Overview
The LV8729VGEVB is a development board featuring the LV8729V, a single-channel PWM current-controlled microstep bipolar stepper motor driver produced by Onsemi. This driver is designed to handle stepper motors with precision and reliability, making it suitable for applications requiring steady, quiet, and precise motor operation.
The LV8729V driver supports various microstepping modes and offers advanced features such as over-current protection, thermal shutdown, and forward/reverse control. It operates within a voltage range of 6V to 36V, with a proposed operating voltage of 12V, and can drive motors with currents up to 1.5A.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Model | LV8729V | - |
| Dimensions | 1.5mm * 2.0mm | - |
| Maximum Drive Current | 1.5A (Default 0.8A) | A |
| Operating Voltage | 6V-36V (Proposed 12V) | V |
| Support Subdivisions | 1, ½, ¼, ⅛, 1/16, 1/32, 1/64, 1/128 | - |
| Output On-resistance | Upper side: 0.35Ω, Lower side: 0.3Ω (Total: 0.65Ω at Ta = 25°C, IO = 1.8A) | Ω |
| Excitation Modes | 2-phase, 1-2 phase, W1-2 phase, 2W1-2 phase, 4W1-2 phase, 8W1-2 phase, 16W1-2 phase, 32W1-2 phase | - |
| Thermal Shutdown Temperature | 150°C to 200°C | °C |
| Thermal Hysteresis Width | 40°C | °C |
Key Features
- PWM Current Control: The LV8729V features PWM current control for precise motor current regulation.
- Microstepping Capabilities: Supports microstepping up to 1/128 steps, allowing for smooth and quiet motor operation.
- Over-Current Protection: Includes over-current protection circuit to prevent damage to the motor and driver.
- Thermal Shutdown: Thermal shutdown circuit to protect against overheating.
- Forward/Reverse Control: Allows for easy switching between clockwise and counter-clockwise motor rotation.
- Output Short-Circuit Protection: Built-in output short-circuit protection to prevent IC damage.
- Adjustable Current Limit: Current limits can be adjusted using the VREF input and current sense resistors.
- BiCDMOS Process IC: Utilizes BiCDMOS process for efficient operation.
Applications
The LV8729VGEVB is suitable for a variety of applications requiring precise stepper motor control, including:
- 3D Printers and CNC Machines: For accurate and quiet motor operation in precision manufacturing.
- Robotics and Automation: For controlling stepper motors in robotic arms and automated systems.
- Medical Devices: Where precise motor control is critical for medical equipment.
- Astronomy and Telescopes: For precise motor control in telescope positioning systems.
Q & A
- What is the maximum drive current of the LV8729V driver?
The maximum drive current of the LV8729V driver is 1.5A, with a default setting of 0.8A.
- What is the operating voltage range of the LV8729V driver?
The operating voltage range is from 6V to 36V, with a proposed operating voltage of 12V.
- What microstepping modes does the LV8729V support?
The LV8729V supports microstepping up to 1/128 steps.
- Does the LV8729V have over-current protection?
Yes, the LV8729V includes an over-current protection circuit to prevent damage to the motor and driver.
- How is the current limit adjusted on the LV8729V?
The current limit can be adjusted by measuring the VREF and using the current sense resistors. The current limit is calculated as VREF x 2.
- What is the thermal shutdown temperature of the LV8729V?
The thermal shutdown temperature ranges from 150°C to 200°C.
- Can the LV8729V be used with motors operating at lower voltages than specified?
Yes, the LV8729V can be used with motors operating at lower voltages (e.g., 2.8V to 5.5V) by adjusting the VREF to limit power delivery to what the motor can handle.
- Does the LV8729V have forward/reverse control?
Yes, the LV8729V allows for easy switching between clockwise and counter-clockwise motor rotation using the FR pin.
- What is the purpose of the VREF input on the LV8729V?
The VREF input is used for constant-current control, allowing the user to set the desired motor current.
- How does the output short-circuit protection work on the LV8729V?
The output short-circuit protection circuit detects short circuits and turns the output off temporarily to prevent damage. If the short circuit persists, the output remains off and the EMO output is activated.
