ALLEGRO Manuals

SLA7024M, SLA7026M, and SMA7029M are designed for high-efficiency and high-performance operation of 2-phase, unipolar stepper motors. The products are suitable for controlling and directly driving a broad range of 2-phase, unipolar stepper motors.

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The A2526EL/M and A2536EL/M are integrated high-side dual power switches, optimized for self-powered and bus-powered Universal Serial Bus (USB) applications. Few external components are necessary to satisfy USB requirements. Each switch channel supplies up to 500 mA as required by USB peripheral devices. In addition, the switch’s low on-resistance permits achieving the USB voltage-drop requirements. Fault current is limited to typically 750 mA, satisfying the UL 25 VA safety requirements, and a flag output is available to indicate a fault condition to the local USB controller. Momentary voltage drops that may occur on the upstream port when the switch is enabled in bus-powered applications is eliminated by a “soft start” feature. Additional features include thermal shutdown to prevent catastrophic switch failure from high-current loads, undervoltage lockout to ensure that the device remains OFF unless there is a valid input voltage present, and 3.3 V and 5 V logic-compatible enable inputs. These switches are provided in 8-pin mini-DIP (suffix ‘M’) and 8-lead SOIC (suffix ‘L’) packages.

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A2525EL/M and A2535EL/M are integrated high-side power switches, optimized for self-powered and bus-powered Universal Serial Bus (USB) applications

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A1391-DS is the datasheet of A1391 and A1392, it is a micro power 3V linear hall effect sensor with tri-state output and user-selectable sleep mode. This integrated circuit (IC) provides a voltage output that is directly proportional to an applied magnetic field. In many applications, it is difficult to achieve sufficient sensitivity levels with a Hall effect sensor IC without consuming more than 3 mA of current. The A1391 and A1392 minimize current consumption to less than 25 μA through the addition of a user-selectable sleep mode.

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A1373 and A1374 are high precision linear Hall effect sensors with external programmable features, which are produced by Allegro MicroSystems, Inc. It has extremely low offset and minimal temperature drift. It can be used in automotive and industrial linear position sensing applications that require increased reliability and accuracy over conventional contacting-potentiom- eter solutions.

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The A1373 and A1374 high precision linear Hall effect sensors are ideal for use in automotive and industrial linear position-sensing applications that require increased reliability and accuracy over conventional contacting-potentiom- eter solutions.

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The A1321/A1322/A1323 is a linear Hall-effect sensor from Allegro MicroSystems with a ratiometric rail-to-rail output proportional to the applied magnetic field. It is ideal for use in harsh environments in automotive and industrial linear and rotary position sensing systems.

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The A132X family of linear Hall-effect sensors are optimized, sensitive, and temperature-stable. These ratiometric Hall-effect sensors provide a voltage output that is proportional to the applied magnetic field. The A132X family has a quiescent output voltage that is 50% of the supply voltage and output sensitivity options of 2.5mV/G, 3.125mV/G, and 5mV/G. The features of this family of devices are ideal for use in the harsh environments found in automotive and industrial linear and rotary position sensing systems. Each device has a BiCMOS monolithic circuit which integrates a Hall element, improved temperature-compensating circuitry to reduce the intrinsic sensitivity variation with temperature.

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The A132X family of linear Hall-effect sensors are optimized, sensitive, and temperature-stable. These ratiometric Hall-effect sensors provide a voltage output that is proportional to the applied magnetic field. The A132X family has a quiescent output voltage that is 50% of the supply voltage and output sensitivity options of 2.5mV/G, 3.125mV/G, and 5mV/G. The features of this family of devices are ideal for use in the harsh environments found in automotive and industrial linear and rotary position sensing systems. Each device has a BiCMOS technology.

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The A1301 and A1302 are continuous-time, ratiometric, linear Hall-effect sensors. They are optimized to accurately provide a voltage output that is proportional to an applied magnetic field. These devices have a quiescent output voltage that is 50% of the supply voltage. Two output sensitivity options are provided: 2.5 mV/G typical for the A1301, and 1.3 mV/G typical for the A1302. The Hall-effect integrated circuit included in each device includes a Hall sensing element, a linear amplifier, and a CMOS Class A output structure. Integrating the Hall sensing element and the amplifier on a single chip minimizes many of the problems normally associated with low voltage level analog signals. High precision in output levels is obtained by internal gain and offset trim.

