RESISTOR TABLE REDUCING OUTPUT CURRENT
RMS Current Resistor Value RMS Current Resistor Value
2.0 931 4.2 2000
2.1 1000 4.4 2050
2.3 1070 4.5 2100
2.4 1130 4.7 2150
2.5 1180 4.8 2260
2.7 1270 4.9 2320
2.8 1330 5.1 2370
3.0 1400 5.2 2430
3.1 1470 5.4 2490
3.3 1500 5.5 2610
3.4 1580 5.7 2670
3.5 1650 6.0 2800
3.7 1690 6.4 3010
3.8 1780 6.7 3160
4.0 1870 7.07 3320
4.1 1910 - -
TABLE 4: 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.
NOTE: When connecting the CURRENT ADJUSTMENT resistor between Pins 4 and
5 of Connector P2 the length of the leads should be as short as possible to help
minimize the noise coupled into the driver (See Figure 2).
Reduction Current (Amps) = .003 x .707 x *R(Current Adjust) x R(Current
Reduction)
R(Current Adjust) + R(Current
Reduction)
Reducing the output current in the MDM10001 can be accomplished by connecting an
external 1/8 watt (or higher) resistor between pins 3 and 4 of connector P2 and then
by either activating pin 10 on connector P1 or occurs automatically 1 second after the
last positive going edge of the step clock input. See Figure 1 for TYPICAL HOOK-UP.
When pin 10 on connector P1 is pulled LOW, (Active) the output current of each phase
will reduce to the value set by the current reduction resistor.
The amount of current per phase in the reduction mode is related to the value of the
current adjustment resistor and the current reduction resistor. When the current
reduction circuit is activated, the current reduction resistor is paralleled with the
current adjustment resistor. This lowers the total resistance value, and thus lowers the
per phase output current. The relationship between the output current and the resistor's
value is as follows:
NOTE: When connecting the current reduction resistor between pins 3 and 4 of
connector
P2 , the length of the leads should be as short as possible to help minimize noise
coupled into the driver.
MOTOR SELECTION
The MDM10001 is a Bipolar driver which works equally well with both Bipolar and
Unipolar motors,( i.e. 8 and 4 lead motors and 6 lead center tapped motors).
Motors with low current ratings and high inductance will perform better at low speeds,
providing high low-end torque. Motors with high current ratings and low inductance
will perform better at high speeds, providing high high-end torque.
Since the MDM10001 is a constant current source, it is not necessary to use a motor
that is rated at the same voltage as the supply voltage. What is important is that the
MDM10001 is set to the appropriate current. Higher voltage will cause the current to
flow faster through the motor coils. This in turn means higher step rates can be
achieved. Care should be taken not to exceed the maximum voltage of the driver.
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