NJM3775E3 데이터 시트보기 (PDF) - Japan Radio Corporation
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NJM3775E3 Datasheet PDF : 10 Pages
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NJM3775
s APPLICATIONS INFORMATION
Current control
The regulated output current level to the motor winding is determined by the voltage at the reference input and the
value of the sensing resistor, RS. The peak current through the sensing resistor (and the motor winding) can be
expressed as:
I = 0.1•V / R [A]
M,peak
R
S
With a recommended value of 0.5 ohm for the sensing resistor RS, a 2.5 V reference voltage will produce an output
current of approximately 500 mA. RS should be selected for maximum motor current. Be sure not to exceed the
absolute maximum output current which is 850 mA. Chopping frequency, winding inductance and supply voltage
also affect the current, but to much less extent.
For accurate current regulation,
the sensing resistor should be a 0.5 -1.0 W precision resistor, i. e. less than 1% tolerance and low temperature -
coefficient.
+5 V
V MM
0.1µF
0.1 µF
+
10 µF
12
4
19
V
9 Phase1 CC
V
MM1
V
MM2
MA1
3
10 Dis1
7 VR1
14 Phase 2
13
Dis2
16 V R2
RC GND
NJM3775
C1
E1 C2
MB1 1
20
MA2
MB2 22
E2
11 5, 6, 8
2 15
21
+5 V 12 kΩ
17, 18
STEPPER
MOTOR
4 700 pF
GND (VCC )
RS
0.47 Ω
RS
0.47 Ω
Pin numbers refer
to DIP package.
GND (VMM )
Figure 6. Typical stepper motor driver application with NJM3775.
VCC (+5 V)
Direction
Step
Half/Full
Step
+
4.7 µF
4x
10 kΩ
16
6
V
CC
DIR
4
7
PA1
STEP
10
NJM
11 HSM 3517
INH
2
8
fl
P
B1
9
B
flA
GND
3
GND (VCC )
0.1 µF
0.1µ F
V MM
+
10 µF
12
4
19
V
9 Phase1 CC
V
MM1
V
MM2
MA1
3
10 Dis1
7 VR1
14
Phase 2
13 Dis2
16 V R2
RC GND
NJM3775
C1
E1 C2
MB1 1
20
MA2
MB2 22
E2
11 5, 6, 8
2 15
21
12 kΩ
17, 18
STEPPER
MOTOR
4 700 pF
RS
1.0 Ω
RS
1.0 Ω
Pin numbers refer
to DIP package.
GND (VMM )
Figure 7. Half stepping system where NJM3517 is used as controller circuit in
order to generate the necessary sequence to the NJM3775.
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