, but the driver

would be much, much better especially @ 500 KHZ because of gate cap.

Todd Miller said:

Micro p/n tcpa4422 and tcpa4421 or TI p/n UCC37321  and UCC37322 are 9amp inverted and non-inverted mosfet drivers set in a DIP-8 package other available like TO-220

 

Try n I g b t instead of a straight mosfet

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