Anaheim MDM60001 User Manual
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8
SPECIFICATIONS
DETERMINING OUTPUT CURRENT
ABSOLUTE MAXIMUM RATINGS
The output current for the motor used when microstepping is determined differently from
INPUT VOLTAGE
+24 TO +75 VDC
OUTPUT CURRENT
6 AMPS PEAK
PLATE TEMPERATURE
70° C
STORAGE TEMPERATURE
40° TO +125° C
INPUT CURRENT (PINS 1, 2, 4, 5)
15 mA Max
ELECTRICAL SPECIFICATIONS (TA=25
EE
C, V+ = 75VDC)
ITEM
TEST CONDITION
MIN
TYP
MAX
UNIT
S
Input Voltage
24
75
V
Phase Output Current
RMS
1
4
A
Phase Output Current
Peak
1.4
6
A
Quiescent Current
Outputs Floating
13
mA
Active Power
Iout=4 Amps RMS
9
W
Dissipation
Input Forward Current
Input Pins
7
15
mA
1, 2 , 4, 5
Input Forward Voltage
1.4
1.7
V
Input Reverse
5
V
Breakdown Voltage
Output Current
Fault, Fullstep
25
mA
Outputs
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
6.5
ohms
Resistance
Ics=25mA DC
that of a halfstep/fullstep unipolar driver. In the MDM60001, a sine/cosine output current
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 MDM60001. 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 MDM60001 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 MDM60001 uses a 2mA 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) = (.707)(0.002)(Resistor in Ohms)
RMS Current
Resistor Value
RMS Current
Resistor Value
1.0
698
2.5
1740
1.2
845
2.6
1820
1.4
988
2.7
1890
1.6
1110
2.9
2030
1.7
1180
3.0
2100
1.9
1330
3.2
2230
2.0
1400
3.3
2320
2.2
1540
3.4
2370
2.3
1600
3.8
2670
2.4
1670
4.0
2870
TABLE 3: RESISTOR VALUES WITH RESPECT TO OUTPUT CURRENT
Closest 1% value selected
WARNING! A current adjustment resistor is always necessary to keep the drive in a safe
operating region. Do not operate the driver without a current adjustment resistor. When
connecting the CURRENT ADJUSTMENT resistor between Pins 3 and 2 of Connector P2
the length of the leads should be as short as possible to help minimize the noise coupled
into the driver . Refer to Figure 1 for TYPICAL HOOK-UP.