The A is a complete microstepping motor driver, with built-in translator. The A 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 A

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Exposed Thermal Pad. Not to scale. The A is a complete microstepping motor driver with. It is designed to operate bipolar stepper. TheA includes. This current-decay control. The translator is the key to the easy implementation of the. Simply inputting one pulse on the STEPinput drives the. There are no phase-sequence tables,. The A interface is an ideal fit for applications where a. Internal synchronous-rectification control circuitry is provided.
Internal circuit protection includes thermal shutdown with. Special power-up sequencing is not required. The A is lead Pb. ADS, Rev. Pinout Diagram. April 25, Part Number. Load Supply Voltage. Logic Supply Voltage. Logic Input Voltage Range. Reference Voltage. Sense Voltage DC. V REF. Output Current. I OUT. Operating Ambient Temperature.
Maximum Junction Temperature. Storage Temperature. T J max. T stg. Output current rating may be limited by duty cycle, ambient. Under any set of conditions,. Range K. Range S. Package Thermal Resistance. Allegro MicroSystems. Manchester, NH U. Download A Datasheet. TheA 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 A Simply inputting one pulse on the STEPinput drives the motor one step two logic inputs determine if it is a full-, half-, quarter-, or eighth-step. There are no phase-sequence tables, high-frequency control lines, or complex interfaces to program. The A interface is an ideal fit for applications where a complex microprocessor is unavailable or overburdened.
Internal synchronous-rectification control circuitry is provided to improve power dissipation during PWM operation. Internal circuit protection includes thermal shutdown with hysteresis, undervoltage lockout UVLO , and crossover- current protection. Range K Range S Rating 35 7.
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A3977 Datasheet PDF

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A3977: Microstepping DMOS Driver with Translator

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