Stepper Motor Driver AD1431
YA7179-1/2
- 13 -
5-3. SW2 setting
SW2 (rotary switch) can switch the driving current.
SW2 setting value :
SW2 setting value
Current value
（
A
）
0
0.11
1
0.19
2
0.32
3
0.39
4
0.50
5
0.57
6
0.66
7
0.72
8
0.81
9
0.86
A
0.94
B
0.99
C
1.06
D
1.10
E
1.16
F
1.20
Additionally, variable resistor VR1 allows you to set a finer value.
The drive current is adjusted as follows:
1.
For preparation, change the SW2 setting to a value that is close to the target current value Io[A]
according to the above table.
2.
Input the control power from the CN1. Turn off the ACD function.
3.
Measure the voltage V
REF
[V] between TP1 and TP10 (GND). (Please be careful so that probes may
not touch other surrounding checkpin terminals. It may cause short out. We recommend that you
clip probes on the terminals with power off and that measure the voltage without moving probes. ) If
they touch other surrounding checkpin terminals, that may cause malfunction.
4.
Change the variable register VR1, so that V
REF
= Io×1.5.
(When you rotate the VR1 rotor in the CW direction, V
REF
rises. If V
REF
does not change, change the
SW2 setting and adjust the VR1 again.)
As described above, you can set a finer value of current.
At default, the VR1 is adjusted so that the current value is 1.2A when SW2 value is set in "F" on the scale.
By rotating the VR1, you can set current finely between 0.07 to 1.20 [A].
(Please prevent the setting value from becoming more than 1.2A.)
