njm13775 New Japan Radio Co.,Ltd, njm13775 Datasheet - Page 6

• Manufacturer Part Number: njm13775
• Description: Dual Stepper Motor Driver
• Manufacturer: New Japan Radio Co.,Ltd

NJM13775
Current control
value of the sensing resistor, R
expressed as:
current of approximately 500 mA. R
maximum output current of 500 mA. Chopping frequency, winding inductance and supply voltage also affect the current,
but to much less extent.
tolerance and low temperature - coefficient.
Constant Voltage Control
to V
- 6 -
The regulated output current level to the motor winding is determined by the voltage at the reference input and the
I
With a recommended value of 0.5 ohm for the sensing resistor R
For accurate current regulation, the sensing resistor should be a 0.5 -1.0 W precision resistor, i. e. less than 1%
Since there is no current detection, R
APPLICATIONS INFORMATION
M,peak
CC
. RC Pin require R
= 0.1•V
R
/ R
Figure 7. Half stepping system where NJU7380 is used as controller circuit in order
to generate the necessary sequence to the NJM13775.
Half/Full Step
GND(VCC)
S
Direction
RESET
[A]
STEP
T
Figure 6. Typical stepper motor driver application with NJM13775.
(12k ) and C
+
4.7uF
STEP
DIR
HSM
RESET
Ct
SGND
S
VDD
. The peak current through the sensing resistor (and the motor winding) can be
S
NJU
7380
7380
should be selected for maximum motor current. Be sure not to exceed the absolute
NJU
PGND MO
T
S
(4700pF) to reset inner RS flip-flop at the time of turn-on.
ACD
is unnecessary. Therefore E
Dis1
Dis2
P1
P2
R3
R1
R2
MO
+5V
410k
12k
4700pF
Phase1
Dis1
VR1
Phase2
Dis2
VR2
RC GND
VCC
S
1
, a 2.5 V reference voltage will produce an output
, E
NJM13775
NJM13775
VMM1 VMM2
E1
2
RS
0.47
, C
C1
1
, C
E2
2
RS
0.47
connect to GND and V
C2
0.1uF
MA1
MB1
MA2
MB2
+
GND(VMM)
STEPPER
10uF
MOTOR
R1
, V
R2
connect