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FMD 2440A stepper motor driver:, it is good quanlity and competive price, it is fit for NEMA23 stepping motor - details see: https://www.machineto.com/new-products-fmd2440a-stepper-motor-driver-4a-10234793

Package include:

• 1x FMD2440A Stepper Motor Driver

• 
  FMD2440A stepper motor driver
• 
  1.Brief introduction
  FMD2440A is using TB6600 chip produced by Japan's Toshiba, multiple optimize R &
  D and production of high-subdivision 2-phase stepper motor drive, suitable for driving
  small and medium-sized phase current is less than 4A 2-phase or 4-phase hybrid
  stepping motor. Due to the adoption of the new bipolar constant current chopper drive
  technology, using the same motor can output more speed and power than other
  drivers. The segmentation function make the stepper motor accuracy improved,
  reduces vibrations and noise reduction.
• 
  2.Features
  1. High-performance, low price
• 2. Bipolar constant current chopping mode
  3. Power supply voltage 12 to 40VDC
• 4. High-speed optocoupler signal isolation
  5.20kHz chopping frequency
• 6.Subdivision precision 1 \ 2 \ 4 \ 8 \ 16 optional
  7.Electrical input signal is TTL compatible
• 8. Stationary current is automatically reduced by half
  9.Shape design is convenient for installation
• 10.Maximum drive current 4A
  11. Drive any the 4A phase current of 2-phase or 4-phase hybrid stepping motor.
• 
  3.Applications
  Suitable for a variety of small and medium-sized automation equipment and
  instruments , for example: Small engraving machine, SMT machine, etc.

• 4.wiring defined

  Weak signal interface

  Signal	Function
  SP+	Pulse signal + end
  SP-	Pulse signal - end
  DIR+	Direction signal +end
  DIR-	Direction signal-end
  EN+	Enable signal +end
  EN-	Enable signal -end

  Strengths connection port

  Signal	Function
  VIN+	12to 40 v dc power supply input +end,it is recommended to use 24V3A
  GND	DC power supply connection ground
  A+	Stepper motor A + Phase terminal
  A-	Stepper motor A - Phase terminal
  B+	Stepper motor B+Phase terminal
  B-	Stepper motor B - Phase terminal

  NOTE:This drive does not contain anti-anti-interpolation circuit so non-input positive and negative power supply upside down! Otherwise it will damage the drive!

• 5.The electrical characteristics

  Electrical Characteristics (T = 25 ° C)

  Introductions	FMD2440
  	Min	Type	Max	Unit
  Output phase current	0.5	-	4	A
  Input power voltage	12	36	50	V
  Logic input voltage	3	5	7	V
  Logic input current	5	10	15	mA
  Stepper motor pulse frequency	0	-	150	KHz
  Minimum pulse time	5	-	-	us

  6.The use of the environment and parameters

  Cooling method		Natural cooling or forced air cooling
  Use of the environment	Occasions	Avoid dust, oil mist and corrosive gases
  	Temperature	0°C-+50°C
  	Humidity	40-90%RH
  	Vibration	6m/s2 MAX
  Storage temperature		-20°C-+65°C
  Weight		250g

  7.Mechanical installation size

• 8.Power supply
  The supply voltage can work normally in between DC12V-40V, FMD2440A driver can
  use ordinary switch DC power supply, can also be used for transformer and the bridge
  rectifier and filter capacitor, capacitance desirable 2000U to 5000U. Note rectified
  voltage ripple crest does not exceed 40V.Recommended the user to use the 24V-32V
  DC supply , avoid the grid fluctuations over drive voltage operating range.
• 
  Note:1, Wiring should pay attention to the power of positive and negative Do not be
  reversed;
  2, In order to reduce costs, multiple drives can share a power supply. But it should improve
  the rated power and rated output current of the power and attention to cooling.
• 9.Reset mode DIP switch settings
  Reset mode: SW1: ON = automatic; OFF = lock;

• 10.Subdivision DIP switch settings

• 11.The current DIP switch settings

• 11,Motor ,driver ont

• 12.Electrical wiring
  The FMD2440A driver can drive all current 4A 4-wire, 6-wire or 8-wire 2-phase / 4-phase
  motors, are detailed below 4-wire, 6-wire, 8 wire stepper motor connection:
• 13.Matching of the drive and motor
  FMD2440A driver can drive the domestic and foreign manufacturers of 2-phase or
  4-phase motor, in order to obtain the most satisfactory driving, you need to choose a
  reasonable supply voltage and current setting. Supply voltage determines the level of
  the high-speed performance of the motor, and the current set value determines the
  output torque of the motor.
• 
  Supply voltage selected
  Generally speaking, the higher the supply voltage, the greater the torque motor at high
  speed, the more it can avoid the high speed out. But another aspect, the voltage is too
  high will lead to over-voltage protection, and can even damage the drive, but also in the
  high-pressure work, low speed vibrations.
• 
  The output current is set
  For the same motor, the greater the current setting, the higher speed, the current motor
  and drive more heat. So under normal circumstances the current setting into a powered
  machine warm but not too hot long-term value.
• 
  Note:the current settings after you run the motor for 15-30 minutes, if the motor temperature
  is too high, you should reduce the current settings. If the motor current setting, the motor
  output torque is not enough to improve heat dissipation conditions to ensure that the motor
  and drive are not hot.