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PDF STK672-740A-E Data sheet ( Hoja de datos )
| Número de pieza | STK672-740A-E | |
| Descripción | Two-Phase Stepping Motor Driver | |
| Fabricantes | ON Semiconductor | |
| Logotipo |  |
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Ordering number : ENA1136B
STK672-740A-E
Thick-Film Hybrid IC
2-phase Stepping Motor Driver
http://onsemi.com
Overview
The STK672-740A-E is a hybrid IC for use as a unipolar, 2-phase stepping motor driver with PWM current control.
Applications
• Office photocopiers, printers, etc.
Features
• Built-in overcurrent detection function (output current OFF).
• Built-in overheat detection function (output current OFF).
• If either overcurrent or overheat detection function is activated, the FAULT signal (active low) is output.
• Built-in power on reset function.
• Phase signal input driver activated with an active Low and incorporates a simultaneous ON prevention function.
• Supports schmitt input for 2.5V high level input.
• Incorporating a current detection resistor (0.089Ω: resistor tolerance ±2%), motor current can be set using two
external resistors.
• Provides the output current cutoff ENABLE pin.
Semiconductor Components Industries, LLC, 2013
June, 2013
70611HKPC 018-10-0049/21611HKIM/71608HKIM No. A1136-1/19
1 page  
Precautions
STK672-740A-E
[GND wiring]
• To reduce noise on the 5V system, be sure to place the GND of C01 in the circuit given above as close as possible to
Pin 2 and Pin 6 of the hybrid IC. Also, to achieve accurate current settings, be sure to connect Vref GND to Pin 18
(S.G) used to set the current and to the point where P.G1 and P.G2 share a connection.
[Input pins]
• If VDD is being applied, use care that each input pin does not apply a negative voltage less than -0.3V to S.G, Pin 18,
and do not apply a voltage greater than or equal to VDD voltage.
• Do not wire by connecting the circuit pattern on the P.C.B side to Pins 4, 8, or 11 on the N.C. shown in the internal
block diagram.
• Apply 2.5V High level input to pins 13, 17, 12, 10, 14, and 15.
• Since the input pins do not have built-in pull-up resistors, when the open-collector type pins 13, 17, 12, 10, 14, and 15
are used as inputs, a 1 to 20kΩ pull-up resistor (to VDD) must be used.
At this time, use a device for the open collector driver that has output current specifications that pull the voltage down
to less than 0.8V at Low level (less than 0.8V at Low level when IOL=5mA).
[Current setting Vref]
• Considering the specifications of the Vref input bias current, IIB, a value of 1kΩ or less is recommended for R02.
• If the motor current is temporarily reduced, the circuit given below (STK672-740A-E: IOH>0.3A) is recommended.
5V 5V
R01
Vref
R3 R02
R01
Vref
R3
R02
• Motor current peak value IOH setting
IOH
0
IOH=(Vref ÷ 4.9) ÷ Rs
The value of 4.9 in Equation above represents the Vref voltage as divided by a circuit inside the control IC.
Vref=(R02 ÷ (R01+R02))×5V(or 3.3V)
Rs is an internal current detection resistor value of the hybrid IC.
STK672-740A-E: Rs=0.089Ω
No. A1136-5/19
5 Page 
STK672-740A-E
2. Overcurrent Detection and Overheat Detection Functions of the STK672-740A-E
Each detection function operates using a latch system and turns output off. Because a RESET signal is required to
restore output operations, once the power supply, VDD, is turned off, you must either again apply power on reset with
VDDON or apply a RESETB=High→Low→High signal.
[Overcurrent detection]
This hybrid IC is equipped with a function for detecting overcurrent that arises when the motor burns out or when there
is a short between the motor terminals.
Overcurrent detection occurs at 5.5A typ with the STK672-740A-E
Set motor
current,
IOH
Current when motor terminals are shorted
PWM period
MOSFET all OFF
Over-current detection
IOHmax
No detection interval
(5.5μs typ)
Normal operation
5.5μs typ
Operation when motor pins are shorted
Overcurrent detection begins after an interval of no detection (a dead time of 5.5μs typ) during the initial ringing part
during PWM operations. The no detection interval is a period of time where overcurrent is not detected even if the
current exceeds IOH.
[Overheat detection]
Rather than directly detecting the temperature of the semiconductor device, overheat detection detects the temperature
of the aluminum substrate (144°C typ).
Within the allowed operating range recommended in the specification manual, if a heat sink attached for the purpose of
reducing the operating substrate temperature, Tc, comes loose, the semiconductor can operate without breaking.
However, we cannot guarantee operations without breaking in the case of operations other than those recommended,
such as operations at a current exceeding IOH max that occurs before overcurrent detection is activated.
No. A1136-11/19
11 Page | ||
| Páginas | Total 19 Páginas | |
| PDF Descargar | [ Datasheet STK672-740A-E.PDF ] | |
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