739

Motor driver ICs

BA6845FS

FApplication example

FOperation notes

(1)

Control logic pins

Do not apply voltage to control logic pins (pins 4, 5, 12,

and should be more than the ground voltage.

(2)

PCB arrangement

When changing the rotational direction of a motor, a large

current of up to a few hundred milliamperes can flow be-

tween the motor power supply (pins 11 and 14) and

MGND (pins 1 and 8). Depending on the application, this

large output current may flow back to input pins, resulting

in output oscillation or other malfunctions. Make sure that

your design does not allow a common impedance be-

tween the large current output lines and the input section.

Suppress the power supply impedance to low levels,

otherwise output oscillation may occur.

(3)

Package power dissipation

The power dissipated by the IC varies widely with the

supply voltage and the output current. Give full consider-

ation to the package power dissipation rating when set-

ting the supply voltage and the output current.

(4)

Ground pins

Pins 1, 3, 6, and 8 should have the lowest potential

(ground potential) in the IC.

(5)

Thermal shutdown circuit

This circuit shuts down all the driver outputs when the

chip junction temperature is increased to about 175

_C

(typical). The thermal shutdown circuit is deactivated

when the temperature drops to about 20

_C (typical).

(6)

Input pins (pins 4, 5, 12, and 13)

These pins have characteristics negatively correlated to

temperature. Give full consideration to the temperature

effect when using the IC.