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PDF NJM3717 Data sheet ( Hoja de datos )

Número de pieza NJM3717
Descripción STEPPER MOTOR DRIVER
Fabricantes New Japan Radio 
Logotipo New Japan Radio Logotipo



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No Preview Available ! NJM3717 Hoja de datos, Descripción, Manual

NJM3717
STEPPER MOTOR DRIVER
s GENERAL DESCRIPTION
NJM3717 is a stepper motor diver, which consists of a LS-TTL
compatible logic input stage, a current sensor, a monostable
multivibrator and a high power H-bridge output stage with built-in
protection diodes.
The output current is up to 1200mA. Two NJM3717 and a small
number of external components form a complete control and drive
unit for stepper motor systems.
s PACKAGE OUTLINE
NJM3717D2
NJM3717E2
s FEATURES
• Half-step and full-step modes
• Switched mode bipolar constant current drive
• Wide range of current control 5 - 1200 mA
• Wide voltage range 10 - 50 V
• Thermal overload protection
• Packages DIP16 / PLCC28 / EMP20
s BLOCK DIAGRAM
NJM3717FM2
Phase
I1
I0
VR
GND
VCC
Schmitt
Trigger
Time
Delay
1
1
VMM
VMM
1
&&&&
+
+
+
Current Sensor
1 1
Output Stage
Monostable
toff
= 0.69 • R • C
TT
TE
NJM3717
MA
MB
Figure 1. Block diagram

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NJM3717 pdf
200 mA/div
1 ms/div
21
NJM3717
0
100µs/div
Figure 4. Motor current (I ),
M
Vertical : 200 mA/div, Horizontal: 1
ms/div, expanded part 100 µs/div
3
Motor Current
RS
12
3
Fast Current Decay
Slow Current Decay
Time
Figure 5. Output stage with current
paths for fast and slow current decay
Phase shift here
gives fast
current decay
I 0A
I 1A
Ph A
Ph B
I 0B
I 1B
I MA
100%
60%
–20%
–60%
–100%
I MB
100%
60%
20%
–60%
–100%
Full step position
Half step position
Stand by mode
at 20 %
Half step mode at 100 %
Phase shift here
gives slow
current decay
Figure 6. Principal operating sequence
Full step mode at 60 %

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