NJM3771 데이터 시트보기 (PDF) - Japan Radio Corporation
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NJM3771 Datasheet PDF : 9 Pages
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NJM3771
s APPLICATIONS INFORMATION
Current control
The output current to the motor winding is mainly determined by the voltage at the reference input and the value of
the sensing resistor, RS.
Chopping frequency, winding inductance, and supply voltage will affect the current level, but to much less extent.
Fast current decay setting will produce somewhat lower (average) current than slow current decay. The peak
current through the sensing resistor (and motor winding) can be expressed as:
IM,peak = 0.18 • (VR / RS) [A]
i.e., with a recommended value of 1 ohm for the sensing resistor, RS, a 2.5 V reference voltage will produce an
output current of approximately 450 mA. To improve noise immunity on the VR input, the control range may be
increased to
5 volts if RS is correspondingly changed to 2 ohms.
VCC (+5 V)
0.1 µF
0.1 µF
V MM
+
10 µF
11
3
20
V
7 Phase 1 CC
V
MM1
V
MM2
MA1
4
8 CD1
9 VR1
16 Phase 2
15 CD 2
14 V R2
RC GND
NJM 3771
C1
E1 C2
MB1 1
19
MA2
MB2 22
E2
12 5, 6,
10
2 13
21
+5 V 15 kΩ
17, 18
1 kΩ
1 kΩ
3 300 pF
GND
(VCC )
820 pF
820 pF
1.0 Ω R S
1.0 Ω RS
STEPPER
MOTOR
Pin numbers refer
to DIP package.
GND (VMM)
Figure 6. Typical stepper motor application with NJM3771
VCC (+5 V)
0.1 µF
0.1 µF
V MM
+
10 µF
To
P
+2.5V
14
D0
5
VDD
7 D7
NJU 39610
15
16
A0
A1
6
17
22
WR
CS
1 RESET
V Ref
VSS
18
GND
(VCC )
11
3
20
Sign1 3
CD1 4
DA1 2
Sign2 20
CD2 19
DA2 21
V
7 Phase 1 CC
V
MM1
V
MM2
MA1
4
8 CD1
9 VR1
16
Phase 2
NJM 3771
MB1 1
19
MA2
15 CD 2
14
V R2
MB2 22
RC GND C1
E1 C2
E2
12 5, 6,
10
2 13
21
+5 V 15 kΩ
17, 18
1 kΩ
1 kΩ
3 300 pF
820 pF
820 pF
1.0 Ω R S
1.0 Ω R S
STEPPER
MOTOR
Pin numbers refer
to DIP package.
GND (VMM)
Figure 7. Microstepping system with NJU39610 and NJM3771
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