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New Japan Radio

NJM3777E3 Datasheet Preview

NJM3777E3 Datasheet

DUAL STEPPER MOTOR DRIVER

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NJM3777
DUAL STEPPER MOTOR DRIVER
s GENERAL DESCRIPTION
The NJM3777 is a switch-mode (chopper), constant-current
driver with two channels: one for each winding of a two-phase
stepper motor. The NJM3777 is equipped with a Disable input
to simplify half-stepping operation. The NJM3777 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 900mA
per channel.
s PACKAGE OUTLINE
NJM3777E3
s FEATURES
• Dual chopper driver
• 900 mA continuous output current per channel
• Digital filter on chip eliminates external filtering components
• Package EMP24(Batwing)
s BLOCK DIAGRAM
Phase1
Dis1 VR1
C1
NJM3777
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
V MM1
VMM2
M B2
M A2




New Japan Radio

NJM3777E3 Datasheet Preview

NJM3777E3 Datasheet

DUAL STEPPER MOTOR DRIVER

No Preview Available !

s PIN CONFIGURATION
NJM3777
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
3777E3
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 configuration
s PIN DESCRIPTION
EMP
1
2
3
4
5
6, 7,
18, 19
8
9
10
11
12
13
14
15
16
17
20
21
22
23
24
Symbol
NC
M
B1
E1
MA1
VMM1
GND
VR1
C1
Phase1
Dis
1
RC
VCC
Dis2
Phase
2
C2
VR2
VMM2
M
A2
E
2
MB2
NC
Description
Not connected
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 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 MA1 and MB1. Motor current flows from MA1 to 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 1.0 µs.
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 M and M . Motor current flows from M to M when
A2
B2
A2
B2
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 M to M when Phase is HIGH.
A2
B2
2
Common emitter, channel 2. This pin connects to a sensing resistor R to ground.
S
Motor output B, channel 2. Motor current flows from MA2 to MB2 when Phase2 is HIGH.
Not connected


Part Number NJM3777E3
Description DUAL STEPPER MOTOR DRIVER
Maker New Japan Radio
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