2-Phase Unipolar Stepper Motor Driver

SLA707xM Series

February, 2006

.

Sanken Electric Co.,Ltd.

I03-004EA-060227

■General Description

Combining low-power CMOS logic with high-current, high-voltage

power FET outputs, the Series SLA707xM translator/drivers provide

complete control and drive for a two-phase unipolar stepper motor

with internal fixed off time and pulse-width modulation (PWM)

control of the output current in a power multi-chip module

(PMCM™).

There are no phase-sequence tables, high-frequency control lines, or

complex interfaces to program. The CMOS logic section provides the

sequencing logic, direction, control, synchronous/asynchronous PWM

operation, and a "sleep" function. The minimum CLOCK input is an

ideal fit for applications where a complex µP is unavailable or

overburdened. TTL or LSTTL may require the use of appropriate

pull-up resistors to ensure a proper input-logic high. For PWM current

control, the maximum output current is determined by the user's

selection of a reference voltage and sensing resistor. The NMOS

outputs are capable of sinking up to 1, 1.5, 2, or 3 A (depending on

device) and withstanding 46 V in the off state.

Clamp diodes provide protection against inductive transients. Special

power-up sequencing is not required.

Full-,and Half-step operation are externally selectable for the

SLA7070/71/72/73MR. Full-, Half-, quarter-, and eighth-, and

sixteenth-step operation are externally selectable for the

SLA7075/76/77/78MR.

Half-step excitation alternates between the one-phase and two-phase

modes (A-AB-B-AB-A-AB-BAB),providing an eight-step sequence.

■Applications

● PPC

● Printer

● OA Equipment

■Features

● To 3 A Output Rating

● Internal Sequencer for Microstepping Operation

● PWM Constant-Current Motor Drive

● Cost-Effective, Multi-Chip Solution

● 100 V, Avalanche-Rated NMOS Outputs

● Low RDS(on) NMOS Outputs (150 milliohms typical)

● Advanced, Improved Body Diodes

● Inputs Compatible with 3.3 V or 5 V Control Signals

● Sleep Mode

● Internal Clamp Diodes

■Key Specifications

● Motor Supply Voltage (VM): 44V max

● Load Supply Voltage (Vs): 10V to 44V

● Logic Supply Voltage (Vcc): 3V to 5.5V

● Output Current (Io): 1A(SLA7070MxRxx, SLA7075MxRxx)

1.5A(SLA7071MxRxx, SLA7076MxRxx)

2A(SLA7072MxRxx, SLA7077MxRxx)

3A(SLA7073MxRxx, SLA7078MxRxx)

The x represents P, W, or R according to the functions (See App Note).

Typical Connection

SLA707xMR

マイコン

等

VBB

OutA

OutA

OutB

OutB

VDD

Clock

Sync

CW/CCW

Ref/Sleep1

SenseB

SenseA

Gnd

r1

r2

Sleep

Q1

＋

＋

CA

CB

～

Vs=10V

44V

～

Vcc=3.0V

5.5V

ﾛｼﾞｯｸGnd

ﾊﾟﾜｰGnd

1点Gnd

Reset

M1

M2

M3

Mo

N.C.

C1

r3

C2

Logic Ground

Power Ground

Single Point

Ground

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