pbl3771so ETC-unknow, pbl3771so Datasheet - Page 4

• Manufacturer Part Number: pbl3771so
• Description: Precision Stepper Motor Driver
• Manufacturer: ETC-unknow

PBL 3771/1
Figure 4. Pin configuration.
Pin Description
Refer to figure 4.
SO
2
3
4
5
6,7,
18,19
8
9
10
11
12
13
14
15
16
17
20
21
22
23
4
Phase
VMM
GND
GND
MA
CD
MB
VR
V
DIP
1
2
3
4
5,6,
17,18
7
8
9
10
11
12
13
14
15
16
19
20
21
22
NC
C
cc
E
1
1
1
1
1
1
1
1
12
10
11
6
1
2
3
4
5
7
8
9
3771/1 SO
PLCC
8
10
11
12
1-3,9,
13-17,28
18
19
20
21
22
23
24
25
26
27
4
5
6
7
PBL
Symbol
M
E
V
M
GND
Phase
CD
V
C
V
RC
C
V
CD
Phase
M
V
E
M
15
13
24
23
22
21
20
19
18
17
16
14
1
MM1
R1
CC
R2
MM2
2
1
2
B1
A1
A2
B2
RC
NC
VR
MB
E
VMM
MA
GND
Phase
CD
C
GND
1
2
2
2
2
2
2
2
1
2
2
2
Description
Motor output B, channel 1. Motor current flows from M
Common emitter, channel 1. This pin connects to a sensing resistor to ground.
Motor supply voltage, channel 1, 10 to 40 V. V
Motor output A, channel 1. Motor current flows from M
Ground and negative supply. Note: these pins are used thermally for heat-sinking.
Make sure that all ground pins are soldered onto a suitably large copper ground
plane for efficient heat sinking.
Controls the direction of motor current at outputs M
to M
Current decay control, channel 1. A logic HIGH on this input results in slow current decay,
a LOW results in fast current decay, see “Functional Description.”
Reference voltage, channel 1. Controls the threshold voltage for the comparator and hence
the output current. Input resistance is typically 2.5 kohms, 20%.
Comparator input channel 1. This input senses the instantaneous voltage across the
sensing resistor, filtered by an RC network. The threshold voltage for the comparator is
(0.450 / 2.5) • V
Logic voltage supply, nominally +5 V.
Clock oscillator RC pin. Connect a 15 kohm resistor to V
ground to obtain the nominal switching frequency of 26.5 kHz.
Comparator input channel 2. This input senses the instantaneous voltage across the
sensing resistor, filtered by an RC network. The threshold voltage for the comparator is
Reference voltage, channel 2. Controls the threshold voltage for the comparator and hence
the output current. Input resistance is typically 2.5 kohms, 20%.
Current decay control, channel 2. A logic HIGH on this input results in slow current decay,
a LOW results in fast current decay, see “Functional Description.”
Controls the direction of motor current at outputs M
to M
Motor output A, channel 2. Motor current flows from M
Motor supply voltage, channel 2, 10 to 40 V. V
Common emitter, channel 2. This pin connects to a sensing resistor to ground.
Motor output B, channel 2. Motor current flows from M
(0.450 / 2.5) • V
B1
B2
when Phase
when Phase
Phase
V
GND
GND
M
CD
MM1
M
V
V
E
CC
C
R1
R1
B1
A1
R1
1
1
1
1
, i.e. 450 mV at V
, i.e. 450 mV at V
1
2
10
11
1
2
3
4
5
6
7
8
9
is HIGH.
is HIGH.
3771/1N
PBL
R1
R1
22
21
20
19
18
17
16
15
14
13
12
= 2.5 V.
= 2.5 V.
C
M
E
V
M
GND
GND
Phase
CD
V
RC
R2
2
2
MM2
A2
B2
2
2
MM1
MM1
and V
and V
A1
A2
V
V
and M
and M
GND
M
M
MM1
MM2
A1
A1
A2
A2
E
E
B2
B1
1
MM2
MM2
2
to M
to M
CC
to M
to M
10
11
5
6
7
8
9
and a 3300 pF capacitor to
should be connected together.
should be connected together.
B1
B2
PBL 3771/1QN
B1
B1
B2
B2
. Motor current flows from M
. Motor current flows from M
when Phase
when Phase
when Phase
when Phase
1
1
2
2
is HIGH.
is HIGH.
is HIGH.
is HIGH.
25
24
23
22
21
20
19
V
C
RC
V
C
V
CD
CC
R2
R1
2
1
1
A1
A2