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DATASHEET PDF7050.pdf

¡öGeneral Description                                          
Combining low-power CMOS logic with high-current, high-voltage
power FET outputs, the Series SLA705xM translator/driver provides
complete control and drive for a two-phase unipolar stepper motor
with internal fixed off time, pulse-width modulation (PWM) control
of the output current in a power multi-chip module (PMCM?).
The CMOS logic section provides the sequencing logic, direction,
full/half-step control, synchronous/asynchronous PWM operation,
and a "sleep" function. The minimum CLOCK input is an ideal fit
for applications where a complex ¦ÌP 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 1,2 or 3 A and withstanding 46 V in the off
state. Ground-clamp and flyback diodes provide protection against
inductive transients. Special power-up sequencing is not required.
Full-step (2 phase) and half-step operation are externally selectable.
Two-phase drive energizes two adjacent phases in each detent
position (AB-BC-CD-DA). This sequence mode offers an improved
torquespeed product, greater detent torque, and is less susceptable to
motor resonance. Half-step excitation alternates between the
one-phase and two-phase modes (A-AB-B-BC-C-CD D-DA),
providing an eight-step sequence.
¡öApplications                                                    
¡ñPPC
¡ñPrinter
¡ñOA Equipment
¡öFeatures                                                          
¡ñTo 3A Output Rating
¡ñInternal Sequencer for Full or Half-Step Operation
¡ñPWM Constant-Current Motor Drive
¡ñCost-Effective, Multi-Chip Solution
¡ñ100 V, Avalanche-Rated NMOS
¡ñLow rDS(on) NMOS Outputs (300 milli-ohms typical)
¡ñAdvanced, Improved Body Diodes
¡ñHalf-Step and Full-Step Unipolar Drive
¡ñInputs Compatible with 3.3 V or 5 V Control Signals
¡ñSleep Mode
¡ñInternal Clamp Diodes
¡öKey Specifications                                                
¡ñMotor Supply Voltage (VM)£º44V max
¡ñLoad Supply Voltage (Vs)£º10V¡«44V
¡ñLogic Supply Voltage (Vcc)£º3V¡«5.5V
¡ñOutput Current (Io)£º1A(SLA7050M)
 2A(SLA7051M)
 3A(SLA7052M)
¡ñOutput Maximum Voltage (VDSS)£º100V min