487

Motor driver ICs

BA6950FS

FCircuit operation

(1)

Control signals are input from these pins. Current flows

sults in the brake mode in which the high-side output

transistor is turned off to shut down the motor driving cur-

rent and the low-side output transistor is turned ON to ab-

sorb the counter-electromotive force of the motor, so that

LOW, both M1 and M2 are left open and the motor stops.

Input / output truth table

(2)

Output section (M1, M2)

Two logic inputs control the motor by changing the status

of bridge-configured transistors.

(3)

Output high level voltage

Values of current, voltage, and HIGH level output voltage

can be set as follows by using external resistors (refer to

the application circuit of Fig. 4).

R5/R4

V16 pin = R3

(I16 pin

)I15 pin))R2

I16 pin

V7, 9 pin = 4

V16 pin (Typ.)

(4)

Current feedback amplifier

The pin-8 current is increased when the motor rotational

speed is reduced by loading, and the current feedback

amplifier increases the pin-15 current according to equa-

rotational speed is kept constant by increasing the volt-

age applied to the motor.