SPECIFICATIONS DETERMINING OUTPUT CURRENT
ABSOLUTE MAXIMUM RATINGS The output current for the motor used when microstepping is determined differently
INPUT VOLTAGE +24 TO +80 VDC
OUTPUT CURRENT 10 AMPS PEAK
PLATE TEMPERATURE 70° C
STORAGE TEMPERATURE 40° TO +125° C
INPUT CURRENT (PINS 1, 2, 3, 4, 6, 7, 8, 9, 10) 15 mA Max
OPERATING TEMPERATURE 0 TO +50° C
ELECTRICAL SPECIFICATIONS (TA=25°C, V+ = 80VDC)
ITEM TEST CONDITION MIN TYP MAX UNITS
Input Voltage 24 80 80 V
Phase Output Current RMS 2 7 A
Phase Output Current Peak 10 A
Quiescent Current Outputs Floating 85 mA
Active Power Iout=7 Amps RMS 19 W
Dissipation
Input Forward Current Input Pins 7 15 mA
1, 2 ,3, 4, 6, 7, 8, 9,10
Input Forward Voltage 1.5 1.7 V
Input Reverse 5 V
Breakdown Voltage
Output Current Fault, Fullstep Outputs 25 mA
Collector-Emitter Fault Output 140 V
Voltage
Collector-Emitter Fault Output 0.2 V
Saturation Voltage Ics=25mA DC
Drain-Source Voltage Fullstep Output 100 V
Drain-Source on Fullstep Output .65 ohms
Resistance Ics=25mA DC
TABLE 3
from that of a half/full unipolar driver. In the MDM10001, a sine/cosine output
function is used in rotating the motor. The output current for a given motor is
determined by the motors current rating and the configuration for how the motor is
hooked up. There is a current adjustment resistor used to set the output current of the
MDM10001. This sets the peak output current of the sine/cosine waves. The
specified motor current (which is the RMS value) is multiplied by a factor of 0.7, 1.0,
or 1.4 depending on the motor configuration (half-coil, series, or parallel).
SETTING OUTPUT CURRENT
The output current on the MDM40001 is set by an external ±1%, 1/8 watt (or higher)
resistor between pins 2 and 3 of connector P2. This resistor determines the per Phase
RMS output current of the driver. The MDM40001 uses a 1mA current source to
establish the reference voltage needed to control the output current. The relationship
between the output current and the resistor value is as follows:
RMS OUTPUT CURRENT (Amps) = (0.707)(0.003)(Resistance in Ohms) See
Figure1
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