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NJM3774D2 Datasheet Preview

NJM3774D2 Datasheet

DUAL STEPPER MOTOR DRIVER

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NJM3774
DUAL STEPPER MOTOR DRIVER
s GENERAL DESCRIPTION
The NJM3774 is a switch-mode (chopper), constant-
current driver with two channels: one for each winding of a
two-phase stepper motor. The NJM3774 is equipped with a
TTL level compatible Disable input to simplify half-stepping
operation. The circuit is well suited for microstepping
applications together with the matching dual DAC
NJU39610. In full/half stepping applications, the NJM3517
can be used as a phase generator (translator) to derive the
necessary signals for the NJM3774. The NJM3774 con-
tains 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. Voltage
supply requirements are +5 V for logic and +10 to +45 V for
the motor. Maximum output current is 1000mA per channel.
s PACKAGE OUTLINE
NJM3774D2 NJM3774FM2
s FEATURES
• Dual chopper driver
• 1000 mA continuous output current per channel
• Specially matched to the Dual DAC NJU39610
• Packages DIP22 / PLCC28
s BLOCK DIAGRAM
Phase 1
Dis1 VR1
C1
NJM3774
VCC
V
CC
+
E1
RQ
S
Logic
+
RC
Logic
+
SQ
R
Figure 1. Block diagram
Phase 2
Dis 2 VR2
C2
GND
E2
M A1
M B1
VMM1
VMM2
M B2
M A2




New Japan Radio

NJM3774D2 Datasheet Preview

NJM3774D2 Datasheet

DUAL STEPPER MOTOR DRIVER

No Preview Available !

NJM3774
s PIN CONFIGURATIONS
VMM2 5
E2 6
M B2 7
M B1 8
GND 9
E1 10
VMM111
NJM3774FM2
25 VR2
24 C2
23 RC
22 VCC
21 C1
20 VR1
19 Phase1
RC 1
22 VCC
C2 2
21 C1
V R2 3
20 VR1
Phase 2 4
19 Phase1
GND 5
GND 6
Dis2 7
NJM
3774D2
18 GND
17 GND
16 Dis1
MA2 8
15 MA1
VMM2 9
14 VMM1
E2 10
MB2 11
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
MA2
5
9
VMM2
6
10
E2
7
11
MB2
8
12 M
B1
10 13 E1
11
14
VMM1
12 15 M
A1
18 16 Dis1
19 19 Phase
1
20
20
VR1
21 21 C1
22
22
VCC
23 1
RC
24 2
C2
25 3
26 4
27 7
V
R2
Phase2
Dis2
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 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 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 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 supply voltage, channel 1, +10 to +40 V. VMM1 and VMM2 should be connected together.
Motor output A, channel 1. Motor current flows from M to M when Phase is HIGH.
A1
B1
1
Disable input (TTL level compatible) for channel 1. 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
A1
B1
A1
B1
when Phase1 is HIGH.
Ref. 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 V = 0.18 • V [V], i.e. 450
CH1
R1
mV at VR1 = 2.5 V.
Logic voltage supply, nominally +5 V.
Clock oscillator RC pin. Connect a 15 kohm resistor to V and a 3300 pF capacitor to ground to obtain
CC
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.
Ref. voltage, channel 2. Controls the threshold voltage for the comparator and hence the output
current.
Controls the direction of motor current at outputs MA2 and MB2. Motor current flows from MA2 to MB2
when Phase2 is HIGH.
Disable input (TTL level compatible) for channel 2. When HIGH, all four output transistors are turned
off, which results in a rapidly decreasing output current to zero.


Part Number NJM3774D2
Description DUAL STEPPER MOTOR DRIVER
Maker New Japan Radio
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