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기능 High Performance Stepper Motor Drive Circuit
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PBL3770AQNT 데이터시트, 핀배열, 회로
February 1999
PBL 3770A
High Performance
Stepper Motor Drive Circuit
Description
PBL 3770A is a bipolar monolithic circuit intended to control and drive the current in
one winding of a stepper motor. It is a high power version of PBL 3717 and special
care has been taken to optimize the power handling capability without suffering in
reliability.
The circuit consists of a LS-TTL compatible logic input stage, a current sensor, a
monostable multivibrator and a high power H-bridge output stage. The circuit is
pin-compatible with the PBL 3717 industry-standard driver.
Two PBL 3770A and a small number of external components form a complete
control and drive unit for LS-TTL or microprocessor-controlled stepper motor
systems.
Key Features
• Half-step and full-step operation.
• Switched mode bipolar constant
current drive
• Wide range of current control
5 -1800 mA.
• Wide voltage range 10 - 45 V.
• Designed for unstabilized motor
supply voltage.
• Current levels can be selected in
steps or varied continuously.
• Thermal overload protection.
Phase
I
1
I0
VR
GND
VCC
VMM
VMM
Schmitt
Trigger
Time
Delay
1
1
1
&&&&
1
1
MA
MB
+
+
+
Current Sensor
C
Output Stage
Monostable
toff = 0.69 • RT • CT
TE
PBL 3770A
Figure 1. Block diagram.
16-pin plastic batwing DIP
28-pin plastic PLCC package
20-pin SO
1




PBL3770AQNT pdf, 반도체, 판매, 대치품
PBL 3770A
MB 1
T2
VMM 3
GDN 4
GDN 5
GDN 6
GDN 7
VCC 8
I1 9
Phase 10
PBL
3770A
20 E
19 MA
18 VMM
17 GDN
16 GDN
15 GDN
14 GDN
13 VR
12 C
11 I0
MB 1
T2
VMM 3
GND 4
GND 5
VCC 6
I1 7
Phase 8
PBL
3770A
16 E
15 MA
14 VMM
13 GND
12 GND
11 VR
10 C
9 I0
N/C 5
MA 6
N/C 7
E8
GND 9
MB 10
T 11
PBL
3770A
25 N/C
24 VR
23 C
22 N/C
21 I 0
20 Phase
19 I1
Figure 3. Pin configurations.
Pin Description
SO DIP
PLCC
11
22
10
11
3
4-7,
14-18
3,14
4,5,
12,13
12,4
1-3,9,
13-17,28
86
97
18
19
10 8
20
11 9
21
12 10
13 11
23
24
19 15
20 16
6
8
Symbol Description
M Motor output B, Motor current flows from M to M when Phase is high.
B AB
T Clock oscillator. Timing pin connect a 56 kresistor and a 820 pF in
parallel between T and Ground.
VMM Motor supply voltage, 10 to 40 V. Pin 3(12) and pin 14(4) should be wired together.
GND Ground and negative supply. Note these pins are used for heatsinking.
Make sure that all ground pins are soldered onto a suitable large copper
ground plane for efficient heat sinking.
VCC Logic voltage supply normally +5 V.
I1 Logic input. It controls, together with the I0 input, the current level in the output stage.
The controlable levels are fixed to 100, 60, 20, 0%.
Phase
I0
Controls the direction of the motor current of MA and MB outputs.
Motor current flows from MA to MB when the phase input is high.
Logic input. It controls, together with the I1 input, the current level in the output stage.
The controlable levels are fixed to 100, 60, 20, 0%.
C Comparator input. This input senses the instaneous voltage across the sensing
resistor, filtered through a RC Network.
V Reference voltage. Controls the threshold voltage of the comparator and hence
R
the output current. Input resistance: typically 6.8 kΩ ± 20%.
MA Motor output A, Motor current flows from MA to MB when Phase is high.
E Common emitter. Connect the Sence resistor between this pin and ground.
4

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PBL3770AQNT 전자부품, 판매, 대치품
PBL 3770A
Phase
AI
1
I A0
A
VC
C
(+5
V)
VM
M
16
3,
1 14
8
Phas
V
R
V
C
V
M
1
M
7 eI
CM B
9
1
I
0
T
PBL 3770A
GN C
M
A
E
1
5
2 D 4, 5
1
1
12, 13 0
6
56
k
1
k
820 820 0.5
pF pF
STEPPER
MOTOR
Phase
BI
I
1
B0
B
VC
C
(+5
V)
VM
M
16
3,
8
Phas
V1
R
7 Ie
V
C
C
V
M
M
14
M
B
1
9
1
I
0
T
PBL 3770A
GN C
M
A
E
1
5
2 D 4, 5
1
1
12, 13 0
6
56
k1
k
820 820 0.5
pF pF
Diodes are
UF 4001 or
BYV27
t r 100
r ns
Figure 8. Typical stepper motor driver application with PBL 3770A.
VSat (V)
1.8
1.6
1.4
1.2
1.0 Tj = 25°C
.8
.6
Tj = 125°C
.4
.2
0 0 .40 .80 1.2 1.6
I M (A)
Figure 9. Typical source saturation vs.
output current.
VSat (V)
1.8
1.6
1.4
1.2
Tj = 125°C
1.0
.8
.6
.4
.2 Tj = 25°C
0 0 .40 .80 1.2 1.6
I M (A)
Figure 10. Typical sink saturation vs.
output current.
VF (V)
1.8
1.6 Tj = 25 °C
1.4
1.2 Tj = 125°C
1.0
.8
.6
.4
.2
0 0 .40 .80 1.2 1.6
I M (A)
Figure 11. Typical lower diode voltage
drop vs. recirculating current.
Interference
As the circuit operates with switched-
mode current regulation, interference-
generation problems can arise in some
applications. A good measure is then to
decouple the circuit with a 0.1 µF
ceramic capacitor, located near the
package across the power line VMM and
ground.
Also make sure that the VRef input is
sufficiently decoupled. An electrolytic
capacitor should be used in the +5 V rail,
close to the circuit.
The ground leads between R , C and
SC
circuit GND should be kept as short as
possible. This applies also to the leads
connecting RS and RC to pin 16 and pin
10 respectively.
In order to minimize electromagnetic
interference, it is recommended to route
MA and MB leads in parallel on the
printed circuit board directly to the
terminal connector. The motor wires
should be twisted in pairs, each phase
separately, when installing the motor
system.
Unused inputs
Unused inputs should be connected to
proper voltage levels in order to obtain
the highest possible noise immunity.
Ramping
A stepper motor is a synchronous motor
and does not change its speed due to
load variations. This means that the
torque of the motor must be large
enough to match the combined inertia of
the motor and load for all operation
modes. At speed changes, the requires
torque increases by the square, and the
required power by the cube of the speed
change. Ramping, i.e., controlled
acceleration or deceleration must then
be considered to avoid motor pull-out.
VCC , VMM
The supply voltages, VCC and VMM, can
be turned on or off in any order. Normal
dv/dt values are assumed.
Before a driver circuit board is
removed from its system, all supply
voltages must be turned off to avoid
destructive transients being generated
by the motor.
Switching frequency
The motor inductance, together with the
pulse time, t , determines the switching
off
frequency of the current regulator. The
choice of motor may then require other
values on the RT, CT components than
those recommended in figure 6, to
obtain a switching frequency above the
audible range. Switching frequencies
above 40 kHz are not recommended
because the current regulation can be
affected.
Analog control
As the current levels can be continu-
ously controlled by modulating the VR
input, limited microstepping can be
achieved.
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