NJM3772D2 데이터 시트보기 (PDF) - Japan Radio Corporation
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NJM3772D2 Datasheet PDF : 9 Pages
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NJM3772
s APPLICATIONS INFORMATION
Current control
The output current to the motor winding is determined by the voltage at the reference input and the sensing
resistor, RS.
Chopping frequency, winding inductance and supply voltage also affect the current, but to much less extent.
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
0.47 ohm for the sensing resistor RS, a 2.5 V reference voltage will produce an output current of approximately
960 mA.
To improve noise immunity on the VR input, the control range may be increased to 5 V if RS is correspondingly
changed to 1 ohm.
+5 V
V MM
0.1µ F
22
RB
18
0.5 Ω
11
RB
27
0.5 Ω
5
V
CC
19
V
MM1
V
BB1
V
MM2
V
BB2
MA1
Phase 1
20
V R1
26
Phase
2
25
NJM3772
MB1
M A2
V R2
M B2
RC GND
23
+5 V 15 kΩ
3300 pF
1, 2,
3, 9,
28, 13,
14, 15,
16, 17,
C1
E1
21 10
1 kΩ
C2
E2
24
6
1 kΩ
820 pF
RS
820 pF
RS
GND (VCC )
0.5 Ω
0.5 Ω
D1 D2
12
+
10 µF
8
4
7
STEPPER
MOTOR
D3 D4
V MM
D1 - D4 are UF 4001 or
BYV 27, t rr ≤ 100 ns.
Pin numbers GND (VMM)
refer to PLCC
package.
Figure 6. Typical stepper motor driver application with NJM3772
VCC (+5V)
To
mP
+2.5V
25
D0
14
VDD
16 D7
NJU39610
27 A0
28 A1
15
1
7
WR
CS
9 RESET
V Ref
VSS
2
0.1 µF
RB
0.5 Ω
RB
0.5 Ω
D1
22
18 11
27
5
12
Sign1
10
DA1
4
Sign2
6
DA2
V CC
V MM1
V BB1
V MM2
V
BB2
MA1
12
19
Phase 1
20
VR1
26
Phase 2
NJM3772
MB1 8
4
MA2
25
VR2
MB2 7
RC GND C1
E1 C2
E2
23 1, 2, 21 10 24
6
+5 V 15 kΩ
3, 9,
28, 13,
1 kΩ
1 kΩ
D3
3300 pF
14, 15,
16, 17,
820 pF
RS
820 pF
RS
0.5 Ω
0.5 Ω
V MM
+
10 µF
D2
STEPPER
MOTOR
D4
V MM
D1 - D4 are UF 4001 or
BYV 27, t rr 100 ns
Pin numbers refer to
PLCC package.
Figure 7. Microstepping system with NJU39610 and NJM3772
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