600

Motor driver ICs

BA6970FS

(3)

Output waveforms are shown in Fig. 9. 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 backlash voltages.

FOperation notes

(1)

10.

(2)

Hall input

Hall input signals of 50mV (peak to peak) or greater

should be applied between pins 9 and 10 and between

pins 11 and 12. The DC input range is 2V to

(Vreg

*1.5V). There will be no problem if the input is cen-

tered 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 pins 9 and 10 as well

as pins 11 and 12 are differential inputs.

Because the IC is a linear driver, 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.

Fig.9

Fig.10

Fig.11