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參數(shù)資料
| 型號： | NJM3773E3 |
| 廠商： | New Japan Radio Co., Ltd. |
| 元件分類： | 基準電壓源/電流源 |
| 英文描述： | DUAL STEPPER MOTOR DRIVER |
| 中文描述： | 雙步進電機驅(qū)動器 |
| 文件頁數(shù)： | 7/9頁 |
| 文件大?。?/td> | 170K |
| 代理商： | NJM3773E3 |
NJM3773
Current sense filtering
At turn-on a current spike occurs, due to the recovery of the recirculation diodes and the capacitance of the motor
winding. To prevent this spike from reseting the flip-flops through the current sensing comparators, the clock
oscillator generates a blanking pulse at turn-on. The blanking pulse disables the comparators for a short time.
Thereby any voltage transient across the sensing resistor will be ignored during the blanking time.
Choose the blanking pulse time to be longer than the duration of the switching transients by selecting a proper C
T
value. The time is calculated as:
t
= 210 C
[s]
As the C
value may vary from approximately 2 200 pF to 33 000 pF, a blanking time ranging from 0.5
μ
s to 7
μ
s is
possible. Nominal value is 4 700 pF, which gives a blanking time of 1.0
μ
s.
As the filtering action introduces a small delay, the peak value across the sensing resistor, and hence the peak
motor current, will reach a slightly higher level than what is defined by the reference voltage. The filtering delay
also limits the minimum possible output current. As the output will be on for a short time each cycle, equal to the
digital filtering blanking time plus additional internal delays, an amount of current will flow through the winding.
Typically this current is 1-10 % of the maximum output current set by R
.
Sometimes it may be necessary to include an external in the feed back loop, the filtering may be done by adding
an external low pass filter in series with the comparator C input. In this case the digital blanking time should be as
short as possible. The recommended filter component values are 1 kohm and 820 pF.
To create an absolute zero current, the Dis input should be HIGH.
Switching frequency
The frequency of the clock oscillator is set by the timing components R
and C
at the RC-pin. As C
sets the digital
filter blanking time, the clock oscillator frequency is adjusted by R
T
. The value of R
T
is limited to 2 - 20 kohm. The
frequency is approximately calculated as:
f
= 1 / ( 0.77 R
C
)
Nominal component values of 12 kohm and 4 700 pF results in a clock frequency of 23.0 kHz. A lower frequency
will result in higher current ripple, but may improve low level linearity. A higher clock frequency reduces current
ripple, but increases the switching losses in the IC and possibly the iron losses in the motor.
Phase inputs
A logic HIGH on a Phase input gives a current flowing from pin M
into pin M
. A logic LOW gives a current flow in
the opposite direction. A time delay prevents cross conduction in the H-bridge when changing the Phase input.
Dis (Disable) inputs
A logic HIGH on the Dis inputs will turn off all four transistors of the output H-bridge, which results in a rapidly
decreasing output current to zero.
Figure 8. Typical thermal resistance vs. PC
Board copper area and suggested layout
Thermal resistance [
°
C/W]
PCB copper foil area [cm ]
PLCC package
DIP package
2
80
70
60
50
40
30
20
5
10
15
20
30
35
25
V
R1
140%
100%
Dis
1
Phase
1
Phase
2
Dis
2
I
MA1
I
MA2
100%
–100%
–140%
–100%
–140%
100%
Full step mode
Half step mode
Modified half step mode
V
R2
140%
100%
140%
140%
Figure 9. Stepping modes
22-pin
DIP
24-pin
EMP
28-pin
PLCC
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PDF描述 |
|---|---|
| NJM3773 | DUAL STEPPER MOTOR DRIVER |
| NJM3773D2 | DUAL STEPPER MOTOR DRIVER |
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| NJU7045 | 10-V Precision Micropower Shunt Voltage Reference, 0.5% accuracy 3-SOT-23 -40 to 85 |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| NJM3773E3-TE2 | 功能描述:馬達/運動/點火控制器和驅(qū)動器 Dual Stepper 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 安裝風格:SMD/SMT 封裝 / 箱體:HTSSOP-28 封裝:Tube |
| NJM3773FM2 | 功能描述:馬達/運動/點火控制器和驅(qū)動器 Dual 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 安裝風格:SMD/SMT 封裝 / 箱體:HTSSOP-28 封裝:Tube |
| NJM3773FM2-TE3 | 功能描述:馬達/運動/點火控制器和驅(qū)動器 Dual Stepper 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 安裝風格:SMD/SMT 封裝 / 箱體:HTSSOP-28 封裝:Tube |
| NJM3774 | 制造商:NJRC 制造商全稱:New Japan Radio 功能描述:DUAL STEPPER MOTOR DRIVER |
| NJM3774D2 | 功能描述:馬達/運動/點火控制器和驅(qū)動器 Dual 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 安裝風格:SMD/SMT 封裝 / 箱體:HTSSOP-28 封裝:Tube |
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