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A3977SEDT
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A3977SEDT 數據表
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詳細說明
The A3977 is a complete microstepping motor driver, with builtin translator. It is 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. The A3977 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.Features and Benefits▪ ±2.5 A, 35 V output rating▪ Low rDS(on) outputs, 0.45 Ω source, 0.36 Ω sink typical▪ Automatic current decay mode detection/selection▪ 3.0 to 5.5 V logic supply voltage range▪ Mixed, fast, and slow current decay modes▪ Home output▪ Synchronous rectification for low power dissipation▪ Internal UVLO and thermal shutdown circuitry▪ Crossover-current protection
主要特徵
- ▪ ±2.5 A, 35 V output rating
- ▪ Low rDS(on) outputs, 0.45 Ω source, 0.36 Ω sink typical
- ▪ Automatic current decay mode detection/selection
- ▪ 3.0 to 5.5 V logic supply voltage range
- ▪ Mixed, fast, and slow current decay modes
- ▪ Home output
- ▪ Synchronous rectification for low power dissipation
- ▪ Internal UVLO and thermal shutdown circuitry
- ▪ Crossover-current protection
規格
以下是所選零件的基本參數，涉及零件的特性及其所屬類別。
| Manufacturer | ALEGRO | Product Category ! | Motor Drivers and Controllers |
常見問題解答
What is A3977SEDT?
The A3977SEDT is a microstepping motor driver integrated circuit designed by Allegro Microsystems. It is specifically designed for driving bipolar stepper motors in various applications, including robotics, automation, and CNC machines.
How Does A3977SEDT Work?
The A3977SEDT works by controlling the current flowing through the windings of a bipolar stepper motor in a microstepping fashion. It incorporates a chopper driver to regulate the current and provide smooth and precise motor movements. The device supports full-step, half-step, quarter-step, and eighth-step microstepping modes for optimal motor control.
How Many Pins does A3977SEDT have and What are the Functions of the Pinout Configuration?
The A3977SEDT is housed in a 24-pin SSOP (Shrink Small Outline Package) package. The pinout configuration includes:
- VREF: Reference voltage output for current sensing.
- 1B, 2B, 3B, 4B: Motor winding output pins.
- VCP, VS, VM: Power supply and motor voltage pins.
- 2A, 1A, 3A, 4A: Motor winding input pins.
- GS2, GS1, GS0: Microstepping mode selection pins.
- DECAY: Decay time control pin.
- ENABLE: Motor driver enable pin.
What are the Pros and Cons of A3977SEDT?
Pros:
- Microstepping Capability: Provides smooth and precise motor control through microstepping modes.
- Integrated Chopper Driver: Regulates current flow for efficient motor operation.
- Flexible Microstepping Modes: Supports multiple microstepping resolutions for customization.
- Thermal Shutdown Protection: Includes thermal shutdown circuitry for overtemperature protection.
- Wide Operating Voltage Range: Works with a wide range of motor and power supply voltages.
Cons:
- Complexity: Requires understanding of motor control concepts for optimal use.
- External Components: May need additional components such as heat sinks or current-sensing resistors for specific applications.
- Package Size: The 24-pin SSOP package may require proper PCB layout and thermal management.
Are There Any Equivalents/Alternatives to A3977SEDT for Recommendation?
- The DRV8825 from Texas Instruments is a comparable microstepping motor driver with similar features.
- Alternatives to the A3977SEDT include the A4988 from Allegro Microsystems and the L298N from STMicroelectronics.
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