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SLA7078MPRT Datasheet

Unipolar 2-Phase Stepper Motor Driver

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Application Information
SLA7070MPRT Series Unipolar 2-Phase
Stepper Motor Driver ICs
General Description
This document describes the SLA7070MPRT series,
which are unipolar 2-phase stepping motor driver ICs. The
SLA7070MPRT series employs a clock input method as
a control signal input method, enabling full control of the
device operation using only a few signal lines, instead of
the conventional phase input method that requires about 10
signal lines. This allows simplification of the circuit design
and a reduced workload on the control microprocessor.
In addition, the SLA7070MPRT series is improved in its
reliability by preventing the IC from damage due to abnor-
mal conditions. For example, it has a flag output terminal
to signal that a protection circuit has operated. The series
also has a built-in protection circuitry against motor coil
opens/shorts and thermal shutdown protection as well.
All the SLA7070MPRT series ICs are compatible in their
pin layouts and interface specifications, allowing custom-
ers the flexibility of choosing the IC that is optimal for the
target equipment characteristics.
Features and Benefits
• Power supply voltages, VBB : 46 V (max.), 10 to 44 V
normal operating range
• Logic supply voltages, VDD : 3.0 to 5.5 V
• Maximum output currents: 1 A, 1.5 A, 2 A, 3 A
• Built-in sequencer
• Full-, half-, and microstepping available (microstepping
options are capable of full-, half-, quarter-, eighth-, and
sixteenth-stepping
Figure 1. SLA7070MPRT packages are fully molded ZIPs with an
exposed pad for heatsink mounting.
• Built-in sense resistor, RSInt
• All variants are pin-compatible for enhanced
design flexibility
• ZIP type 23-pin molded package (SLA package)
• Self-excitation PWM current control with fixed off-time
(microstepping options off-time adjusted automatically by
step reference current ratio; 3 levels)
• Built-in synchronous rectifying circuit reduces losses at
PWM-off
• Synchronous PWM chopping function prevents motor
noise in Hold mode
• Sleep mode for reducing the IC input current in
stand-by state
• Built-in protection circuitry against motor coil
opens/shorts and thermal shutdown protection options
Applications
• LBPs, PPCs, ATMs, industrial robots, and so forth
The SLA7070MPRT series product variants and optional features
Part Number
Stepping
Rate
Output Current
(IOUT)
(A)
Input Clock
Edge Detection
Standard
SLA7070MPRT
1
SLA7071MPRT
Full and
1.5
Rising (positive)
SLA7072MPRT
half step
2
edge
SLA7073MPRT
3
SLA7075MPRT
1
SLA7076MPRT
SLA7077MPRT
Microstep
1.5
2
Rising (positive)
edge
SLA7078MPRT
3
Blanking Time
(µs)
Standard
3.2
1.7
SLA7070MPRT-AN, Rev. 2.1
January 10, 2013
SANKEN ELECTRIC CO., LTD.
http://www.sanken-ele.co.jp/en/




Sanken

SLA7078MPRT Datasheet Preview

SLA7078MPRT Datasheet

Unipolar 2-Phase Stepper Motor Driver

No Preview Available !

Table of Contents
Specifications
3
Functional Block Diagrams
3
Pin Descriptions
3
Package Outline Drawing
5
Electrical Characteristics
6
Allowable Power Dissipation
10
Typical Application
11
Device Logic
12
Pin Logic and Timing
12
Common Input Pins
12
Monitor Output Pin
12
Logic Input Pins
13
Clock Edge Timing
13
Reset Release and Clock Input Timing
13
Logic Level Change
13
Stepping Sequence Diagrams
14
Motor Excitation Sequencing
21
Individual Circuit Descriptions
22
Monolithic IC (MIC)
22
Output MOSFET Chip
22
Sense Resistor
22
Functional Description
23
PWM Current Control
23
Blanking Time
23
PWM Off-Time
26
Protection Functions
27
Application Information
29
Motor Current Ratio Setting (R1, R2, RS)
29
Lower Limit of Control Current
29
Avalanche Energy
29
On-Off Sequence of Power Supply (VBB
and VDD)
30
Motor Supply Voltage (VM) and Main Power
Supply Voltage (VBB)
31
Internal Logic Circuits
31
Reset
31
Clock Input
31
Chopping Synchronous Circuit
31
Output Disable (Sleep1 and Sleep2) Circuits 31
Ref/Sleep1 Pin
32
Logic Input Pins
32
Thermal Design Information
32
Characteristic Data
34
SLA7070MPRT-AN, Rev. 2.1
2
SANKEN ELECTRIC CO., LTD.


Part Number SLA7078MPRT
Description Unipolar 2-Phase Stepper Motor Driver
Maker Sanken
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