BA6846FS 데이터 시트보기 (PDF) - ROHM Semiconductor

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BA6846FS

Stepping motor driver

ROHM Semiconductor 

Motor driver ICs

FOperation notes

(1) Control logic pins

Do not apply voltage to control logic pins when the VCC

voltage is not applied to the IC. The voltage of each pin

should be less than VCC, if applied, 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 and the PGND pin. De-

pending 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 between the large current

output lines and the input section. Suppress the power

supply impedance to low levels, otherwise output oscilla-

tion may occur.

FElectrical characteristic curves

BA6846FS / BA6846FV

(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

The GND and SUB pins 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) Logic input pins

These pins have characteristics negatively correlated to

temperature. Give full consideration to the temperature

effect when using the IC.

745

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