Ordering number : ENA2248A
STK672-440BN-E
Thick-Film Hybrid IC
2-phase Stepper Motor Driver
http://onsemi.com
Overview
The STK672-440BN-E is a hybrid IC for use as a unipolar, 2-phase stepper motor driver with PWM current control.
Applications
Office photocopiers, printers, etc.
Features
Built-in motor terminal open detection function, overcurrent detection function, overheat detection function
(output current OFF).
FAULT1 signal (active low) is output when any of motor terminal open, overcurrent or overheat is detected.
The FAULT2 signal is used to output the result of activation of protection circuit detection at 3 levels.
Built-in power on reset function.
A micro-step sine wave-driven driver can be activated merely by inputting an external clock.
External pins can be used to select 2, 1-2 (including pseudo-micro), W1-2, 2 W1-2, or 4W1-2 excitation.
The switch timing of the 4-phase distributor can be switched by setting an external pin (MODE3) to detect either the
rise and fall, or rise only, of CLOCK input.
Phase is 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 (0.122Ω: resistor tolerance 2%), motor current can be set using two
external resistors.
The ENABLE pin can be used to cut output current while maintaining the excitation mode.
With a wide current setting range, power consumption can be reduced during standby.
No motor sound is generated during hold mode due to external excitation current control.
PWM operation is separately excited system. As for PWM phase the constant current control
which shifts the phase of Ach Bch.
Supports compatible pins with STK672-432BN/-442BN-E.
Specifications
Absolute Maximum Ratings at Tc = 25C
Ratings
Unit
Maximum supply voltage 1
Parameter
Vcc max
Symbol
No signal
Conditions
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
Output current 3
IOF max
16pin Output current
10
mA
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
Junction temperature
Tjmax
150
°C
Storage temperature
Tstg
40 to 125
°C
Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the Recommended Operating
Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect device reliability.
ORDERING INFORMATION
See detailed ordering and shipping information on page 28 of this data sheet.
Semiconductor Components Industries, LLC, 2014
January, 2014 Ver. 2.0
10714HK/D0413HK 018-13-0053 No.A2248-1/28
