PBL 3771/1
M
1
2
22
21
20
19
M
E
B1
B2
NC
1
2
3
4
5
NC
MB2
E2
24
23
E
1
2
MB1
E1
V
3
V
MM2
MM1
22
21
20
M
4
M
A2
A1
VMM2
VMM1
MA1
V
5
6
25
24
V
C
MM2
R2
E
2
GND
GND
5
18 GND
17 GND
16 Phase
MA2
2
PBL
3771/1 SO
M
M
7
23 RC
PBL
3771/1N
B2
B1
GND
GND
6
7
19
18
6
8
22
21
20
V
CC
PBL 3771/1QN
GND
GND
Phase2
CD2
GND
9
C
V
Phase
7
1
1
2
Phase1
CD1
17
16
15
8
9
E
1
10
11
R1
CD
8
15 CD
2
1
V
19 CD
1
MM1
V
9
14
13
V
R2
VR1 10
VR2
R1
C1
11
14 C2
10
11
C
C
1
2
Vcc
12
13
RC
V
CC
12 RC
Figure 4. Pin configuration.
Pin Description
Refer to figure 4.
SO
DIP
PLCC
Symbol
Description
2
3
1
2
8
MB1
E1
Motor output B, channel 1. Motor current flows from MA1 to MB1 when Phase1 is HIGH.
Common emitter, channel 1. This pin connects to a sensing resistor to ground.
10
11
12
4
3
VMM1
MA1
GND
Motor supply voltage, channel 1, 10 to 40 V. VMM1 and VMM2 should be connected together.
Motor output A, channel 1. Motor current flows from MA1 to MB1 when Phase1 is HIGH.
5
4
6,7,
18,19 17,18
5,6,
1-3,9,
13-17,28
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.
8
7
18
19
20
21
Phase1 Controls the direction of motor current at outputs MA1 and MB1. Motor current flows from MA1
to MB1 when Phase1 is HIGH.
9
8
CD1
VR1
C1
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) • VR1, i.e. 450 mV at VR1 = 2.5 V.
10
11
9
10
12
13
11
12
22
23
VCC
RC
Logic voltage supply, nominally +5 V.
Clock oscillator RC pin. Connect a 15 kohm resistor to VCC and a 3300 pF capacitor to
ground to obtain the nominal switching frequency of 26.5 kHz.
14
13
24
C2
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
(0.450 / 2.5) • VR1, i.e. 450 mV at VR1 = 2.5 V.
15
16
17
14
15
16
25
26
27
VR2
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.”
CD2
Phase2 Controls the direction of motor current at outputs MA2 and MB2. Motor current flows from MA2
to MB2 when Phase2 is HIGH.
20
21
22
23
19
20
21
22
4
5
6
7
MA2
VMM2
E2
Motor output A, channel 2. Motor current flows from MA2 to MB2 when Phase2 is HIGH.
Motor supply voltage, channel 2, 10 to 40 V. VMM1 and VMM2 should be connected together.
Common emitter, channel 2. This pin connects to a sensing resistor to ground.
Motor output B, channel 2. Motor current flows from MA2 to MB2 when Phase2 is HIGH.
MB2
4
ERICSSON [ ERICSSON ]
