583

Motor driver ICs

BA6825FS / BA6826FS

(3)

Output waveforms are shown in Fig. 5. Because of

the amplifier offset, the output is left OPEN when the out-

put signal switches from positive to negative. The output

waveform is determined by the external circuit because

the IC impedance increases during this transition period.

Since inductive loads are usually provided, a capacitor

should be connected to suppress the backlash voltage.

FOperation notes

(1)

Ω resistor con-

nected in series. Current is limited only by the 500

Ω re-

sistor.

(2)

Hall input

Signals of 50mV (peak to peak) or greater should be ap-

plied to the Hall device input. The DC input range is be-

tween 2V and (Vreg

*1.5V). There will be no problem if

the input is centered around Vreg / 2.

Because the Hall input impedance is 1M

Ω or grater, any

type of Hall device can be connected. No current flows

when the transistor is off because the Hall input pins (

)

and

*) are differential.

Because the ICs are linear drivers, any DC offset in the

Hall device will be amplified and appear in the output.

Use Hall devices having a minimum offset. Hall devices

can be connected in either series or parallel.

(3)

Thermal shutdown circuit

The circuit puts the driver outputs (9, 11, 12, and 14 pin)

to the open state at the temperature of 175

_C (typical).

There is a temperature difference of about 20

_C between

the temperatures at which the circuit is activated and

deactivated.