N
Nav2u
- Jan 1, 1970
- 0
Hey Guys,
I am making a stepper motor controller to control a stepper motor rated
@ 1A 3.15ohm using the
UCN5804(www.allegromicro.com/datafile/archive/5804.pdf) chip. The motor
operates fine if i use 10ohm resistors @ 5volts (L/R Drive as shown on
page 5 of the datasheet). What i would like to ideally do is limit
current using a MOSFET instead of a resistor, currently i am driving
the MOSFET gate with a 20KHz signal @ 63% duty cycle which i think
should give me 3.15V but this does not seem to work; on putting this
circuit together i find that the motor windings are energised but the
motor does not operate, it is as-though the motor is not getting enough
juice. Is it possible to limit the current in this manner; what am i
doing wrong??? suggestions...
I am making a stepper motor controller to control a stepper motor rated
@ 1A 3.15ohm using the
UCN5804(www.allegromicro.com/datafile/archive/5804.pdf) chip. The motor
operates fine if i use 10ohm resistors @ 5volts (L/R Drive as shown on
page 5 of the datasheet). What i would like to ideally do is limit
current using a MOSFET instead of a resistor, currently i am driving
the MOSFET gate with a 20KHz signal @ 63% duty cycle which i think
should give me 3.15V but this does not seem to work; on putting this
circuit together i find that the motor windings are energised but the
motor does not operate, it is as-though the motor is not getting enough
juice. Is it possible to limit the current in this manner; what am i
doing wrong??? suggestions...