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SLA7051M Datasheet(PDF) 1 Page - Allegro MicroSystems |
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SLA7051M Datasheet(HTML) 1 Page - Allegro MicroSystems |
1 / 12 page UNIPOLAR STEPPER-MOTOR TRANSLATOR/PWM DRIVER Combining low-power CMOS logic with high-current, high-voltage power FET outputs, the SLA7051M 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 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 2 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 torque- speed 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. The SLA7051M is supplied in an 18-pin single in-line power-tab package with leads formed for vertical mounting (suffix LF871) or horizontal mounting (suffix LF872). The tab is at ground potential and needs no insulation. For high-current or high-frequency applications, external heat sinking may be required. This device is rated for continu- ous operation between -20°C and +85°C. FEATURES 2 A Output Rating Internal Sequencer for Full or Half-Step Operation PWM Constant-Current Motor Drive Cost-Effective, Multi-Chip Solution 100 V, Avalanche-Rated NMOS Low r DS(on) NMOS Outputs (300 mΩ typical) Advanced, Improved Body Diodes Half-Step and Full-Step Unipolar Drive Inputs Compatible with 3.3 V or 5 V Control Signals Sleep Mode Internal Clamp Diodes Always order by complete part number, e.g., SLA7051MLF871 . ABSOLUTE MAXIMUM RATINGS Driver Supply Voltage, VBB ................ 46 V Load Supply Voltage, VM ................... 46 V Output Current, I O ........................... 2.0 A* Logic Supply Voltage, VDD ................ 7.0 V Logic Input Voltage Range, VI .......................... -0.3 V to VDD+ 0.3 V Sense Voltage, VS ........................ ±2.0 V† Reference Input Voltage Range, VREF .................................. -0.3 V to VDD+ 0.3 V Package Power Dissipation, PD ....................................... See Graph Junction Temperature, T J ............. +150°C Operating Temperature Range, T A ................................. -20°C to +85°C Storage Temperature Range, T S ............................... -30°C to +150°C * Output current rating may be limited by duty cycle, ambient temperature, and heat sinking. Under any set of conditions, do not exceed the specified current rating or junction temperature. † Internal filtering provides protection against transients during the first 1 µs of the current-sense pulse. SLA7051M Motor Driver Sanken Power Devices from Allegro MicroSystems |
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