"DeusEx"

[Jonathan]

I'll compare with PM752 driver as that's what I have. Copied from Gecko site:

3.5A 50VDC maximum PM752, 75V & greater current
Digitally filtered STEP, DIRECTION and DISABLE inputs same
3.3V and 5V logic compatible inputs Same I think, can go higher with resistor. Also if you accidently pop one with 75V it's easy to replace the optoisolator :naughty:
300 kHz maximum step pulse frequency same, but who needs more than about 50kHz anyway
Top settable Adjust trimpot None
Power LED indicator same
No user settable jumpers PM752 has internal jumpers for motor direction and something else I can't remember ... not much use really
20 kHz switching frequency I'm pretty sure PM752 is much higher, will check it with scope tomorrow
Mid-band resonance compensated Probably none
Microstep to full step morphing at higher speeds Probably none
Small size Nobody cares
Four layer PCB That just means they weren't good enough to make it 2-layer
Discrete all N-channel MOSFET full bridge design same
14A rated power MOSFETs PM752 mosfets are 33A and 100V, so will almost certainly have lower Rds and therefore power dissipation.
3.5mm 12 position connector with screw type terminal Pluggable, which in my opinion is better
Recirculate mode while the motor is stopped, reducing motor heating Probably none
70% current when stationary 50% on PM752 so possibly lower power dissipation - possibly not due to the above, can be changed with a bit of effort

Maybe I should have compared with a different Gecko, but you get the idea.

One more for your reading list:

http://www.scribd.com/doc/29405701/C...osition-Sensor

Looks like vector control is one up from resonance damping.