Allegro Manuals

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

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.

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

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’).

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.

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.

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.

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

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.

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.

A3950DS A3950 DMOS Full-Bridge Motor Driver is a product designed for PWM (pulse width modulation) control of DC motors, capable of peak output currents of ±2.8 A and operating voltages of 36 V. PHASE and ENABLE input terminals are provided for use in controlling the speed and direction of a DC motor with externally applied PWM control signals. Internal synchronous rectification control circuitry is provided to lower power dissipation during PWM operation. Internal circuit protection includes motor lead short-to-supply / short-to- ground, thermal shutdown with hysteresis, undervoltage monitoring of VBB and VCP, and crossover-current protection. A3950 is supplied in a thin profile (<1.2 mm overall height) 16-pin TSSOP package with exposed thermal pad (package LP). It is lead (Pb) free with 100% matte tin leadframe plating. Use the following complete part numbers when ordering:

The A3948SB/SLB is a Texas Instruments (TI) product designed for pulse-width modulated (PWM) current control of DC motors. It can output continuous current of 1.5A and operate at a voltage of 50V. There is a fixed dead zone time PWM current control timing circuit inside which can be programmed via a serial interface to operate in slow, fast, and mixed current decay modes. The A3958SB/SLB are similar devices with outputs rated to ±2A. The PHASE and ENABLE input terminals are provided for use in controlling the speed and direction of a DC motor with externally applied PWM-control signals. The ENABLE input can be programmed via the serial port to PWM the bridge in fast or slow current decay. Internal synchronous rectification control circuitry is provided to reduce power dissipation during PWM operation. Internal circuit protection includes thermal shutdown with hysteresis, and crossover-current protection. No special power-up sequencing is required. The A3948SB/SLB is available in a choice of two power packages, a 24-pin plastic DIP with a copper batwing tab (package suffix 'B') and a 24-lead plastic SOIC with a copper batwing tab (package suffix 'LB'). In both cases, the power tab is at ground potential and needs no electrical isolation.

The A3946 is designed specifically for applications that require high power unidirectional dc motors, three-phase brushless dc motors, or other inductive loads. The A3946 provides two high-current gate drive outputs that are capable of driving a wide range of power N-channel MOSFETs.

The A3940KLP / A3940KLW Full-Bridge Power MOSFET Controller is specifically designed for automotive applications that require high-power motors. Each provides four high-current gate drive outputs capable of driving a wide range of n-channel power MOSFETs in a full-bridge configuration. Bootstrap capacitors are utilized to provide the above-battery supply voltage required for n-channel FETs. An internal charge pump for the high side allows for dc (100% duty cycle) operation of the bridge. Protection features include supply under/overvoltage, thermal shutdown, and motor lead short-to-battery and short-to-ground fault notification, and a programmable dead-time adjustment for cross-conduction prevention. The overvoltage trip point is user adjustable. The A3940 is supplied in a choice of two power packages, a 28-pin TSSOP with an exposed thermal pad (package type LP), and a 28-pin wide-body SOIC (package type LW). Both package types are available in lead (Pb) free versions, with 100% matte-tin leadframe plating (suffix –T).