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PDF NJM3777 Data sheet ( Hoja de datos )
| Número de pieza | NJM3777 | |
| Descripción | DUAL STEPPER MOTOR DRIVER | |
| Fabricantes | New Japan Radio | |
| Logotipo |  |
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NJM3777
DUAL STEPPER MOTOR DRIVER
s GENERAL DESCRIPTION
The NJM3777 is a switch-mode (chopper), constant-current
driver with two channels: one for each winding of a two-phase
stepper motor. The NJM3777 is equipped with a Disable input
to simplify half-stepping operation. The NJM3777 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 900mA
per channel.
s PACKAGE OUTLINE
NJM3777E3
s FEATURES
• Dual chopper driver
• 900 mA continuous output current per channel
• Digital filter on chip eliminates external filtering components
• Package EMP24(Batwing)
s BLOCK DIAGRAM
NJM3777
Phase1
Dis1 VR1
C1
VCC VCC
–
+
E1
RQ
S
Logic
+
–
RC
Logic
+ SQ
R
–
Phase 2
Dis 2 VR2
C2
GND
E2
Figure 1. Block diagram
M A1
M B1
V MM1
VMM2
M B2
M A2
1 page  
NJM3777
s ELECTRICAL CHARACTERISTICS
Electrical characteristics over recommended operating conditions, unless otherwise noted. - 20°C ≤ Tj ≤ + 125°C.
Parameter
Symbol
Conditions
General
Supply current
Supply current
Total power dissipation
I
CC
I
CC
PD
Total power dissipation
PD
Thermal shutdown junction temperature
Turn-off delay
t
d
Logic Inputs
Logic HIGH input voltage
Logic LOW input voltage
Logic HIGH input current
Logic LOW input current
Analog Inputs
Threshold voltage
Input current
|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
VIH
VIL
IIH
I
IL
VCH
IA
VCdiff
fs
tb
Note 4.
Dis = Dis = HIGH.
12
VMM= 24 V, IM1= IM2= 650 mA.
Notes 2, 3, 4.
VMM= 24 V, IM1= 800 mA, IM2= 0 mA.
Notes 2, 3, 4.
dV /dt
C
≥
50
mV/µs,
IM = 100 mA. Note 3.
VI = 2.4 V
V = 0.4 V
I
VR= 5 V
VR= 5 V
I = 500 mA
M
VMM=41 V,Dis1= Dis2= HIGH.
IM = 500 mA
IM = 500 mA.
VMM=41 V, Dis1= Dis2= HIGH.
IM = 500 mA.
CT = 4 700 pF, RT = 12 kohm
CT = 4 700 pF. Note 3.
s THERMAL CHARACTERISTICS
Min
-
-
-
-
-
-
2.0
-
-
-0.2
480
-
-
-
-
-
-
-
-
21.5
-
Typ Max
85 99
7 10
2.9 3.4
2.3 2.7
160 -
1.1 2.0
--
- 0.6
- 20
-0.1 -
500 520
500 -
5 20
0.5 0.8
- 50
1.2 1.3
1.4 1.6
- 50
1.3 1.5
23.0 24.5
1.0 -
Unit
mA
mA
W
W
°C
µs
V
V
µA
mA
mV
µA
mV
V
µA
V
V
µA
V
kHz
µs
Parameter
Thermal resistance
Symbol
Rth
J-GND
RthJ-A
Note 2.
Conditions
Min Typ
- 13
- 42
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.
Max Unit
- °C/W
- °C/W
5 Page | ||
| Páginas | Total 10 Páginas | |
| PDF Descargar | [ Datasheet NJM3777.PDF ] | |
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