Overview
The STK672-640AN-E is a hybrid IC designed for use as a unipolar, 2-phase stepper motor driver with PWM current control. It is manufactured by onsemi and features a built-in controller based on a unipolar constant-current PWM system. This IC supports application simplification and standardization by providing a built-in 4-phase distribution stepping motor controller. It allows for the control of the basic stepping angle of the stepper motor divided into 1/2 step units and enables motor speed control using only an external clock signal. The STK672-640AN-E is designed to implement systems with 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 | VCC max | No signal | 52 | 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 | 4.0 | A |
| Allowable power dissipation 1 | PdMF max | With an arbitrarily large heat sink. Per MOSFET | 8.3 | W |
| Allowable power dissipation 2 | PdPK max | No heat sink | 3.1 | W |
| Operating substrate temperature | Tcmax | 105 | °C |
Key Features
- Built-in overcurrent detection function and overheat detection function (output current OFF).
- FAULT signal (active low) is output when overcurrent or overheat is detected.
- Built-in power on reset function.
- Motor speed controlled by the frequency of an external clock signal.
- 2 phase or 1-2 phase excitation switching function, with phase maintained even when the excitation mode is switched.
- Rotational direction switching function.
- Supports schmitt input for 2.5V high level input.
- Incorporating a current detection resistor (0.089Ω: resistor tolerance ±2%), allowing motor current to be set using two external resistors.
- The ENABLE pin can be used to cut output current while maintaining the excitation mode.
- Wide current setting range to reduce power consumption during standby.
- No motor sound generated during hold mode due to external excitation current control.
Applications
- Office photocopiers and printers.
- Computing and peripherals.
- Industrial applications.
- Multi-function printers and document scanners.
- Vending machines.
Q & A
- What is the STK672-640AN-E used for?
The STK672-640AN-E is used as a unipolar, 2-phase stepper motor driver with PWM current control.
- What are the key features of the STK672-640AN-E?
Key features include built-in overcurrent and overheat detection, power on reset, and the ability to control motor speed with an external clock signal.
- What are the typical applications of the STK672-640AN-E?
Typical applications include office photocopiers, printers, computing and peripherals, industrial applications, multi-function printers, and vending machines.
- How does the overcurrent detection function work?
Overcurrent detection occurs at 5.5A typ and begins after a dead time of 5.5μs during PWM operations. It operates using a latch system and turns output off when detected.
- How does the overheat detection function work?
Overheat detection detects the temperature of the aluminum substrate (144°C typ) and turns output off when the temperature exceeds this limit.
- What is the maximum supply voltage for the STK672-640AN-E?
The maximum supply voltage (VCC max) is 52V, and the maximum supply voltage (VDD max) is -0.3 to 6.0V.
- How is the motor speed controlled?
The motor speed is controlled by the frequency of an external clock signal.
- What is the purpose of the ENABLE pin?
The ENABLE pin can be used to cut output current while maintaining the excitation mode.
- What package type does the STK672-640AN-E come in?
The STK672-640AN-E comes in a 19-pin SIP (Single In-Line Package) module.
- Is the STK672-640AN-E still in production?
The STK672-640AN-E is listed as obsolete, indicating it is no longer in active production.
