TA7712P/PG/F/FG

2007-9-11

5

APPLICATIONS OF THE TA7712P/PG, TA7712F/FG

The TA7712P/PG and TA7712F/FG are provided with a stop function, which enables them to stop the motor having

a large inertia like a video disk player in a short time, so that disks can be changed quickly.

To eliminate the need of the frequency generator (FG), which was conventionally required for generating the

rotation signal, signals from the position sensor input are ORed and its synthesized signal is sent out from the

times that of each position sensor signal. This enables the TA7712P/PG and TA7712F/FG to achieve sufficient

control characteristics even with the F-V (frequency to voltage) convertor using a monostable multivibrator (MMV).

The difference between them and the TA7713P/PG is that the stop function is automated in the TA7713P/PG, while

it is operated by the external signal in the TA7712P/PG.

The following sections describe the applications of the TA7713P/PG.

Q1 and Q2 in Figure 1 comprise a monostable multivibrator. The position sensor input signals, Ha, Hb and Hc,

are combined together and applied to the base of Q2 after squaring waveform with a flip-flop, FF.

six times the frequency of each position sensor signal. (Six pulses per electrical revolution)

output signal.

Figure 1

POSITION SENSOR