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NJM3773FM2 Datasheet Preview

NJM3773FM2 Datasheet

DUAL STEPPER MOTOR DRIVER

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DUAL STEPPER MOTOR DRIVER
NJM3773
s GENERAL DESCRIPTION
The NJM3773 is a switch-mode (chopper), constant-current
driver with two channels: one for each winding of a two-phase
stepper motor. The NJM3773 is also equipped with a Disable
input to simplify half-stepping operation. The circuit is well
suited for microstepping applications together with an external
micro controller. The current control inputs are low current,
high impedance inputs, which allows the use of unbuffered
DAC or external high resistive resistor divider network. The
NJM3773 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
NJM3773D2 NJM3773E3
NJM3773FM2
s FEATURES
• Dual chopper driver
• 750 mA continuous output current per channel
• High impedance current control inputs
• Digital filter on chip eliminates external filtering components
• Packages DIP22 / PLCC28 / EMP24(Batwing)
s BLOCK DIAGRAM
Phase 1
Dis1 VR1
C1
NJM3773
VCC
V
CC
+
E1
RQ
S
Logic
+
RC
Logic
+
SQ
R
M A1
M B1
VMM1
VMM2
M B2
M A2
Figure 1. Block diagram
Phase 2
Dis 2 VR2
C2
GND
E2




New Japan Radio

NJM3773FM2 Datasheet Preview

NJM3773FM2 Datasheet

DUAL STEPPER MOTOR DRIVER

No Preview Available !

s PIN CONFIGURATIONS
NJM3773
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
3773E3
24 NC
23 MB2
22 E2
21 MA2
20 VMM2
19 GND
18 GND
17 VR2
16 C2
15 Phase2
14 Dis2
13 Vcc
MB1 1
22 MB2
E1 2
MA1 3
21 E2
20 MA2
VMM1 4
19 VMM2
GND 5
GND 6
VR1 7
NJM
3773D2
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
MB1 8 NJM3773FM2
GND 9
E1 10
M A1 11
25 Phase2
24 Dis 2
23 VCC
22 RC
21 Dis 1
20 Phase1
19 C1
Figure 2. Pin configurations
s PIN DESCRIPTION
EMP
2
3
4
5
6,7
18,19
8
9
10
11
12
13
14
15
16
17
20
21
22
23
DIP
PLCC
1
8
2
10
3
11
4
12
5, 6, 1-3, 9,
17, 18 13-17,
28
7
18
8
19
9
20
10 21
11 22
12 23
13 24
14 25
15 26
16 27
19 4
20 5
21 6
22 7
Symbol Description
M
B1
E1
MA1
VMM1
GND
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.
VR1 Reference voltage, channel 1. Controls the comparator threshold voltage and hence the
output current.
C1
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.
Phase1 Controls the direction of motor current at outputs MA1 and MB1. Motor current flows from MA1
to M when Phase is HIGH.
B1
1
Dis Disable input for channel 1. When HIGH, all four output transistors are turned off, which
1
results in a rapidly decreasing output current to zero.
RC 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.
VCC Logic supply voltage, nominally +5 V.
Dis2 Disable input for channel 2. When HIGH, all four output transistors are turned off, which
results in a rapidly decreasing output current to zero.
Phase2 Controls the direction of motor current at outputs MA2 and MB2. Motor current flows from MA2
to MB2 when Phase2 is HIGH.
C2
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.
VR2 Reference voltage, channel 2. Controls the comparator threshold voltage and hence the
output current.
V
MM2
MA2
E2
MB2
Motor supply voltage, channel 2, +10 to +40 V.V and V should be connected together.
MM1
MM2
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 NJM3773FM2
Description DUAL STEPPER MOTOR DRIVER
Maker New Japan Radio
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