BP6601
Integrated stepper motor driver with up to 1/16 microstepping and 2.5A peak current for precision motion control
Product Overview
Description
The BP6601 is a high-performance stepper motor driver with integrated microstepping capability up to 1/16 step. It features integrated power MOSFETs and advanced current control for smooth and precise motor operation.
This driver supports motor supply voltages from 8V to 35V and provides up to 2.5A peak current per phase. The adaptive decay mode and mixed decay current regulation ensure optimal torque and smooth motion.
The BP6601 can be controlled through simple step/direction inputs or serial interface for advanced configuration. Built-in protection features include over-current protection, thermal shutdown, and under-voltage lockout.
Product Series
BP
Primary Application
3D printers
Key Features
- Up to 1/16 microstepping resolution
- Integrated power MOSFETs
- Adaptive mixed decay mode
- Step/direction or serial control
- Current regulation and limiting
- Comprehensive protection features
Specifications
| Motor Supply Voltage | 8V-35V |
|---|---|
| Logic Supply Voltage | 3.3V-5V |
| Peak Current | 2.5A per phase |
| Continuous Current | 1.8A per phase |
| Microstepping | Full, 1/2, 1/4, 1/8, 1/16 |
| Rds(on) | 320mΩ (typ) |
| Package | TQFP-48 |
Applications
3D printers
Electronic system design
CNC machines
Electronic system design
Robotics
Electronic system design
Automated equipment
Electronic system design
Precision positioning
Electronic system design
FAE Expert Insights
"The BP6601 is an excellent stepper driver for precision motion control applications. The 1/16 microstepping capability provides smooth motion and reduced vibration compared to full-step operation. In my experience with 3D printer and CNC designs, the adaptive decay mode significantly improves torque stability at various speeds. The integrated MOSFETs with 320mΩ Rds(on) are suitable for most NEMA 17 and smaller NEMA 23 stepper motors. I particularly appreciate the simple step/direction interface which makes it easy to interface with microcontrollers and motion controllers. The current regulation is accurate and stable, preventing motor overheating. For higher current requirements, consider adding external MOSFETs or using higher-current drivers."
High-performance stepper driver with excellent microstepping for precision applications
— Brian Huang, BeiLuo
Frequently Asked Questions
What is microstepping and why is it important?
Microstepping divides each full step into smaller increments (1/2, 1/4, 1/8, 1/16, etc.), providing smoother motion, reduced vibration, and higher resolution. Benefits include: 1) Smoother motion at low speeds, 2) Reduced mechanical resonance and noise, 3) Finer position resolution, 4) Improved torque stability. The BP6601 supports up to 1/16 microstepping (3200 steps/revolution for 200-step motor). Higher microstepping provides smoother motion but requires higher step frequencies. For most applications, 1/8 or 1/16 microstepping provides good balance of smoothness and performance.
Use 1/8 or 1/16 microstepping for smooth motion. Contact LiTong for microstepping optimization guidance.
How do I set the motor current on BP6601?
Motor current is set using a current sense resistor and voltage reference. The formula is: Itrip = Vref / (8 × Rsense), where Vref is the reference voltage and Rsense is the sense resistor. For example, with 0.5Ω sense resistor and 1V reference: Itrip = 1 / (8 × 0.5) = 0.25A. The reference voltage can be set using a potentiometer or DAC for software-controlled current. Set current to motor rated current or slightly below to prevent overheating. Always start with lower current and increase gradually while monitoring motor temperature.
Set current to motor rated specification. Contact LiTong for current setting calculations.
What is decay mode and how does it affect performance?
Decay mode determines how current decreases in the motor winding when the PWM cycle turns off. Types: 1) Slow decay - current recirculates through driver, low ripple but slow current change, 2) Fast decay - current returns to supply, fast current change but high ripple, 3) Mixed decay - combines both for optimal performance. The BP6601 adaptive mixed decay automatically selects optimal decay based on current level. Proper decay mode selection improves torque stability and reduces motor noise. Mixed decay is recommended for most applications.
Use mixed decay mode for best performance. Contact LiTong for decay mode optimization.
How do I prevent stepper motor stall and missed steps?
Preventing stepper motor stall: 1) Proper current setting - set to motor rated current, 2) Acceleration ramping - use S-curve or trapezoidal acceleration profiles, 3) Load matching - ensure motor torque margin (typically 50% safety margin), 4) Microstepping - use higher microstepping for smoother motion, 5) Voltage - use higher supply voltage with current regulation for better torque at speed, 6) Mechanical - minimize friction and ensure smooth mechanical system. Missed steps often occur during acceleration or under high load conditions.
Implement acceleration ramping and verify torque margins. Contact LiTong for motion profile optimization.
What is the difference between bipolar and unipolar stepper motors?
Bipolar stepper motors have two coils with no center taps, requiring H-bridge drivers to reverse current direction. Unipolar motors have center-tapped coils allowing simpler driver circuits. Bipolar advantages: 1) Higher torque for same size (better copper utilization), 2) Simpler wiring (4 wires vs 6 or 8), 3) Better performance with microstepping. The BP6601 is designed for bipolar stepper motors using dual H-bridges. Most modern stepper applications use bipolar motors for better performance. The BP6601 cannot drive unipolar motors without modification.
Use bipolar stepper motors with BP6601 for best performance. Contact LiTong for motor selection guidance.