kyle york wrote: : Greetings, : Dennis Clark wrote: : > kyle york wrote: : > : The Microchip TC4424 or 4427 would work. : > : > So far as I can tell, these can't handled more than about 100ma steady : > state current. The can deal 1.5Amps to charge the gate capacitance of a : > MOSFET, but they can't deliver that kind of current steadily.
: I run a 4424 at 12v / 1 amp continuously without any problems & was : under the impression it could run 3 amps if properly cooled. : > : > DLC Kyle,
I was testing the 4427 this evening at at 7.6V, 150ma the part got distinctly warm. The voltage drop in the parts got pretty high too, only about 3V got to the motor leads at 150ma. It can obviously handle this much current, but it seems that higher currents are not in the cards for the 4427 at least, not with that kind of voltage drop. I was testing with 20 ohm power resistor loads, not a motor, so the dynamics will obviously be different in the real world.
: -- : Kyle A. York : Sr. Subordinate Grunt : DSBU