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PDF SLA7083M Data sheet ( Hoja de datos )
| Número de pieza | SLA7083M | |
| Descripción | Unipolar 2-Phase Stepping Motor Driver ICs | |
| Fabricantes | Allegro Micro Systems | |
| Logotipo |  |
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SLA7080M Series
Unipolar 2-Phase Stepping Motor Driver ICs
Features and Benefits
▪ Power supply voltage, VBB, 46 V maximum; 10 to 44 V
normal operating range
▪ Logic supply voltage, VDD, 3 to 5.5 V
▪ Four output currents, IO(max) , options: 1, 1.5, 2, and 3 A
▪ Stepping control for phase input (full or half step)
▪ Built-in sense resistor detects motor current
▪ Compact ZIP 23-pin molded package (SLA package)
▪ Self-excitation PWM control with fixed off-time
▪ Built-in synchronous rectifying circuit reduces losses at
PWM-off
▪ Synchronous PWM function prevents noise generation in
motor Hold mode
▪ Sleep function reduces power consumption of drivers in
Standby mode
▪ Protection circuit detects motor coil open/short and
prevents overheating due to avalanche breakdown
▪ Externally-adjustable (3.2 μs /5.2 μs) blanking time
(minimum on-time)
Package: 23-pin ZIP (type SLA)
Description
This document describes the function and features of SLA7080M
series, which are unipolar 2-phase stepping motor driver ICs.
Four levels of output current are available from the incorporated
MOSFETs, corresponding to the rated output current ratings.
All current ratings are available with protection against motor
coil shorts or motor open wire detection.
The SLA7080M series has a multichip structure, for enhanced
thermal dispersion.The Control IC (MIC), four power elements
(MOSFET), and dual sense resistors, are all separate ICs.
Built-in sense resistors for each phase allow accurate track-
ing of performance without additional external components.
Low-power sleep mode as well as reduced power during PWM
off-time maximize energy savings.
Not to scale
Functional Block Diagram
28610.23
SENSEA
Rs
MIC
Pre-
Driver
Protect
Logic Block
Reg.
Pre-
Driver
Protect
+
C- omp
OSC
PWM
Control
Synchro
Control
PWM
Control
+
Com-p
OSC
SYNC GND
SENSEB
Rs
1 page  
SLA7080Mwww.DataSheet4U.com
Series
Unipolar 2-Phase Stepping Motor Driver ICs
1.4
1.2
SLA7080MPR
MOSFET VDS(on)
vs. Case
Temperature
1.0
0.8
0.6
0.4
0.2
0
–25
1.4
1.2
SLA7082MPR
MOSFET VDS(on)
vs. Case
Temperature
1.0
0.8
0.6
0.4
0.2
0
–25
1.1
Performance Characteristics at TA = 25°C
1.4
1.2
IO = 1 A
IO = 0.5 A
SLA7081MPR
MOSFET VDS(on)
vs. Case
Temperature
1.0
0.8
0.6
0.4
0.2
0 25 50 75 100 125
TC (°C)
0
–25 0
1.4
1.2
IO = 2 A
SLA7083MPR
MOSFET VDS(on)
vs. Case
Temperature
1.0
0.8
0.6
0.4
IO = 1 A
0 25 50 75 100 125
TC (°C)
0.2
0
–25
1.1
0
IO = 1.5 A
IO = 1 A
25 50 75 100 125
TC (°C)
IO = 3 A
IO = 2 A
IO = 1 A
25 50 75 100 125
TC (°C)
SLA7080MPR
MOSFET
Body Diode
Vf vs. Case
Temperature
1.0
0.9
0.8
0.7
IO = 1 A
IO = 0.5 A
SLA7081MPR
MOSFET
Body Diode
Vf vs. Case
Temperature
1.0
0.9
0.8
0.7
IO = 1.5 A
IO = 1 A
0.6
–25
1.1
0
25 50 75 100 125
TC (°C)
SLA7082MPR
MOSFET
Body Diode
Vf vs. Case
Temperature
1.0
0.9
0.8
0.7
IO = 2 A
IO = 1 A
SLA7083MPR
MOSFET
Body Diode
Vf vs. Case
Temperature
0.6
–25
1.1
0
1.0
0.9
0.8
0.7
25 50 75 100 125
TC (°C)
IO = 3 A
IO = 2 A
IO = 1 A
0.6
–25
0
25 50 75 100 125
TC (°C)
0.6
–25
0
Allegro MicroSystems, Inc.
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
25 50 75 100 125
TC (°C)
5
5 Page 
SLA7080Mwww.DataSheet4U.com
Series
Unipolar 2-Phase Stepping Motor Driver ICs
The resistance value of the incorporated resistors varies accord-
ing to the rated currents.
Rated Current
(A)
1
1.5
2
3
Detected Resistance Value
(Ω Typical)
0.305
0.305
0.205
0.155
Each resistance value shown above includes the inherent resis-
tance (approximately 5 mΩ) in the SLA7080M due to product
structure.
In particular, be cautious about noise on the VDD line. When
the noise on VDD line exceeds 0.5 V, device malfunction may
be caused. To avoid this, special attention should be paid to the
layout of the ground circuits. The separation of the VDD ground
and the VBB ground from the product GND pin is effective in
reducing the noise.
Clocking Switch Signals
In normal operation, the input signal for switching is received
from an external microcomputer into the INx pins. However, in
an application where the signal cannot be input, for example, due
to the limitation of ports, this function can be performed using the
following method. Refer to figure 11, which illustrates a topol-
ogy for a synchronization signal generation circuit that uses clock
signals.
When a logic high level signal is input to the circuit, the capacitor
in the circuit is charged and the SYNC signal is set to logic low
level in the SLA7080M.
When the clock signal is stopped at low level, the capacitor is dis-
charged by the resistor and the SYNC signal is set to logic high,
causing the SLA7080M to shift to the synchronous mode.
The RC time constant should be determined by the minimum
clock frequency used. In the case of a sequence that keeps the
clock input signal at logic high, an inverter circuit must be added.
Setting Motor Currents for Constant Running
In the SLA7080M series the motor current level, IO , is deter-
mined by the internal sense resistors, RS, and the values selected
for the external components R1 and R2 (see figure 12).
Io is calculated by the following formulas:
VREF
=
R1
R2 + R2
× VDD
,
(2)
IO =
VREF
RS
.
(3)
If VREF is set below 0.04 V, the accuracy of IO setting is highly
likely to be degraded due to the variation between individual
devices and the impedance of the application trace layout.
Lower Limit of Motor Current Control
The SLA7080M series uses a self-excitation PWM current con-
trol system with the fixed PWM off-time, toff. When the energy
stored in the motor coil is dissipated in less than toff , the coil
current flows as an intermittent current as shown in figure 13.
That is to say, the PWM average current is decreased and the
motor torque is lowered. When the current begins to flow in the
coil intermittently, this state is considered the lower limit of the
current control, IO(min).
VDD SLA7080MPR
ESD
protection
FLAG
Phase
VCC
SYNC
74HC14
SLA7080M
Figure 10. FLAG pin equivalent circuit
Figure 11. External circuit for detecting phase control signals
Allegro MicroSystems, Inc.
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
11
11 Page | ||
| Páginas | Total 20 Páginas | |
| PDF Descargar | [ Datasheet SLA7083M.PDF ] | |
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