Overview
The STK672-440BN-E is a hybrid IC designed by onsemi for use as a unipolar, 2-phase stepper motor driver with PWM current control. This component is particularly suited for applications requiring precise motor control and robust protection features. It is widely used in office equipment such as photocopiers and printers.
Key Specifications
| Parameter | Symbol | Conditions | Ratings | Unit |
|---|---|---|---|---|
| Maximum supply voltage 1 | Vcc max | No signal | 50 | V |
| Maximum supply voltage 2 | VDD max | No signal | -0.3 to 6.0 | V |
| Input voltage | Vin max | Logic input pins | -0.3 to 6.0 | V |
| Output current 1 | IOP max | 10μs, 1 pulse (resistance load) | 20 | A |
| Output current 2 | IOH max | VDD = 5V, CLOCK ≥ 200Hz | 3.5 | A |
| Allowable power dissipation 1 | PdMF max | With an arbitrarily large heat sink | 8.3 | W |
| Allowable power dissipation 2 | PdPK max | No heat sink | 3.1 | W |
| Operating substrate temperature | Tcmax | 105 | °C | |
| Junction temperature | Tjmax | 150 | °C | |
| Storage temperature | Tstg | -40 to 125 | °C |
Key Features
- Built-in motor terminal open detection, overcurrent detection, and overheat detection functions with FAULT1 and FAULT2 signals for protection.
- Power on reset function to initialize internal IC operations when power is supplied.
- Micro-step sine wave-driven driver capability activated by an external clock.
- External pins for selecting various excitation modes (2, 1-2, W1-2, 2 W1-2, or 4W1-2).
- Rotational direction switching function and phase maintenance during excitation mode switching.
- Schmitt input for 2.5V high level input.
- Current detection resistor (0.122Ω) for setting motor current using external resistors.
- ENABLE pin to cut output current while maintaining the excitation mode.
- No motor sound during hold mode due to external excitation current control.
- PWM operation with constant current control and phase shifting of Ach Bch.
- Compatible pins with STK672-432BN/-442BN-E models.
Applications
The STK672-440BN-E is commonly used in various office equipment and industrial applications, including:
- Office photocopiers
- Printers
- Other devices requiring precise stepper motor control and robust protection features.
Q & A
- What is the primary function of the STK672-440BN-E?
The STK672-440BN-E is a hybrid IC designed for use as a unipolar, 2-phase stepper motor driver with PWM current control.
- What are the key protection features of the STK672-440BN-E?
The IC includes built-in motor terminal open detection, overcurrent detection, and overheat detection functions, with FAULT1 and FAULT2 signals for indicating these conditions.
- How is the motor current set in the STK672-440BN-E?
The motor current is set using the Vref input pin and two external resistors, with the Vref voltage range being 0.2V to 1.8V.
- What is the maximum output current of the STK672-440BN-E?
The maximum output current (IOH) is 3.5 A when VDD = 5V and CLOCK ≥ 200Hz.
- What is the operating substrate temperature range for the STK672-440BN-E?
The operating substrate temperature range is 0 to 105°C.
- Does the STK672-440BN-E support micro-step operation?
Yes, it can be activated by inputting an external clock to enable micro-step sine wave-driven operation.
- How does the ENABLE pin function in the STK672-440BN-E?
The ENABLE pin can be used to cut the output current while maintaining the excitation mode.
- What is the purpose of the FAULT1 and FAULT2 signals?
The FAULT1 signal outputs low when any of motor terminal open, overcurrent, or overheat is detected. The FAULT2 signal outputs the result of activation of protection circuit detection at three levels.
- Is the STK672-440BN-E still in production?
No, this product is no longer manufactured.
- What are the typical input voltage specifications for the logic input pins?
The input voltage specifications are VIH = 2.5V min and VIL = 0.8V max, with a hysteresis voltage of 0.3V.
