ALLEGRO Manuals

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:

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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.

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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.

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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).

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The A3940KLP and A3940KLW are designed specifically 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- lead TSSOP with an exposed thermal pad (suffix LP), and a 28-lead wide-body SOIC (suffix LW).

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A3938 Three-Phase Power MOSFET Controller

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Designed for pulse-width modulated (PWM) current control of three-phase brushless dc motors, the A3936SED is capable of peak output currents to ± 3 A and operating voltages to 50 V. Internal fixed off-time PWM current-control timing circuitry can be configured to operate in slow-, fast- and mixed- decay modes. Internal synchronous rectification control circuitry is provided to improve power dissipation during PWM operation. Internal circuit protection includes thermal shutdown with hysteresis, and crossover current protection. Special power up sequencing is not required. The A3936 is supplied in a 44-pin plastic PLCC with a copper batwing tabs (suffix ‘ED’). The power tabs are at ground potential and need no electrical isolation. This device is also available in a lead-free version (100% matte tin leadframe).

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The A3935 is designed specifically for automotive applications that require high-power motors. It provides six high-current gate drive outputs capable of driving a wide range of n-channel power MOSFETs. The A3935 integrates a pulse-frequency modulated boost converter to create a constant supply voltage for driving the external MOSFETs. Bootstrap capacitors are utilized to provide the above battery supply voltage required for n-channel FETs. Direct control of each gate output is possible via six TTL-compatible inputs. A differential amplifier is integrated to allow accurate measurement of the current in the three-phase bridge. Diagnostic outputs can be continuously monitored to protect the driver from short-to-battery, short-to-supply, bridge-open, and battery under/overvoltage conditions. Additional protection features include dead-time, VDD undervoltage, and thermal shutdown. The A3935 is supplied in a choice of three packages, a 44-lead PLCC with copper batwing tabs (suffix ED), a 48-lead low profile QFP with exposed thermal pad (suffix JP), and a 36-lead 0.8 mm pitch SOIC (suffix LQ).

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A3932SEQ is a three-phase brushless DC motor controller, which supports 12-50V voltage, and has internal fixed off time PWM current control circuit, maximum current limit is set by input reference voltage and external sensing resistor. It also has optional synchronous rectification, 120-degree spacing Hall sensor commutation logic, MOSFET gate-source voltage monitor, bootstrap capacitor charging current monitor, undervoltage lockout, overcurrent protection and etc.

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The product is a digital gear tooth sensor with self-calibration function and 9-bit signal capture. It can provide zero-speed performance.

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ATS665LSG True Zero Speed, High Accuracy, Gear Tooth Sensor

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The ATS651LSH is a two-wire self-calibrating differential speed and direction sensor with vibration immunity produced by Allegro MicroSystems, Inc. It provides an easy-to-use solution for speed and direction sensing applications.

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ATS645LSH is a miniature gear tooth sensor from ATMEL that provides true zero-speed digital gear-tooth sensing in two-wire applications.

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The SI-3018LSA is a low-voltage, high-current 1.8 V linear regulator designed to meet the requirement for increased integration and reliability in low-voltage, high-current, linear regulator applications such as personal computers (PCs) and set-top boxes.

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ATS645 is a fully optimized differential digital gear tooth sensor with high reliability. Its features include internal current regulator, small mechanical size, air gap independent switchpoints, precise duty cycle signal, automatic gain control and offset adjustment, true zero-speed operation, etc.

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The ATS643 is an optimized combination of integrated circuit and magnet that provides a manufacturer-friendly solution for true zero-speed digital gear-tooth sen. The sensor features precise duty cycle accuracy, large operating air gaps, low power consumption and fast start-up time.

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The ATS642LSH is an optimized Hall effect sensing integrated circuit and magnet combination that provides a user-friendly solution for true zero-speed digital gear-tooth sensing in two-wire applications. The sensor consists of a single-shot molded plastic package that includes a samarium cobalt magnet, a pole piece, and a Hall effect IC that has been optimized to the magnetic circuit. This small package, with optimized two-wire leadframe, can be easily assembled and used in conjunction with a wide variety of gear shapes and sizes. The integrated circuit incorporates a dual element Hall effect sensor and signal processing engine, which provides high-precision, reliable gear tooth sensing.

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