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25
(5) When mounting multiple drivers on a single board
When mounting multiple drivers on a single board, the GND design should mount a V
CC
decoupling capacitor, C1, for
each driver to stabilize the GND potential of the other drivers. The key wiring points are as follows.
(6) V
CC
operating limit
When the output (for example F1) of a 2-phase stepper motor driver is turned OFF, the AB phase back electromotive
force eab produced by current flowing to the paired F2 parasitic diode is induced in the F1 side, causing the output
voltage VFB to become twice or more the V
CC
voltage. This is expressed by the following formula.
VFB = V
CC
+ eab
= V
CC
+ V
CC
+ I
OH
RM + Vdf (1.6 V)
V
CC
: Motor supply voltage, I
OH
: Motor current set by Vref
Vdf : Voltage drop due to F2 parasitic diode and current detection resistor R1, RM: Motor winding resistance value
Using the above formula, make sure that VFB is always less than the MOSFET withstand voltage of 100 V. This is
because there is a possibility that operating limit of V
CC
falls below the allowable operating range of 42 V, due to the
RM and I
OH
specifications.
The oscillating voltage in excess of VFB is caused by LCRM (inductance, capacitor, resistor, mutual inductance)
oscillation that includes micro capacitors C, not present in the circuit. Since M is affected by the motor characteristics,
there is some difference in oscillating voltage according to the motor specifications. In addition, constant voltage drive
without constant current drive enables motor rotation at V
CC
0 V.
F1
ON
F2
OFF
V
CC
R1
M
F1
OFF
F2
OFF
V
CC
R1
M
GND
GND
A
p
hase
AB phase
AB
p
hase
A
p
hase
VFB
V
CC
eab
Current path Current path
eab
eab is generated by the
mutual induction M.
24v
GND
5 V
GND
9
9
9
18
18
18
19
19
19
2
6
2
6
2
6
Input
Signals
IC1 IC2 IC3
Motor
1
Thick and short
Short
Thick
Motor
2
Motor
3
Input
Signals
Input
Signals
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26
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STK672-732AN-E

Mfr. #:
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Description:
Motor / Motion / Ignition Controllers & Drivers STEPPING MOTOR DRIVER
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