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A3985 is a dual full-bridge gate driver suitable for driving a wide range of higher power industrial bipolar 2- phase stepper motors or 2-phase brushless dc motors. It can also be used to drive two individual torque motors or solenoid actuators. Motor power is provided by external N-channel power MOSFETs at supply voltages from 12 to 50 V. Full digital control is provided by two serially-accessible registers that allow programming of off-time, blank-time, dead-time, mixed decay ratios, synchronous rectification, master clock source selection, and division ratio and idle mode. All internal timings are derived from a master clock that can be generated on-chip or provided by an external clock such as the system clock of the master controller. A programmable divider allows for a wide range of external system clock frequencies. The internal fixed off-time PWM current-control timing is programmed via the serial interface to operate in slow, fast, and mixed current-decay modes. The desired load-current level and direction is set via the serial port with a direction bit and two 6-bit linear DACs in conjunction with a reference voltage. The seven bits of control allow maximum flexibility in torque control

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A3983 DMOS Microstepping Driver

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A3982 DMOS Stepper Motor Driver with Translator

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A3980 is a complete microstepping motor driver with translator from Allegro company. It supports full-, half-, eighth-, and sixteenth-step modes, at up to 35 V and ±1 A. It also includes a fixed off-time current regulator which has the ability to operate in slow, fast, or mixed decay modes. This results in reduced audible motor noise, increased step accuracy, and reduced power dissipation.

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The A3979 is a complete microstepping motor driver with built-in translator, designed as a pin-compatible replacement for the successful A3977, with enhanced microstepping (1/16 step) precision.

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The A3979 is a complete microstepping motor driver with built-in translator, designed as a pin-compatible replacement for the successful A3977, with enhanced microstepping (1/16 step) precision. It is designed to operate bipolar stepper motors in full-, half-, quarter-, and sixteenth- step modes, with an output drive capacity of up to 35 V and ±2.5 A. The A3979 includes a fixed off-time current regulator that has the ability to operate in Slow, Fast, or Mixed decay modes. This current-decay control scheme results in reduced audible motor noise, increased step accuracy, and reduced power dissipation. The translator is the key to the easy implementation of the A3979. It allows the simple input of one pulse on the STEP pin to drive the motor one microstep, which can be either a full step, half, quarter, or sixteenth, depending on the setting of the MS1 and MS2 logic inputs. There are no phase-sequence tables, high-frequency control lines, or complex inter- faces to program. The A3979 interface is an ideal fit for applications where a complex microprocessor is unavailable or is overburdened. Internal synchronous-rectification control circuitry is provided to improve power dissipation during PWM operation. Internal circuit protection includes: thermal shutdown with hysteresis, UVLO (under- voltage lockout), and crossover-current protection. Special power-on sequencing is not required. The A3979 is supplied in a low-profile

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A3977xED and A3977xLP are complete microstepping motor drivers with built-in translator. They are designed to operate bipolar stepper motors in full-, half-, quarter-, and eighth-step modes, with output drive capability of 35 V and ±2.5 A.

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The A3974SED is a dual full-bridge PWM motor driver designed for pulse-width modulated (PWM) current control of two dc motors. It can output ±1.5 A current and operate at up to 50 V. The internal fixed off-time PWM current-control timing circuitry can be programmed via a serial interface to operate in slow, fast, and mixed current-decay modes. Independent ENABLE input terminals are provided for use in controlling the speed and torque of each dc motor with externally applied PWM control signals. Synchronous rectification circuitry allows the load current to flow through the low rDS(on) of the DMOS output driver during the current decay. This feature will eliminate the need for external clamp diodes in most applications, saving cost and external component count, while minimizing power dissipation. Internal circuit protection includes thermal shutdown with hysteresis, undervoltage monitoring of VDD and the charge pump, and crossover-current protection. Special power-up sequencing is not required. The A3974SED is supplied in a 44-lead plastic PLCC with four copper batwing tabs for maximum heat dissipation. The power tabs are at ground potential and need no electrical isola- tion.

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The A3973SB and A3973SLB are dual DMOS full-bridge micro-stepping PWM motor drivers designed for bipolar microstepping stepper motor pulse-width modulated (PWM) current control.

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