DataSheet.jp

NJM3771 の電気的特性と機能

NJM3771のメーカーはNew Japan Radioです、この部品の機能は「DUAL STEPPER MOTOR DRIVER」です。


製品の詳細 ( Datasheet PDF )

部品番号 NJM3771
部品説明 DUAL STEPPER MOTOR DRIVER
メーカ New Japan Radio
ロゴ New Japan Radio ロゴ 




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NJM3771 Datasheet, NJM3771 PDF,ピン配置, 機能
NJM3771
DUAL STEPPER MOTOR DRIVER
s GENERAL DESCRIPTION
The NJM3771 is a stepper motor driver, which circuit is
especially developed for use in microstepping applications in
conjunction with the matching dual DAC (Digital-to-Analog
Converter) NJU39610.
The NJM3771 contains a clock oscillator, which is common
for both driver channels; a set of comparators and flip-flops
imple menting the switching control; and two H-bridges with
internal recirculation diodes. Voltage supply requirements are
+5 V for logic and +10 to +45 V for the motor. Maximum
output current is 650 mA per channel.
s PACKAGE OUTLINE
NJM3771D2 NJM3771E3
s FEATURES
• Dual chopper driver
• 650 mA output current per channel
• Selectable slow/fast current decay for improved high-
speed microstepping
• Specially matched to Dual DAC NJU39610
• Packages DIP22 / EMP24(Batwing) / PLCC28
NJM3771FM2
s BLOCK DIAGRAM
NJM 3771
Phase 1
CD1 VR1
VCC
V
CC
C1
+
+
+
RC
+
+
E1
RQ
S
Logic
Logic
SQ
R
Phase 2
CD2 VR2
C2 GND
E2
M A1
M B1
VMM1
VMM2
M B2
M A2
Figure 1. Block diagram

1 Page





NJM3771 pdf, ピン配列
NJM3771
s FUNCTIONAL DESCRIPTION
Each channel of the NJM3771 consists of the following sections: an H-bridge output stage, capable of driving up
to 650 mA continuous motor current (or 500 mA, both channels driven), a logic section that controls the output
transistors, an S-R flip-flop, and two comparators. The oscillator is common to both channels.
Constant current control is achieved by switching the current to the windings. This is done by sensing the (peak)
voltage across a current-sensing resistor, R , effectively connected in series with the motor winding, and feeding
S
that voltage back to a comparator. When the motor current reaches a threshold level, determined by the voltage at
the reference input, VR, the comparator resets the flip-flop, which turns off the output transistors. The current
decreases until the clock oscillator triggers the flip-flop, which turns on the output transistors again, and the cycle is
repeated.
The current-decay rate during the turn-off portion of the switching cycle, can be selected fast or slow by the CD
input.
In slow current-decay mode, only one of the lower transistors in the H-bridge (those closest to the negative
supply) is switched on and off, while one of the upper transistors is held constantly on. During turn-off, the current
recirculates through the upper transistor (which one depends on current direction) and the corresponding free-
wheeling diode connected to VMM, see figure 3.
In fast current decay mode, both the upper and lower transistors are switched. During the off-time, the freewheel-
ing current is opposed by the supply voltage, causing a rapid discharge of energy in the winding.
Fast current decay may be required in half- and microstepping applications when rapid changes of motor current
are necessary. Slow current decay, however, gives less current ripple, and should always be selected, if possible,
to minimize core losses and switching noise.
21
3
Rs
Motor Current
12
FAST Current Decay
SLOW Current Decay
3
Time
Figure 3. Output stage with current paths
during turn -on, turn-off and phase shift


3Pages


NJM3771 電子部品, 半導体
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
8 CD1
9 VR1
NJM 3771
MB1
16 Phase 2
15 CD 2
14 V R2
RC GND
12 5, 6,
+5 V 15 k
17, 18
MA2
MB2
C1 E1
10 2
1 k
C2
13
E2
21
1 k
4
1
19
22
3 300 pF
GND
(VCC )
820 pF
1.0
820 pF
R S 1.0
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
NJU39610
15
16
A0
A1
6
17
22
WR
CS
1 RESET
V Ref
VSS
18
GND
(VCC )
11 3
20
Sign1
CD1
DA1
3
4
2
V
7 Phase 1 CC
V
MM1
V
MM2
MA1
8 CD1
9 VR1
NJM3771
MB1
Sign2
CD2
DA2
20
19
21
16
Phase 2
15 CD 2
14
V R2
RC GND
12
+5 V 15 k
5, 6,
17, 18
MA2
MB2
C1 E1
10 2
1 k
C2
13
E2
21
1 k
4
1
19
22
3 300 pF
820 pF
1.0
820 pF
R S 1.0
RS
STEPPER
MOTOR
Pin numbers refer
to DIP package.
GND (VMM)
Figure 7. Microstepping system with NJU39610 and NJM3771

6 Page



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共有リンク

Link :


部品番号部品説明メーカ
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DUAL STEPPER MOTOR DRIVER

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