NJM3772 데이터 시트보기 (PDF) - Japan Radio Corporation
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NJM3772 Datasheet PDF : 9 Pages
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s PIN CONFIGURATIONS
NJM3772
VBB2 5
E2 6
M B2 7
M B1 8
GND 9
E1 10
VBB1 11
NJM3772FM2
25 VR2
24 C2
23 RC
22 VCC
21 C1
20 VR1
19 Phase1
RC 1
C2 2
V R2 3
Phase 2 4
GND 5
GND 6
VMM2 7
MA2 8
VBB2 9
E2 10
MB2 11
NJM
3772D2
22 VCC
21 C1
20 VR1
19 Phase1
18 GND
17 GND
16 VMM1
15 MA1
14 VBB1
13 E1
12 MB1
Figure 2. Pin configurations
s PIN DESCRIPTION
PLCC DIP
Symbol
1-3, 9, 5, 6 GND
13-17 17, 18
28
4
8
M
A2
5
9
V
BB2
6
10
E2
7
11
MB2
8
12
MB1
10
13
E1
11 14 V
BB1
12
15
MA1
18
16
VMM1
19
19
Phase1
20 20 V
R1
21
21
C1
22
22
VCC
23 1
RC
24 2
C2
25 3
26 4
27 7
VR2
Phase
2
VMM2
Description
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.
Motor output A, channel 2. Motor current flows from M to M when Phase is HIGH.
A2
B2
2
Collector of upper output transistor, channel 2. For lowest possible power dissipation, connect a
series resistor RB2 to VMM2. See Applications information, External components.
Common emitter, channel 2. This pin connects to a sensing resistor RS to ground.
Motor output B, channel 2. Motor current flows from MA2 to MB2 when Phase2 is HIGH.
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 RS to ground.
Collector of upper output transistor, channel 1. For lowest possible power dissipation, connect a
series resistor RB1 to VMM1. See Applications information, External components.
Motor output A, channel 1. Motor current flows from MA1 to MB1 when Phase1 is HIGH.
Motor supply voltage, channel 1, +10 to +40 V. VMM1 and VMM2 should be connected together.
Controls the direction of motor current at outputs MA1 and MB1. Motor current flows from MA1 to MB1
when Phase1 is HIGH.
Reference voltage, channel 1. Controls the threshold voltage for the comparator and hence the
output current.
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 VCH1= 0.18 • VR1 [V],
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 VCH2= 0.18 • VR2 [V],
i.e. 450 mV at VR2 = 2.5 V.
Reference voltage, channel 2. Controls the threshold voltage for the comparator and hence the
output current.
Controls the direction of motor current at outputs M and M . Motor current flows from M to M
A2
B2
A2
B2
when Phase is HIGH.
2
Motor supply voltage, channel 2, +10 to +40 V.VMM1 and VMM2 should be connected together.
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