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NJM3772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。 |
部品番号 | NJM3772 |
| |
部品説明 | DUAL STEPPER MOTOR DRIVER | ||
メーカ | New Japan Radio | ||
ロゴ | |||
このページの下部にプレビューとNJM3772ダウンロード(pdfファイル)リンクがあります。 Total 9 pages
DUAL STEPPER MOTOR DRIVER
NJM3772
s GENERAL DESCRIPTION
The NJM3772 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 NJM3772 contains a clock oscillator, which is common
for both driver channels, a set of comparators and flip-flops
implementing the switching control, and two H-bridges with
internal recirculation diodes. Voltage supply requirements are
+5 V for logic and +10 to +45V for the motor. Maximum output
current is 1000mA per channel.
s PACKAGE OUTLINE
NJM3772D2
NJM3772FM2
s FEATURES
• Dual chopper driver
• 1000mA continuous output current per channel
• Specially matched to the Dual DAC NJU39610
• Packages DIP22 / PLCC28
s BLOCK DIAGRAM
NJM3772
Phase 1 VR1
VCC
V
CC
C1
—
+
VMM1
E1
RQ
S
Logic
+
—
RC
Logic
+ SQ
R
—
Phase 2 VR2
C2 GND
VMM2
E2
Figure 1. Block diagram
M A1
M B1
VBB1
VBB2
M B2
M A2
1 Page NJM3772
s FUNCTIONAL DESCRIPTION
Each channel of the NJM3772 consists of the following sections: an output H-bridge with four transistors, capable
of driving up to 1000 mA continuous current to the motor winding; a logic section that controls the output transis-
tors; an S-R flip-flop; and a comparator. The clock-oscillator is common to both channels.
Constant current control is achieved by switching the output current to the windings. This is done by sensing the
peak current through the winding via a current-sensing resistor RS, effectively connected in series with the motor
winding during the turn-on period. As the current increases, a voltage develops across the sensing resistor, which
is fed back to the comparator. At the predetermined level, defined 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 paths during turn-on, turn-off and phase shift are shown in figure 3. Note that the upper recirculation
diodes are connected to the circuit externally.
External recirculation diodes
VMM
1
RB
VBB
2
3
Motor Current
RS
12
3
Fast Current Decay
Slow Current Decay
Time
Figure 3. Output stage with current paths
during turn-on, turn-off and phase shift.
3Pages 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
C 2 E2
24 6
1 kΩ
820 pF
RS
820 pF
RS
GND (VCC )
0.5 Ω
0.5 Ω
D1
12
D2
+
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
22
RB
0.5 Ω
RB
18 11
27
0.5 Ω
5
D1
Sign1
DA1
12
10
Sign2
DA2
4
6
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
23 1, 2,
+5 V 15 kΩ
3, 9,
28, 13,
3300 pF
14, 15,
16, 17,
C1 E1
21 10
1 kΩ
C2
24
E2
6
1 kΩ
820 pF
RS
820 pF
RS
D3
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
6 Page | |||
ページ | 合計 : 9 ページ | ||
|
PDF ダウンロード | [ NJM3772 データシート.PDF ] |
データシートを活用すると、その部品の主な機能と仕様を詳しく理解できます。 ピン構成、電気的特性、動作パラメータ、性能を確認してください。 |
部品番号 | 部品説明 | メーカ |
NJM3770A | STEPPER MOTOR DRIVER | New Japan Radio |
NJM3771 | DUAL STEPPER MOTOR DRIVER | New Japan Radio |
NJM3772 | DUAL STEPPER MOTOR DRIVER | New Japan Radio |
NJM3773 | DUAL STEPPER MOTOR DRIVER | New Japan Radio |