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參數(shù)資料
| 型號： | PBL3775-1 |
| 廠商： | ERICSSON |
| 元件分類： | 基準電壓源/電流源 |
| 英文描述： | Dual Stepper Motor Driver |
| 中文描述： | 雙步進電機驅動器 |
| 文件頁數(shù)： | 5/8頁 |
| 文件大?。?/td> | 161K |
| 代理商： | PBL3775-1 |
PBL 3775/1
5
Figure 6. Typical stepper motor driver application with PBL 3775/1.
Figure 5. Output stage with current paths
during turn-on, turn-off and phase shift.
Functional Description
Each channel of the PBL 3775/1
consists of the following sections: an
output H-bridge with four transistors and
four recirculation diodes, capable of
driving up to 750 mA continuous current
to the motor winding,
a logic section that controls the output
transistors, an S-R flip-flop, and a com-
parator. 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 R
, effectively
connected in series with the motor
winding. 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 V
, the comparator resets the flip-
flop, which turns off the upper output
transistor. The turn-off of one channel is
independent of the other channel. The
current decreases until the clock
oscillator triggers the flip-flops of both
channels simultaneously, which turns on
the output transistors again, and the
cycle is repeated.
To prevent erroneous switching due to
switching transients at turn-on, the
PBL 3775/1 includes a digital filter. The
clock oscillator provides a blanking
pulse which is used for digital filtering of
the voltage transient across the current
sensing resistor during turn-on.
The current paths during turn-on, turn-
off and phase shift are shown in figure 5.
Applications Information
Current control
The regulated output current level to the
motor winding is determined by the
voltage at the reference input and the
value of the sensing resistor, R
. The
peak current through the sensing
resistor (and the motor winding) can be
expressed as:
I
M,peak
= 0.1V
R
/ R
S
[A]
With a recommended value of 0.5 ohm
for the sensing resistor R
S
, a 2.5 V
reference voltage will produce an output
current of approximately 500 mA. R
should be selected for maximum motor
current. Be sure not to exceed the
absolute maximum output current which
is 850 mA. Chopping frequency, winding
inductance and supply voltage also
affect the current, but to much less
extent.
For accurate current regulation, the
sensing resistor should be a 0.5 - 1.0 W
precision resistor, i. e. less than 1%
tolerance and low temperature
coefficient.
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 pulse
disables the comparators for a short
time. Thereby any voltage transient
across the sensing resistor will be
ignored during the blanking time.
3
2
1
R
S
V
MM
Fast Current Decay
Slow Current Decay
Motor Current
Time
1 2
3
Phase
Dis
V
Phase
Dis
V
RC
11
1
1
2
2
R1
R2
E
C
E
2
C
GND
PBL 3775/1
12 k
4 700 pF
0.47
0.47
M
M
M
M
A1
B1
A2
B2
V
CC
V
V
MM1
MM2
+5 V
+5 V
3
1
20
22
9
10
7
12
4
19
5, 6,
17, 18
15
21
8
1
1
2
2
RS
RS
14
13
16
STEPPER
MOTOR
V
Pin numbers refer
to DIL package.
+
10
μ
F
0.1
μ
F
GND (V )
GND (V
)
0.1
μ
F
MM
相關PDF資料 |
PDF描述 |
|---|---|
| PBL3775N | Dual Stepper Motor Driver |
| PBL3775SO | Dual Stepper Motor Driver |
| PBL3775QN | Dual Stepper Motor Driver |
| PBL37761 | Dual Controller IC for High Current Stepper Motor Applications |
| PBL3776-1 | Dual Controller IC for High Current Stepper Motor Applications |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| PBL3775N | 制造商:ERICSSON 制造商全稱:Ericsson 功能描述:Dual Stepper Motor Driver |
| PBL3775QN | 制造商:ERICSSON 制造商全稱:Ericsson 功能描述:Dual Stepper Motor Driver |
| PBL3775SO | 制造商:ERICSSON 制造商全稱:Ericsson 功能描述:Dual Stepper Motor Driver |
| PBL37761 | 制造商:ERICSSON 制造商全稱:Ericsson 功能描述:Dual Controller IC for High Current Stepper Motor Applications |
| PBL3776-1 | 制造商:ERICSSON 制造商全稱:Ericsson 功能描述:Dual Controller IC for High Current Stepper Motor Applications |
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