STK672-442BN-E

No.A2249-26/28

7. 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 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 damage in this case, connect a 10

 resistor to the VDD pin, or insert a diode between the VCC

decoupling capacitor C1 GND and the VDD 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 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.

BB

B

AB

A

R1

R2

VDD

GND

VDD=5V

4

5

3

1

VSS

2

9

18

MODE1

CLOCK

CWB

RESETB

Vref

S.G

C1

Vcc

open

24V

Reg

.

FAULT

6

ENABLE

MODE2

Overcurrent path

Overcurrent protection measure: insert a resistor

Overcurrent protection measure: insert a diode

MODE3

FAO

FABO

FBO

FBBO

A1

B1

Vref

5V

Reg.

.