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New Japan Radio

NJM3770AFM2 Datasheet Preview

NJM3770AFM2 Datasheet

STEPPER MOTOR DRIVER

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NJM3770A
STEPPER MOTOR DRIVER
s GENERAL DESCRIPTION
NJM3770A is a stepper motor driver, which consists of a
LS-TTL compatible logic input stage, a current sensor, a
monostable multivibrator and a high power H-bridge output
stage. The NJM3770A is a high power version and pin-
compatible with the NJM3717.Two NJM3770A and a small
number of external components form a complete control
and drive unit stepper motor systems.
s EATURES
• Half-step and full-step operation
• Switched mode bipolar constant current drive
• Wide range of current control 5 -1800 mA
• Wide voltage range 10 - 45 V
• Thermal overload protection
• Packages DIP16 (Batwing) / PLCC28 / EMP20
s PACKAGE OUTLINE
NJM3770AD3
NJM3770AE2
NJM3770AFM2
s BLOCK DIAGRAM
Phase
I
1
I0
VR
GND
VCC
VMM
VMM
Schmitt
Trigger
Time
Delay
1
1
1
MA
MB
&&&&
1
1
+
+
+
Current Sensor
C
Output Stage
Monostable
toff = 0.69 • RT • CT
T
E
NJM3770A
Figure 1. Block diagram




New Japan Radio

NJM3770AFM2 Datasheet Preview

NJM3770AFM2 Datasheet

STEPPER MOTOR DRIVER

No Preview Available !

s PIN CONFIGURATIONS
NJM3770A
MB 1
T2
VMM 3
GND 4
GND 5
GND 6
GND 7
VCC 8
I1 9
Phase 10
NJM
3770AE2
20 E
19 MA
18 VMM
17 GND
16 GND
15 GND
14 GND
13 VR
12 C
11 I0
MB 1
16 E
T2
15 MA
VMM 3
GND 4
GND 5
NJM
3770AD3
14 VMM
13 GND
12 GND
VCC 6
I1 7
11 VR
10 C
Phase 8
9 I0
N/C 5
MA 6
N/C 7
E8
GND 9
MB 10
T 11
NJM
3770AFM2
25 N/C
24 VR
23 C
22 N/C
21 I 0
20 Phase
19 I1
Figure 2. Pin configurations
s PIN DESCRIPTION
EMP
DIP
1
1
2
2
PLCC
10
11
3
3,14
12,4
4-7,
14-18
4,5,
12,13
1-3,9,
13-17,28
8
6
18
9
7
19
10
8
20
11
9
21
12
10
23
13
11
24
19
15
6
20
16
8
Symbol
MB
T
VMM
GND
VCC
I1
Phase
I
0
C
VR
MA
E
Description
Motor output B, Motor current flows from MA to MB when Phase is high.
Clock oscillator. Timing pin connect a 56 kresistor and a 820 pF in
parallel between T and Ground.
Motor supply voltage, 10 to 40 V. Pin 3(12) and pin 14(4) should be wired to
gether.
Ground and negative supply. Note these pins are used for heatsinking.
Make sure that all ground pins are soldered onto a suitable large copper
ground plane for efficient heat sinking.
Logic voltage supply normally +5 V.
Logic input. It controls, together with the I0 input, the current level in the output
stage.
The controllable levels are fixed to 100, 60, 20, 0%.
Controls the direction of the motor current of MA and MB outputs.
Motor current flows from MA to MB when the phase input is high.
Logic input. It controls, together with the I input, the current level in the output
1
stage.
The controllable levels are fixed to 100, 60, 20, 0%.
Comparator input. This input senses the instantaneous voltage across the
sensing resistor, filtered through a RC Network.
Reference voltage. Controls the threshold voltage of the comparator and hence
the output current. Input resistance: typically 6.8 kΩ ± 20%.
Motor output A, Motor current flows from MA to MB when Phase is high.
Common emitter. Connect the Sense resistor between this pin and ground.


Part Number NJM3770AFM2
Description STEPPER MOTOR DRIVER
Maker New Japan Radio
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