NJM3771 데이터 시트보기 (PDF) - Japan Radio Corporation
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NJM3771 Datasheet PDF : 9 Pages
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s PIN CONFIGURATIONS
NJM3771
NC 1
MB1 2
E1 3
MA1 4
VMM1 5
GND 6
GND 7
Phase1 8
CD1 9
VR1 10
C1 11
VCC 12
NJM
3771E3
24 NC
23 MB2
22 E2
21 MA2
20 VMM2
19 GND
18 GND
17 Phase2
16 CD2
15 VR2
14 C2
13 RC
MB1 1
22 MB2
E1 2
VMM1 3
21 E2
20 VMM2
MA1 4
19 MA2
GND 5
GND 6
Phase1 7
NJM
3771D2
18 GND
17 GND
16 Phase 2
CD1 8
15 CD2
VR1 9
14 VR2
C1 10
VCC 11
13 C2
12 RC
VMM2 5
E2 6
M B2 7
M B1 8
GND 9
E1 10
VMM1 11
NJM 3771FM2
25 VR2
24 C2
23 RC
22 VCC
21 C1
20 VR1
19 CD1
Figure 2. Pin configurations
s PIN DESCRIPTION
Refer to Figure 2
EMP
2
3
4
5
6,7,
18,19
8
9
10
11
12
13
14
15
16
17
20
21
22
23
DIP
1
2
3
4
5,6,
17,18
7
8
9
10
11
12
13
14
15
16
19
20
21
22
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
Symbol
M
B1
E1
V
MM1
M
A1
GND
Phase1
CD1
VR1
C1
VCC
RC
C2
V
R2
CD2
Phase2
MA2
VMM2
E2
MB2
Description
Motor output B, channel 1. Motor current flows from M to M when Phase is HIGH.
A1
B1
1
Common emitter, channel 1. This pin connects to a sensing resistor to ground.
Motor supply voltage, channel 1, 10 to 40 V. V and V should be connected together.
MM1
MM2
Motor output A, channel 1. Motor current flows from M to M when Phase is HIGH.
A1
B1
1
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 MA1 and MB1. Motor current flows from MA1
to MB1 when Phase1 is HIGH.
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.
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.
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) • V , i.e. 450 mV at V = 2.5 V.
R1
R1
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 MA2 and MB2. Motor current flows from MA2
to MB2 when Phase2 is HIGH.
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.
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