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PDF NJM3774 Data sheet ( Hoja de datos )
| Número de pieza | NJM3774 | |
| Descripción | DUAL STEPPER MOTOR DRIVER | |
| Fabricantes | New Japan Radio | |
| Logotipo |  |
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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
NJM3774
Phase 1
Dis1 VR1
C1
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
1 page  
NJM3774
s ELECTRICAL CHARACTERISTICS
Electrical characteristics over recommended operating conditions unless otherwise noted, - 20°C ≤ TJ ≤ +125°C.
Parameter
Symbol
Conditions
Min Typ Max
General
Supply current
Total power dissipation
ICC
P
D
Total power dissipation
PD
Thermal shutdown junction temperature
Turn-off delay
td
Logic Inputs
Logic HIGH input voltage
Logic LOW input voltage
Logic HIGH input current
Logic LOW input current
Comparator Inputs
Threshold voltage
| VCH1 - VCH2 | mismatch
Input current
Reference Inputs
Input resistance
Input current
Motor Outputs
Lower transistor saturation voltage
Lower transistor leakage current
Lower diode forward voltage drop
Upper transistor saturation voltage
Upper transistor leakage current
Chopper Oscillator
Chopping frequency
VIH
VIL
IIH
IIL
V
CH
VCH,diff
IC
RR
I
R
fs
Note 4.
V = 12 V, I = I = 750 mA.
MM M1 M2
Notes 2, 3, 4.
VMM = 12 V, IM1 = 1000 mA, IM2 = 0 mA.
Notes 2, 3, 4.
TA = +25°C, dVC/dt ≥ 50 mV/µs.
I = 100 mA. Note 3.
M
VI = 2.4 V
VI = 0.4 V
R = 1 kohm, V = 2.50 V
CR
RC = 1 kohm
TA = +25°C
V = 2.5 V
R
IM = 750 mA
VMM = 41 V, VE = VR = 0 V, VC = VCC
IM = 750 mA
IM = 750 mA.
V = 41 V, V = V = 0 V, V = V
MM
ER
C CC
CT = 3300 pF, RT = 15 kohm
- 60 75
- 2.6 2.9
- 2.6 2.9
- 160 -
- 1.4 2.0
2.0 -
-
- - 0.8
- - 20
-0.4 -
-
430 450 470
-1-
-10 -
1
-5-
- 0.5 1.0
- 0.6 0.9
- - 700
- 1.2 1.5
- 1.1 1.4
- - 700
25.0 26.5 28.0
Unit
mA
W
W
°C
µs
V
V
µA
mA
mV
mV
µA
kohm
mA
V
µA
V
V
µA
kHz
s THERMAL CHARACTERISTICS
Parameter
Thermal resistance
Symbol
Conditions
Rth DIP package.
J-GND
RthJ-A DIP package. Note 2.
RthJ-GND PLCC package.
RthJ-A PLCC package. Note 2.
Min
-
-
-
-
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%, f = 26.5 kHz.
s
Typ
11
40
9
35
Max Unit
- °C/W
- °C/W
- °C/W
- °C/W
5 Page | ||
| Páginas | Total 9 Páginas | |
| PDF Descargar | [ Datasheet NJM3774.PDF ] | |
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