ALLEGRO Manuals

A3976 is a high performance dual H-bridge motor driver that can be used to drive bipolar stepper motors or to bidirectionally control 2 DC Motors. A3976 uses full digital control and has high drive capacity and high reliability. The device has multiple protections such as output current, voltage, temperature, etc., which are suitable for use in harsh automotive application environments.

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The A3972SB is a dual DMOS full-bridge micro-stepping PWM motor driver designed for pulse-width modulated (PWM) current control of bipolar microstepping stepper motors. It is capable of continuous output currents to ±1.5 A and operating voltages to 50 V. The driver features internal fixed off-time PWM current-control timing circuitry that can be programmed via a serial interface to operate in slow, fast, and mixed current-decay modes. The desired load-current level is set via the serial port with two 6-bit linear DACs in conjunction with a reference voltage. The six bits of control allow maximum flexibility in torque control for a variety of step methods, from microstepping to full-step drive. Load current is set in 1.56% increments of the maximum value. The driver also includes synchronous rectification circuitry, which allows the load current to flow through the low rDS(on) of the DMOS output driver during the current decay. This eliminates the need for external clamp diodes in most applications, saving cost and minimizing power dissipation. The driver features internal circuit protection, including thermal shutdown with hysteresis, transient-suppression diodes, and crossover-current protection. Special power-up sequencing is not required. The A3972SB is supplied in a 24-lead plastic DIP with a copper batwing power tab. The lead (Pb) free version has 100% matte tin leadframe plating.

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The A3972SB is a dual DMOS full-bridge micro-stepping PWM motor driver designed for pulse-width modulated (PWM) current control of bipolar microstepping stepper motors. It is capable of continuous output currents to ±1.5 A and operating voltages to 50 V.

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The A3968SA and A3968SLB are designed to bidirectionally control two dc motors. Each device includes two H-bridges capable of continuous output currents of ±650 mA and operating voltages to 30 V. Motor winding current can be controlled by the internal fixed-frequency, pulse-width modulated (PWM), current-control circuitry. The peak load current limit is set by the user’s selection of a reference voltage and current-sensing resistors. Except for package style and pinout, the two devices are identical. The fixed-frequency pulse duration is set by a user-selected external RC timing network. The capacitor in the RC timing network also determines a user-selectable blanking window that prevents false triggering of the PWM current-control circuitry during switching transitions. To reduce on-chip power dissipation, the H-bridge power outputs have been optimized for low saturation voltages. The sink drivers feature the Allegro® patented Satlington® output structure. The Satlington outputs combine the low voltage drop of a saturated transistor and the high peak current capability of a Darlington. For each bridge, the INPUTA and INPUTB terminals determine the load current polarity by enabling the appropriate source and sink driver pair. When a logic low is applied to both INPUTs of a bridge, the braking function is enabled. In brake mode, both source drivers are turned OFF and both sink drivers are turned ON, thereby dynamically braking.

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The A3968 is a dual full-bridge PWM motor driver with brake from Allegro. It can bidirectionally control two dc motors with output currents of ±650 mA and operating voltages to 30 V.

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The A3966SA and A3966SLB are designed to drive both windings of a two-phase bipolar stepper motor. Each device includes two H-bridges capable of continuous output currents of ±650 mA and operating voltages to 30 V. Motor winding current can be controlled by the internal fixed-frequency, pulse-width modulated (PWM), current-control circuitry. The peak load current limit is set by the user’s selection of a reference voltage and current-sensing resistors. Except for package style and pinout, the two devices are identical. The fixed-frequency pulse duration is set by a user-selected external RC timing network. The capacitor in the RC timing network also determines a user-selectable blanking window that prevents false triggering of the PWM current-control circuitry during switching transitions. To reduce on-chip power dissipation, the H-bridge power outputs have been optimized for low saturation voltages. The sink drivers feature the Allegro patented Satlington output structure. The Satlington outputs combine the low voltage drop of a saturated transistor and the high peak current capability of a Darlington. For each bridge, a PHASE input controls load-current polarity by selecting the appropriate source and sink driver pair. For each bridge, an ENABLE input, when held high, disables the output drivers. Special power-up sequencing is not required. Internal circuit protection includes thermal shutdown with hysteresis.

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The A3967SLB is a complete microstepping motor driver with built-in translator. It is designed to operate bipolar stepper motors in full-, half-, quarter-, and eighth-step modes, with output drive capability of 30 V and ±750 mA. The A3967SLB includes a fixed off-time current regulator that has the ability to operate in slow, fast, or mixed current-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 A3967SLB. By simply inputting one pulse on the STEP input the motor will take one step (full, half, quarter, or eighth depending on two logic inputs). There are no phase-sequence tables, high-fre

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The A3965 is a unique device within Allegro’s portfolio, typically fitting niche low-voltage, battery-driven stepper motor applications.

