458

Motor driver ICs

BA6289F / BA6417F

(10) In-rush current

There are no circuits built into these ICs that prevent in-

rush currents. Therefore, it is recommended to place a

current limiting resistor or other physical countermea-

sure.

(11) Factors regarding the thermal, power supply, and

motor conditions

If the potential of the output pin sways greatly and goes

below the potential of ground, the operation of the IC may

malfunction or be adversely affected. In such a case,

place a diode between the output and ground, or other

measure, to prevent this.

(12) HIGH level output voltage setting pin

voltage :

input range over which the HIGH level output voltage can

be controlled according to the above equation is between

a low-impedance circuit. Set the voltage by either provid-

ing an impedance of about 10k

Ω or connecting a capaci-

impedance and capacitance values depend on such fac-

tors as the type of motor, the PCB pattern, and the load

current, the values must be determined separately for

each application.

(13) Thermal shutdown circuit

When the thermal shutdown circuit is activated at the IC

junction temperature of about 175

_C (typical), all driver

outputs are turned OFF. There is a temperature differ-

ence of about 15

_C (typical) between the temperatures

at which the circuit is activated and deactivated.

(13) The input pins (pins 4 and 5 have temperature de-

pendent characteristics. Take the temperature effect into

consideration when using the IC.

(14) To eliminate motor noise, connect a capacitor be-

tween OUT1 (pin 1) and GND and between OUT2 (pin 7)

and GND. Alternatively, connect a capacitor between

OUT1 and OUT2, and also a diode between OUT1 and

GND and between OUT2 and GND.