STK672-732AN-E
www.onsemi.com
24
8. Other usage notes
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 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 100 to 1k 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 V
CC
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 V
CC
decoupling capacitor,
C1, to the parasitic diode between the V
DD
of the internal control IC and GND, and may damage the power supply
pin block of the internal control IC.
To prevent damage in this case, connect a 10 resistor to the V
DD
pin, or insert a diode between the V
CC
decoupling capacitor C1 GND and the V
DD
pin.
(4) Input Signal Lines
1) Do not use an IC socket to mount the driver, and instead solder the driver directly to the 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 5 V or 3.3 V power supply signal lines) that run parallel in close proximity to the motor output line
A (Pin 5), AB (Pin 7), B (Pin 3), or BB (Pin 1) phases.
BB
B
AB
A
R1
R2
VDD
GND
VDD=5V
5 7
3 1
VSS
2
9
ΦA
ΦAB
ΦB
ΦBB
Vref
S.G
C1
Vcc
open
24V
Reg
.
FAULT
6
ENABLE
RESETB
Overcurrent path
Overcurrent protection measure: insert a resistor
Overcurrent protection measure: insert a diode
FAO
FABO
FBO
FBBO
AI
BI
Vref
5V
Reg.
.
