參數(shù)資料
型號(hào)： PBD35171SO
廠商： ERICSSON
英文描述： Stepper Motor Drive Circuit
中文描述： 步進(jìn)電機(jī)驅(qū)動(dòng)電路
文件頁(yè)數(shù)： 6/10頁(yè)
文件大?。?/td> 135K
代理商： PBD35171SO
PBD 3517/1
6
determined by V
voltage and motor
data, the L/R time-constant.
In a low-voltage system, where high
motor performance is needed, it is also
possible to double the motor voltage by
adding a few external components, see
figure 14.
The time the circuit applies the higher
voltage to the motor is controlled by a
monostable flip-flop and determined by
the timing components R
and C
.
The circuit can also drive a motor in
traditional unipolar way.
An inhibit input (INH) is used to switch
off the current completely.
Logic inputs
All inputs are LS-TTL compatible. If any
of the logic inputs are left open, the
circuit will accept it as a HIGH level. PBD
3517/1 contains all phase logic
necessary to control the motor in a
proper way.
Functional Description
The circuit, PBD 3517/1, is a high
perform-ance motor driver, intended to
drive a stepper motor in a unipolar, bilevel
way. Bilevel means that during the first
time after a phase shift, the voltage
across the motor is increased to a second
voltage supply, V
, in order to obtain a
more-rapid rise of current, see figure 11.
The current starts to rise toward a
value which is many times greater than
the rated winding current. This compen-
sates for the loss in drive current and loss
of torque due to the back emf of the
motor.
After a short time, t
, set by the
monostable, the bilevel output is switched
off and the winding current flows from the
V
supply, which is chosen for rated
winding current. How long this time must
be to give any increase in performance is
STEP — Stepping pulse
One step is generated for each negative
edge of the STEP signal. In half-step
mode, two pulses will be required to move
one full step. Notice the set up time, t
s
, of
DIR and HSM signals. These signals
must be latched during the negative edge
of STEP, see timing diagram, figure 3.
DIR — Direction
DIR determines in which direction steps
will be taken. Actual direction depends on
motor and motor connections. DIR can be
changed at any time, but not simultan-
eously with STEP, see timing diagram,
figure 3.
HSM determines whether the motor will
be controlled in full-step or half-step
mode. When pulled low, a step-pulse will
correspond to a half step of the motor.
HSM can be changed at any time, but not
simultaneously with STEP, see timing
diagram, figure 3.
Figure 15. Voltage
doubling with
external
transistors.
Figure 14.
Typical
application.
RC 12
STEP 7
DIR 6
HSM 10
INH 11
O
A
9
O
B
8
13 L
A
14 L
B
1 P
B2
2 P
B1
5 P
A2
4 P
A1
3 GND
V
CC
16
V
SS
15
PBD 3517/1
PQR
Mono
F - F
Phase
Logic
P
A
P
B
STEP
CW / CCW
HALF / FULL STEP
NORMAL /INHIBIT
(Optional Sensor)
GND
V
CC
CMOS, TTL-LS
Input / Output-Device
V
SS
+ 5V
GND (V
CC
)
V
MM
R9
R8
R
T
C
T
C
3
C
4
C
5
+
+
+
R11
R10
D2
D1
MOTOR
D3-D6
D3-D6 are
UF 4001 or
BYV 27
GND (V
MM
,V
SS
)
D3
+
RC 12
STEP 7
DIR 6
HSM 10
INH 11
O
A
9
O
B
8
13 L
A
14 L
B
1 P
B2
2 P
B1
5 P
A2
4 P
A1
3 GND
V
CC
16
V
SS
15
PBD 3517/1
PQR
Mono
F - F
Phase
Logic
P
A
P
B
STEP
CW / CCW
HALF / FULL STEP
NORMAL /INHIBIT
(Optional Sensor)
GND
V
CC
CMOS, TTL-LS
Input / Output-Device
V
MM
+ 5V
GND (V
CC
)
R9
R8
R
T
C
T
C
3
C
4
+
+
R10
D1
1/2 MOTOR
GND (V
MM
,V
SS
)
R1
R2
Q1
Q3
C1
R12
R13
R4
R5
Q5
Q6
Equal to
Phase A
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