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PDF NJM3773 Data sheet ( Hoja de datos )
| Número de pieza | NJM3773 | |
| Descripción | DUAL STEPPER MOTOR DRIVER | |
| Fabricantes | New Japan Radio | |
| Logotipo |  |
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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
NJM3773
Phase 1
Dis1 VR1
C1
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
1 page  
NJM3773
s ELECTRICAL CHARACTERISTICS
Electrical characteristics over recommended operating conditions, unless otherwise noted. -20°C ≤ Tj ≤ +125°C.
Parameter
Symbol Conditions
Min
General
Supply current
Supply current
Total power dissipation
Total power dissipation
Thermal shutdown junction temperature
Turn-off delay
Logic Inputs
Logic HIGH input voltage
Logic LOW input voltage
Logic HIGH input current
Logic LOW input current
Analog Inputs
Input current
Threshold voltage
| VC1 - VC2 | mismatch
Motor Outputs
Lower transistor saturation voltage
Lower transistor leakage current
Lower diode forward voltage drop
Upper transistor saturation voltage
Upper transistor leakage current
Upper diode forward voltage drop
Chopper Oscillator
Chopping frequency
Digital filter blanking time
ICC
ICC
PD
P
D
td
V
IH
VIL
IIH
IIL
IA
V
C
VC,diff
fs
tb
VR=500mV. Note 4.
Dis1= Dis2= HIGH.
VMM= 24 V, IM1= IM2= 500 mA.
Notes 2, 3, 4.
V = 24 V, I = 700 mA, I = 0 mA.
MM M1
M2
Notes 2, 3, 4.
TA = +25°C, dVC/dt ≥ 50 mV/µs,
IM = 100 mA. Note 3. (one channel on).
VI = 2.4 V
VI = 0.4 V
V = 500mV
R
RB= 1 kohm. Note 3.
IM = 500 mA
VMM=41 V,TA = +25°C. Dis1= Dis2= HIGH.
IM = 500 mA
I = 500 mA.
M
VMM=41 V,TA = +25°C. Dis1= Dis2= HIGH..
IM = 500 mA.
CT = 4 700 pF, RT = 12 kohm
CT = 4 700 pF. Note 3.
-
-
-
-
-
-
2.0
-
-
-0.2
-0.5
-
-
-
-
-
-
-
-
21.5
-
s THERMAL CHARACTERISTICS
Typ
Max
Unit
55 70
7 10
2.0 2.3
1.7 2.0
160 -
1.1 2.0
mA
mA
W
W
°C
µs
--
- 0.6
- 20
-0.1 -
V
V
µA
mA
-0.2 -
500 -
1-
µA
mV
mV
0.4 0.8 V
- 100 µA
1.1 1.3 V
1.1 1.4 V
- 100 µA
1.1 1.4 V
23.0 24.5 kHz
1.0 -
µs
Parameter
Thermal resistance
Symbol Conditions
RthJ-GND
RthJ-A
RthJ-GND
RthJ-A
RthJ-GND
Rth
J-A
DIP package.
DIP package. Note 2.
PLCC package.
PLCC package. Note 2.
EMP package
EMP package
Min
Typ Max
Unit
- 11 - °C/W
- 40 - °C/W
- 9 - °C/W
- 35 - °C/W
- 13 - °C/W
- 42 - °C/W
Notes
1. All voltages are with respect to ground. Currents are positive into, negative out of specified terminal.
2. All ground pins soldered onto a 20 cm2 PCB copper area with free air convection, TA = +25°C.
3. Not covered by final test program.
4. Switching duty cycle D = 30%, fs = 23.0 kHz.
5 Page | ||
| Páginas | Total 9 Páginas | |
| PDF Descargar | [ Datasheet NJM3773.PDF ] | |
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