Overview
The STK672-050-E is a stepping motor driver hybrid IC produced by ON Semiconductor. It is designed to drive unipolar stepping motors and features a built-in microstepping controller based on a constant-current PWM system. This IC supports various excitation methods, including 2-phase, 1-2 phase, W1-2 phase, 2W1-2 phase, and 4W1-2 phase excitations, allowing for high motor torques, low vibration levels, low noise, fast response, and high-efficiency drive.
Key Specifications
| Parameter | Symbol | Conditions | Ratings | Unit |
|---|---|---|---|---|
| Maximum supply voltage 1 | VCC1 max | No signal | 52 V | V |
| Maximum supply voltage 2 | VCC2 max | No signal | -0.3 to +7.0 V | V |
| Phase output current | IOH max | 0.5 s, 1 puls, when VCC1 applied | 4.0 A | A |
| Repeatable avalanche energy | Ear max | 38 mJ | mJ | |
| Power loss | Pd max | θc-a = 0 | 25 W | W |
| Operating temperature | Tc max | 105 °C | °C | |
| Junction temperature | Tj max | 150 °C | °C | |
| Storage temperature | Tstg | -40 to +125 °C | °C | |
| Input voltage (Logic input pins) | VIN max | -0.3 to +7.0 V | V | |
| Input voltage (Vref pin) | VI | Pin 8 | 0 to 2.5 V | V |
| Output voltage (MOI, MO1, MO2) | VOH | I = –3 mA | 2.4 V | V |
| Output voltage (MOI, MO1, MO2) | VOL | I = +3 mA | 0.4 V | V |
Key Features
- Uses power MOSFETs in the output stage for low drive loss.
- Includes a built-in microstepping controller, supporting up to 1/16 step units.
- Supports five excitation methods: 2-phase, 1-2 phase, W1-2 phase, 2W1-2 phase, and 4W1-2 phase.
- External excitation PWM drive allows a wide operating supply voltage range (VCC1 = 10 to 45 V).
- Current detection resistor (0.2 Ω) built into the hybrid IC.
- Provides a motor output drive current of up to 3.0 A.
- CMOS Schmitt trigger structure for mode setting and reset functions.
- High motor torques, low vibration levels, low noise, fast response, and high-efficiency drive.
Applications
The STK672-050-E is suitable for various applications requiring precise and efficient stepping motor control, such as:
- Industrial automation systems.
- Medical equipment.
- Printers and plotters.
- Robotics and CNC machines.
- Other precision motion control systems.
Q & A
- What is the maximum supply voltage for VCC1?
The maximum supply voltage for VCC1 is 52 V.
- What is the maximum output current of the STK672-050-E?
The maximum phase output current (IOH) is 4.0 A.
- What are the supported excitation methods?
The STK672-050-E supports 2-phase, 1-2 phase, W1-2 phase, 2W1-2 phase, and 4W1-2 phase excitations.
- How is the motor current set?
The motor current IOH is set by the Vref voltage on the hybrid IC pin 8, using the formula IOH = (1/3) x Vref/Rs.
- What is the operating temperature range?
The operating temperature range is from -40°C to 105°C.
- What type of output stage does the STK672-050-E use?
The STK672-050-E uses power MOSFETs in the output stage.
- How many step units does the microstepping controller support?
The microstepping controller supports up to 1/16 step units.
- What is the function of the RESET pin?
The RESET pin resets all parts of the system to their initial values by setting it low for at least 10 µs.
- What is the purpose of the MOI, MO1, and MO2 pins?
The MOI, MO1, and MO2 pins output the current phase excitation state, with MOI indicating the origin state.
- How is the motor speed controlled?
The motor speed can be controlled with only a clock signal input into the CLK terminal.
