BA6970 查看數據表（PDF） - ROHM Semiconductor

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BA6970

2-phase motor driver for VCR cylinder motors

ROHM Semiconductor 

Motor driver ICs

(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) ECV input (pin 22)

The ECV input is plotted against the output current in Fig.

10.

(2) Hall input

Fig.10

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 1MΩ 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.

600

BA6970FS

Fig.9

Fig.11

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