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參數(shù)資料
| 型號(hào)： | NJM3717 |
| 廠商： | New Japan Radio Co., Ltd. |
| 英文描述： | Stepper Motor Driver(步進(jìn)電機(jī)驅(qū)動(dòng)器) |
| 中文描述： | 步進(jìn)電機(jī)驅(qū)動(dòng)器（步進(jìn)電機(jī)驅(qū)動(dòng)器） |
| 文件頁數(shù)： | 1/2頁 |
| 文件大?。?/td> | 30K |
| 代理商： | NJM3717 |
NJM
3770A
STEPPER
MOTOR
V
CC
V
MM1
Phase
VR
I0
+5 V
To
other IC
RS
GND
1
2
4
5
V
MM2
To
control
logic and
Vref GND
M
A
M
B
6
3
To
Power
Supply
+
-
+
I1
I
MM
I
MM
Solving RFI and noise problems with NJM3717 and NJM3770A
The NJM3717 and NJM3770A are chopper (switch-mode) type stepper motor drivers. Due to the operation of
these circuits, electromagnetic as well as capacitively coupled noise can be generated by the ICs during switching
and may be radiated via surrounding wires and PCB copper tracks.
Magnetic noise is generated by loops on the PCB and couples into nearby circuitry in the same fashion as a
transformer couples power between two windings. The general method to avoid magnetically coupled noise is to
route supply rails close to each other on the PCB and to make current loops as physically small as possible.
Capacitive noise is coupled between adjacent copper tracks or components/component leads on the PC board.
Especially sensitive situations are when two tracks run in parallel on each side of a board or on nearby layers.
Capacitively coupled noise may be eliminated by introducing ground planes between power rails and low level
circuitry on multilayer boards. Separating low level circuitry from power circuits by guarding or screening may also
be needed.
To reduce potential interference when using the NJM3770A (or the NJM3717/2), there are a few basic rules to
follow. Please refer to the figure 1 and the points of discussions indicated by numbers 1 through 6.
1. Recirculating current path
During the turn-off mode of the IC (a complete description of the operation of the NJM3717/3770A can be found in
the data sheets) the motor current recirculates through the external free-wheeling diodes as indicated by the
magnetic field which can induce noise voltage in adjacent circuitry. To reduce potential problems, the recirculation
diodes should be located as close to the IC as possible.
2. Filtering of power supply rails
An LC filter in the positive supply rail reduces noise that may be spread to other circuits. Suitable values are:
inductor, 10 - 100 mH; and capacitor, 10 mF + 0.1 mF. The LC filter should be located as close to the circuit as
possible, and the capacitor connected to power ground.
3. Grounding
It is essential to understand that the power ground of the circuit is at the point where the sensing resistor RS
connects to the negative supply. Thus, this ground connection should be separated from all other ground returns,
especially those of sensitive low-level circuits. Signal ground is at the ground pins of the stepper motor driver
circuit, and should be connected to a common ground point, preferably close to the power connector on the PC
board.
Figure 1. Circuit showing proper printed circuit board layout design.
Figure 1, normal motor current at full
step
Figure 2, motor current at full step
with resonace problem.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| NJM3770AE2 | STEPPER MOTOR DRIVER |
| NJM3770A | STEPPER MOTOR DRIVER |
| NJM3770AD3 | STEPPER MOTOR DRIVER |
| NJM3770AFM2 | STEPPER MOTOR DRIVER |
| NJM3771 | DUAL STEPPER MOTOR DRIVER |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| NJM3717D2 | 功能描述:馬達(dá)/運(yùn)動(dòng)/點(diǎn)火控制器和驅(qū)動(dòng)器 Stepper RoHS:否 制造商:STMicroelectronics 產(chǎn)品:Stepper Motor Controllers / Drivers 類型:2 Phase Stepper Motor Driver 工作電源電壓:8 V to 45 V 電源電流:0.5 mA 工作溫度:- 25 C to + 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:HTSSOP-28 封裝:Tube |
| NJM3717E2 | 功能描述:馬達(dá)/運(yùn)動(dòng)/點(diǎn)火控制器和驅(qū)動(dòng)器 Stepping Motor Driver RoHS:否 制造商:STMicroelectronics 產(chǎn)品:Stepper Motor Controllers / Drivers 類型:2 Phase Stepper Motor Driver 工作電源電壓:8 V to 45 V 電源電流:0.5 mA 工作溫度:- 25 C to + 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:HTSSOP-28 封裝:Tube |
| NJM3717E2-TE2 | 功能描述:馬達(dá)/運(yùn)動(dòng)/點(diǎn)火控制器和驅(qū)動(dòng)器 Stepping Motor Driver RoHS:否 制造商:STMicroelectronics 產(chǎn)品:Stepper Motor Controllers / Drivers 類型:2 Phase Stepper Motor Driver 工作電源電壓:8 V to 45 V 電源電流:0.5 mA 工作溫度:- 25 C to + 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:HTSSOP-28 封裝:Tube |
| NJM3717FM | 功能描述:IC STEPPER MOTOR DRIVER 28-PLCC RoHS:是 類別:集成電路 (IC) >> PMIC - 電機(jī)和風(fēng)扇控制器，驅(qū)動(dòng)器 系列:- 產(chǎn)品變化通告:ATA683(3,4)PLQW Obsolescence 09/Aug/2012 標(biāo)準(zhǔn)包裝:1 系列:- 應(yīng)用:DC 電機(jī)控制器，無刷（BLDC），3 相 評估套件:可供 輸出數(shù):1 電流 - 輸出:100mA 電壓 - 負(fù)載:5.25 V ~ 20 V 電源電壓:5.25 V ~ 20 V 工作溫度:-40°C ~ 150°C 安裝類型:表面貼裝 封裝/外殼:48-VFQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:48-VQFN（7x7） 包裝:剪切帶 (CT) 其它名稱:ATA6833-PLQWCT |
| NJM3717FM2 | 功能描述:馬達(dá)/運(yùn)動(dòng)/點(diǎn)火控制器和驅(qū)動(dòng)器 Stepper RoHS:否 制造商:STMicroelectronics 產(chǎn)品:Stepper Motor Controllers / Drivers 類型:2 Phase Stepper Motor Driver 工作電源電壓:8 V to 45 V 電源電流:0.5 mA 工作溫度:- 25 C to + 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:HTSSOP-28 封裝:Tube |
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