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New Japan Radio

NJM3771D2 Datasheet Preview

NJM3771D2 Datasheet

DUAL STEPPER MOTOR DRIVER

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NJM3771
DUAL STEPPER MOTOR DRIVER
GENERAL DESCRIPTION
The NJM3771 is a stepper motor driver, which circuit is
especially developed for use in microstepping applications
in conjunction with the matching dual DAC (Digital-to-
-Analog Converter) NJU39610.
The NJM3771 contains a clock oscillator, which is
common for both driver channels; a set of comparators and
flip-flops imple menting the switching control; and two
H-bridges with internal recirculation diodes. Voltage supply
requirements are +5 V for logic and +10 to +45 V for the
motor. Maximum output current is 650 mA per channel.
PACKAGE OUTLINE
NJM3771D2
( DIP22 )
NJM3771E3
( SOP24 )
FEATURES
Dual chopper driver
650mA output current per channel
Selectable slow / fast current decay for improved high-
speed microstepping
Specially matched to Dual DAC NJU39610
Packages
DIP22-D2 / PLCC28-M2
SOP24 JEDEC 300 mil (Batwing)
NJM3771FM2
( PLCC28 )
BLOCK DIAGRAM
Figure 1. Block diagram
Ver.2011-12-08
-1-




New Japan Radio

NJM3771D2 Datasheet Preview

NJM3771D2 Datasheet

DUAL STEPPER MOTOR DRIVER

No Preview Available !

NJM3771
PIN CONFIGURATION
Figure 2. Pin configurations
PIN DESCRIPTION
Refer to Figure 2.
SOP
DIP
PLCC
2
1
8
3
2
10
4
3
11
5
4
12
6, 7,
18,19
5, 6,
1-3, 9,
17, 18 13-17, 28
Symbol
MB1
E1
VMM1
MA1
GND
8
7
18
Phase1
9
8
19
CD1
10
9
20
VR1
11
10
21
C1
12
11
22
VCC
13
12
23
RC
14
13
24
C2
15
14
25
VR2
16
15
26
CD2
17
16
27
Phase2
20
19
21
20
4
MA2
5
VMM2
22
21
23
22
6
E2
7
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 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 MA1 to MB1 when Phase1 is HIGH.
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.
Controls the direction of motor current at outputs MA1 and MB1. Motor current flows from MA1
to MB1 when Phase1 is HIGH.
Current decay control, channel 1. A logic HIGH on this input results in slow current decay, a
LOW results in fast current decay, see “Functional Description”
Reference voltage, channel 1. Controls the threshold voltage for the comparator and hence
the output current. input resistance is typically 2.5kohms, ±20%.
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 (0.450 / 2.5)ŋ
VR1, i.e. 450mV at VR1=2.5V.
Logic voltage supply, nominally +5 V.
Clock oscillator RC pin. Connect a 15 kohm resistor to VCC and a 3 300 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 (0.450 / 2.5)ŋ
VR1, i.e. 450mV at VR1=2.5V.
Reference voltage, channel 2. Controls the threshold voltage for the comparator and hence
the output current. input resistance is typically 2.5kohms, ±20%.
Current decay control, channel 1. A logic HIGH on this input results in slow current decay, a
LOW results in fast current decay, see “Functional Description”
Controls the direction of motor current at outputs MA2 and MB2. Motor current flows from MA2
to MB2 when Phase2 is HIGH.
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 to ground.
Motor output B, channel 2. Motor current flows from MA2 to MB2 when Phase2 is HIGH.
-2-
Ver.2011-12-08


Part Number NJM3771D2
Description DUAL STEPPER MOTOR DRIVER
Maker New Japan Radio
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