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The A3964SB and A3964SLB are designed for pulse-width modulated (PWM) current control of bipolar stepper motors, capable of continuous output currents to ±800 mA and operating voltages to 30 V. Internal fixed off-time PWM current-control circuitry can be used to regulate the maximum load current to a desired value. An internal precision voltage reference is provided to improve motor peak-current control accuracy. The peak load current limit is set by the user’s selection of an external resistor divider and current-sensing resistors. The fixed off-time pulse duration is set by user-selected external RC timing networks. The capacitor in the RC timing network also determines a user-selectable blanking window that prevents false triggering of the PWM current control circuitry during switching transitions. This eliminates the need for two external RC filter networks on the current-sensing comparator inputs. For each bridge, the PHASE input controls load current polarity by selecting the appropriate source and sink driver pair. For each bridge, the ENABLE input, when held high, disables the output drivers. Special power-up sequencing is not required. Internal circuit protection includes thermal shutdown with hysteresis, transient-suppression diodes, and crossover-current protection. The A3964SB is supplied in a 24-pin plastic DIP with copper heat sink tabs; A3964SLB is supplied

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The A3962SLB is a dual full-bridge PWM motor driver that provides continuous output currents of ±800mA and operating voltages up to 30V. The internal fixed off-time PWM current control circuitry can be used to regulate motor speed, and the internal reference voltage can be used to generate a fixed PWM duty cycle.

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The document describes the A3961S dual full-bridge PWM motor driver, which is designed for pulse-width modulated current control of bipolar stepper motors. It can provide continuous output currents up to ±800 mA and operating voltages up to 45 V. The internal fixed off-time PWM current-control circuitry can be used to regulate the maximum load current to a desired value. An internal precision voltage reference is provided to improve motor peak current control accuracy. The peak load current limit is set by the user's selection of an external resistor divider and current-sensing resistors. The fixed off-time pulse duration is set by user-selected external RC timing networks. The capacitor in the RC timing network also determines a user-selectable blanking window that prevents false triggering of the PWM current control circuitry during switching transitions. This eliminates the need for two external RC filter networks on the current-sensing comparator inputs. For each bridge, the PHASE input controls load current polarity by selecting the appropriate source and sink driver pair. For each bridge, the ENABLE input, when held high, disables the output drivers. Special power-up sequencing is not required. Internal circuit protection includes therm

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The 3959 DMOS FULL-BRIDGE PWM MOTOR DRIVER is a power integrated circuit produced by Allegro Semiconductor. This device supports ±3 A output current and 50 V operating voltage, and the internal fixed PWM current control timing circuit can be adjusted through control inputs to operate in slow, fast and mixed current decay modes. The PHASE and ENABLE input terminals are used to control the speed and direction of a dc motor with externally applied PWM-control signals. Internal synchronous rectification control circuitry is provided to reduce power dissipation during PWM operation. Internal circuit protection includes thermal shutdown with hysteresis, undervoltage monitoring of supply and charge pump, and crossover-current protection. No special power-up sequencing is required. The A3959SB/SLB/SLP is a choice of three power packages, a 24-pin plastic DIP with a copper batwing tab (package suffix ‘B’), a 24-lead plastic SOIC with a copper batwing tab (package suffix ‘LB’), and a thin (<1.2 mm) 28-lead plastic TSSOP with an exposed thermal pad (suffixed ‘T’).

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This data sheet introduces the features of A3958SB/SLB 3958 DMOS FULL-BRIDGE PWM MOTOR DRIVER, including the functions, performance, appearance and size of the product.

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This datasheet introduces the A3958SB and A3958SLB, which are two dc motor drivers. They can control the speed and direction of a dc motor through PWM pulse control. The maximum output current is ±2 A and the operating voltage is 50 V.

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The A3953SB/A3953SLB is a full-bridge PWM motor driver capable of bidirectional PWM current control. The internal fixed dead-time PWM current-control circuitry is optimized for low-voltage, low-power applications, providing fast response, high accuracy, and low-noise output.

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The A3953S is a full-bridge PWM motor driver with integrated current sense, fault protection, and thermal shutdown circuitry.

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A3952S is a full-bridge PWM motor driver with bidirectional pulse-width modulated current control. It is capable of continuous output currents to ±2 A and operating voltages to 50 V. Internal fixed off-time PWM current-control circuitry can be used to regulate the maximum load current to a desired value. The peak load current limit is set by the user’s selection of an input reference voltage and external sensing resistor. The fixed OFF-time pulse duration is set by a user-selected external RC timing network. Internal circuit protection includes thermal shutdown with hysteresis, transient suppression diodes, and crossover- current protection. Special power-up sequencing is not required. With the ENABLE input held low, the PHASE input controls load current polarity by selecting the appropriate source and sink driver pair. The MODE input determines whether the PWM current-control circuitry operates in a slow current-decay mode (only the selected sink driver switching) or in a fast current-decay mode (selected source and sink switching). A user-selectable blanking window prevents false triggering of the PWM current control circuitry. With the ENABLE input held high, all output drivers are disabled. A sleep mode is provided to reduce power consumption when inactive. When a logic low is applied to the BRAKE input, the braking function is enabled. This overrides ENABLE and PHASE to turn OFF both source drivers and turn ON both sink drivers.

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The A3951SB and A3951SW are products designed for bidirectional pulse-width modulated current control of inductive loads. They are capable of continuous output currents to ±2A and operating voltages to 50V. Internal fixed off-time PWM current-control circuitry can be used to regulate the maximum load current to a desired value. The peak load current limit is set by the user’s selection of an input reference voltage and external sensing resistor.

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