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New Japan Radio

NJM3775D2 Datasheet Preview

NJM3775D2 Datasheet

DUAL STEPPER MOTOR DRIVER

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NJM3775
DUAL STEPPER MOTOR DRIVER
s GENERAL DESCRIPTION
The NJM3775 is a switch-mode (chopper), constant-
current driver with two channels: one for each winding
of a two-phase stepper motor. NJM3775 is equipped
with a Disable input to simplify half-stepping operation.
The NJM3775 contains a clock oscillator, which is
common for both driver channels, a set of comparators
and flip-flops implementing the switching control, and
two output H-bridges, including recirculation diodes.
Voltage supply requirements are + 5 V for logic and +
10 to + 45 V for the motor. Maximum output current is
750mA per channel.
s PACKAGE OUTLINE
NJM3775D2 NJM3775E3
NJM3775FM2
s FEATURES
• Dual chopper driver
• 750 mA continuous output current per channel
• Digital filter on chip eliminates external filtering components
• Packages DIP22 / PLCC28 / EMP24(batwing)
s BLOCK DIAGRAM
Phase 1
Dis1 VR1
C1
NJM3775
VCC
VCC
+
E1
RQ
S
Logic
+
RC
Logic
+
SQ
R
Phase 2
Dis 2 VR2
C2
GND
E2
Figure 1. Block diagram
M A1
M B1
VMM1
VMM2
M B2
M A2




New Japan Radio

NJM3775D2 Datasheet Preview

NJM3775D2 Datasheet

DUAL STEPPER MOTOR DRIVER

No Preview Available !

s PIN CONFIGURATIONS
NC 1
MB1 2
E1 3
MA1 4
VMM1 5
GND 6
GND 7
VR1 8
C1 9
Phase1 10
Dis1 11
RC 12
NJM
3775E3
24 NC
23 MB2
22 E2
21 MA2
20 VMM2
19 GND
18 GND
17 VR2
16 C2
15 Phase2
14 Dis2
13 Vcc
Figure 2. Pin configurations
NJM3775
MB1 1
22 MB2
E1 2
MA1 3
21 E2
20 MA2
VMM1 4
19 VMM2
GND 5
GND 6
VR1 7
NJM
3775D2
18 GND
17 GND
16 V R2
C1 8
Phase1 9
15 C2
14 Phase 2
Dis1 10
13 Dis2
RC 11
12 VCC
MA2 5
E2 6
M B2 7
M B1 8
GND 9
E1 10
M A1 11
NJM3775FM2
25 Phase2
24 Dis 2
23 VCC
22 RC
21 Dis 1
20 Phase1
19 C1
s PIN DESCRIPTION
EMP DIP PLCC Symbol
2
1
[8]
MB1
3
2
[10] E1
4
3
[11]
MA1
5
4
[12]
VMM1
6,7 5, 6, [1-3, 9, GND
18,19 17, 18 13-17,
28]
8
7
[18]
VR1
9
8
[19] C1
10 9
[20] Phase
1
11 10 [21] Dis1
12 11 [22] RC
13 12 [23] V
CC
14 13 [24] Dis
2
15 14 [25] Phase2
16 15 [26] C2
17 16 [27] V
R2
20 19 [4]
21 20 [5]
22 21 [6]
23 22 [7]
VMM2
MA2
E2
MB2
Description
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.
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.
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.
Reference voltage, channel 1. Controls the comparator threshold voltage and hence the output
current.
Comparator input channel 1. This input senses the instantaneous voltage across the sensing
resistor, filtered by the internal digital filter or an optional external RC network.
Controls the direction of motor current at outputs M and M . Motor current flows from M to
A1
B1
A1
MB1 when Phase1 is HIGH.
Disable input for channel 1. When HIGH, all four output transistors are turned off, which results
in a rapidly decreasing output current to zero.
Clock oscillator RC pin. Connect a 12 kohm resistor to VCC and a 4 700 pF capacitor to ground
to obtain the nominal switching frequency of 23.0 kHz and a digital filter blanking time of 1.0µs.
Logic voltage supply, nominally +5 V.
Disable input for channel 2. When HIGH, all four output transistors are turned off, which results
in a rapidly decreasing output current to zero.
Controls the direction of motor current at outputs MA2 and MB2. Motor current flows from MA2 to
MB2 when Phase2 is HIGH.
Comparator input channel 2. This input senses the instantaneous voltage across the sensing
resistor, filtered by the internal digital filter or an optional external RC network.
Reference voltage, channel 2. Controls the comparator threshold voltage and hence the output
current.
Motor supply voltage, channel 2, +10 to +40 V. VMM1 and VMM2 should be connected together.
Motor output A, channel 2. Motor current flows from MA2 to MB2 when Phase2 is HIGH.
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.


Part Number NJM3775D2
Description DUAL STEPPER MOTOR DRIVER
Maker New Japan Radio
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