Specification :

The HEF4752V is a circuit for a.c. motor speed control
utilizing LOCMOS technology. The circuit synthesizes
three 120° out of phase signals, of which the average
voltage varies sinusoidally with time in the frequency
range 0 to 200 Hz. The method employed is based upon
the pulse width modulation principle, in order to achieve a
sufficient accuracy of the output voltages over the whole
frequency range. A pure digital waveform generation is
used.
All outputs are of the push-pull type. Inputs and outputs are
protected against electrostatic effects in a wide variety of
device-handling situations. However, to be totally safe, it is
desirable to take handling precautions into account.