430

Motor driver ICs

BA6285FS / BA6285FP

(5)

Large current line

Large currents are carried by the motor power supply and

motor ground for these ICs.

Therefore, the layout of the pattern of the PC board and

the constants of certain parameters for external compo-

nents, such as the capacitor between the power supply

and ground, may cause this large output current to flow

back to the input pins, resulting in output oscillation or

other malfunctions. To prevent this, make sure that the

PC board layout and external circuit constants cause no

problems with the characteristics of these ICs.

(6)

Power dissipation

The power dissipation will fluctuate depending on the

mounting conditions of the IC and the ambient environ-

ment. Make sure to carefully check the thermal design of

the application where these ICs will be used.

(7)

Power consumption

The power consumption by the IC varies widely with the

power supply voltage and the output current. Give full

consideration to the power dissipation rating and the

thermal resistance data and transient thermal resistance

data, to provide a thermal design so that none of the rat-

ings for the IC are exceeded.

(8)

ASO

Make sure that the output current and supply voltage do

not exceed the ASO values.

(9)

Precautions for input mode switching

To ensure reliability, it is recommended that the mode

switching for the motor pass once through the open

mode.

(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

exceed the voltage on the motor power supply pin or the

(13) The input and POWER SAVE pins have tempera-

ture-dependent characteristics. Take the temperature ef-

fect into consideration when using the IC.

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

tween OUT1 and GND and between OUT2 and GND. Al-

ternatively, connect a capacitor between OUT1 and

OUT2, and also a diode between OUT1 and GND and

between OUT2 and GND (see Fig. 11).

FElectrical characteristic curves