STK672-622A-E Datasheet, PDF (21/23 Pages) Sanyo Semicon Device – Thick-Film Hybrid IC 2-phase Stepping Motor Driver

8. Other Notes on Use
STK672-622A-E
In addition to the “Notes” indicated in the Sample Application Circuit, care should also be given to the following
contents during use.
(1) Allowable operating range
Operation of this product assumes use within the allowable operating range. If a supply voltage or an input
voltage outside the allowable operating range is applied, an overvoltage may damage the internal control IC or
the MOSFET.
If a voltage application mode that exceeds the allowable operating range is anticipated, connect a fuse or take
other measures to cut off power supply to the product.
(2) Input pins
If the input pins are connected directly to the PC board connectors, electrostatic discharge or other overvoltage
outside the specified range may be applied from the connectors and may damage the product. Current generated
by this overvoltage can be suppressed to effectively prevent damage by inserting 100Ω to 1kΩ resistors in lines
connected to the input pins.
Take measures such as inserting resistors in lines connected to the input pins.
(3) Power connectors
If the motor power supply VCC is applied by mistake without connecting the GND part of the power connector
when the product is operated, such as for test purposes, an overcurrent flows through the VCC decoupling
capacitor, C1, to the parasitic diode between the VDD of the internal control IC and GND, and may damage the
power supply pin block of the internal control IC.
To prevent destruction in this case, connect a 10Ω resistor to the VDD pin, or insert a diode between the VCC
decoupling capacitor C1 GND and the VDD pin.
5V
Reg.
Overcurrent protection measure: Insert a resistor.
VDD=5V
9
MODE1
CLOCK
CWB
RESETB
ENABLE
MODE2
FAULT1
Vref
18 ^N.C
VDD
FAO
FABO
FBO
FBBO
AI
BI
Vref
VSS
A AB
4
5
F1 F2
B BB
3
1
F3 F4
VCC
R1
R2
C1
GND
2
24V
Reg.
6
open
Overcurrent protection measure: Insert a diode.
Over-current path
(4) Input Signal Lines
1) Do not use an IC socket to mount the driver, and instead solder the driver directly to the PC board to minimize
fluctuations in the GND potential due to the influence of the resistance component and inductance component
of the GND pattern wiring.
2) To reduce noise caused by electromagnetic induction to small signal lines, do not design small signal lines
(sensor signal lines, and 5V or 3.3V power supply signal lines) that run parallel in close proximity to the motor
output line A (Pin 4), AB (Pin 5), B (Pin 3), or BB (Pin 1) phases.
3) Pin 7 and Pin 11 of this product are N.C pins. Do not connect any wiring to these pins.
No. A1995-21/23